Method and apparatus for the reception and demodulation of spread spectrum radio signals

Claim 2

A spread spectrum receiver for demodulating a spread spectrum signal having a concatenated sequence of shortened chip codes, extended chip codes and normal chip codes, comprising: means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means coupled to said receiving means for repetitively sampling the in-phase signal, thereby generating a plurality of in-phase samples; second means coupled to said receiving means for repetitively sampling the quadrature-phase signal, thereby generating a plurality of quadrature-phase samples; correlator means coupled to said first sampling means and to said second sampling means and responsive to a normal correlator chip code for correlating the plurality of in-phase samples with the normal correlator chip code to generate an in-phase correlation signal, for correlating the plurality of quadrature-phase samples with the normal correlator chip code to generate a quadrature-phase correlation signal, and for generating an output correlation signal from a square root of a sum of the square of the in-phase correlation signal plus the square of the quadrature-phase correlation signal; means coupled to said correlator means for acquiring and tracking the output correlation signal for generating a reference timing signal; and means coupled to said correlator means and to said acquiring and tracking means and responsive to comparing the output correlation signal with the reference timing signal, for detecting the timing of the output correlation signal with respect to the reference timing signal, thereby detecting shortened chip codes, extended chip codes and normal chip codes of the spread spectrum signal.

Claim 3

The spread spectrum receiver as set forth in claim 1 wherein: said first sampling means samples the in-phase signal at twice a chip rate of the spread spectrum signal to generate the plurality of in-phase samples; and said second sampling means samples the quadrature-phase signal at twice a chip rate of the spread spectrum signal to generate the plurality of quadrature-phase samples.

Claim 4

The spread spectrum receiver as set forth in claim 1 wherein: said first sampling means samples the in-phase signal at n greater than 1 times a chip rate of the spread spectrum signal to generate the plurality of in-phase samples; and said second sampling means samples the quadrature-phase signal at n greater than 1 time a chip rate of the spread spectrum signal to generate the plurality of quadrature-phase samples.

Claim 5

A spread spectrum receiver for demodulating a spread spectrum signal comprising: means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means coupled to said receiving means for repetitively sampling the in-phase signal at twice a chip rate of the spread spectrum signal and separating the two samples per chip of the spread spectrum signal into a first sequence of in-phase samples and a second sequence of in-phase samples; second means coupled to said receiving means for repetitively sampling the quadrature phase signal at twice the chip rate of the spread spectrum signal and separating the two samples per chip of the spread spectrum signal into a first sequence of quadrature-phase samples and a second sequence of quadrature-phase samples; first correlating means coupled to said first sampling means and responsive to when the first sequence of in-phase samples are identical to a first plurality of 1-bit code chips for generating a first correlation signal; second correlating means coupled to said first sampling means and responsive to when the second sequence of in-phase samples are identical to the first plurality of 1-bit code chips for generating a second correlation signal; third correlating means coupled to said second sampling means and responsive to when the first sequence of quadrature phase samples are identical to a second plurality of 1-bit code chips for generating a third correlation signal; fourth correlating means coupled to said second sampling means and responsive to when the second sequence of quadrature phase samples are identical to the second plurality of 1-bit code chips for generating a fourth correlation signal; and means coupled to said first correlating means, said second correlating means, said third correlating means, and said fourth correlating means for squaring the first correlating signal, for squaring the second correlation signal, for squaring the third correlation signal, and for squaring the fourth correlation signal, and adding the squared first, second, third, and fourth correlation signals.

Claim 6

A spread spectrum receiver for demodulating a spread spectrum signal comprising: means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means coupled to said receiving means for repetitively sampling the in-phase signal at twice a chip rate of the spread spectrum signal and separating the two samples per chip of the spread spectrum signal into a first sequence of in-phase samples and a second sequence of in-phase samples; second means coupled to said receiving means for repetitively sampling the quadrature phase signal at twice the chip rate of the spread spectrum signal and separating the two samples per chip of the spread spectrum signal into a first sequence of quadrature-phase samples and a second sequence of quadrature-phase samples; first correlating means coupled to said first sampling means and responsive to when the first sequence of in-phase samples are identical to a first plurality of 1-bit code chips for generating a first correlation signal; second correlating means coupled to said first sampling means and responsive to when the second sequence of in-phase samples are identical to the first plurality of 1-bit code chips for generating a second correlation signal; third correlating means coupled to said second sampling means and responsive to when the first sequence of quadrature phase samples are identical to a second plurality of 1-bit code chips for generating a third correlation signal; fourth correlating means coupled to said second sampling means and responsive to when the second sequence of quadrature phase samples are identical to the second plurality of 1-bit code chips for generating a fourth correlation signal; and means coupled to said first correlating means, said second correlating means, said third correlating means, and said fourth correlating means for squaring the first correlating signal, for squaring the second correlation signal, for squaring the third correlation signal, and for squaring the fourth correlation signal, and adding the squared first, second, third, and fourth correlation signals.

Claim 7

A spread spectrum receiver for demodulating a spread spectrum signal comprising: means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase; first means for repetitively sampling the in-phase signal at n greater than 1 times a chip rate of the spread spectrum signal and separating the n samples per chip of the spread spectrum signal into a plurality of sequences of in-phase samples; second means for repetitively sampling the quadrature-phase signal at n greater than 1times a chip rate of the spread spectrum signal and separating the n samples per chip of the spread spectrum signal into a plurality of sequences of quadrature-phase samples; a first plurality of correlating means responsive to when the plurality of sequences of in-phase samples are identical to a first plurality of 1-bit code chips for generating a first plurality of correlation signals; a second plurality of correlating means responsive to when the plurality of sequences of quadrature-phase samples are identical to a second plurality of 1-bit code chips for generating a second plurality of correlation signals; and means responsive to the first plurality of correlation signals for squaring each of the first plurality of correlation signals, responsive to the second plurality of correlation signals for squaring each of the second plurality of correlation signals, and for adding each of the squared first plurality of correlation signals and the squared second plurality of correlation signals.

Claim 8

A spread spectrum receiver for demodulating a spread spectrum signal comprising: means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase; first means for repetitively sampling the in-phase signal at n greater than 1 times a chip rate of the spread spectrum signal and separating the n samples per chip of the spread spectrum signal into a plurality of sequences of in-phase samples; second means for repetitively sampling the quadrature-phase signal at n greater than 1times a chip rate of the spread spectrum signal and separating the n samples per chip of the spread spectrum signal into a plurality of sequences of quadrature-phase samples; a first plurality of correlating means responsive to when the plurality of sequences of in-phase samples are identical to a first plurality of 1-bit code chips for generating a first plurality of correlation signals; a second plurality of correlating means responsive to when the plurality of sequences of quadrature-phase samples are identical to a second plurality of 1-bit code chips for generating a second plurality of correlation signals; and means responsive to the first plurality of correlation signals for squaring each of the first plurality of correlation signals, responsive to the second plurality of correlation signals for squaring each of the second plurality of correlation signals, and for adding each of the squared first plurality of correlation signals and the squared second plurality of correlation signals.

Claim 15

A spread spectrum receiver for demodulating a spread spectrum signal having a sequence of concatenated first and second chip codes, comprising: receiver means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means for repetitively sampling the in-phase signal, thereby generating a plurality of in-phase samples; second means for repetitively sampling the quadrature-phase signal, thereby generating a plurality of quadrature-phase samples; first correlator means for correlating the in-phase samples and the quadrature-phase samples with a first correlator chip code to generate a first correlation signal; second correlator means for correlating the in-phase samples and the quadrature-phase samples with a second correlator chip code, thereby generating a second correlation signal; means for acquiring and tracking the first correlation signal and the second correlation signal, thereby generating a reference signal; and means responsive to the timing from the reference signal for detecting the first correlation signal and responsive to the timing from the reference signal for detecting the second correlation signal.

Claim 16

A spread spectrum receiver for demodulating a spread spectrum signal having a sequence of concatenated first and second chip codes, comprising: receiver means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means for repetitively sampling the in-phase signal, thereby generating a plurality of in-phase samples; second means for repetitively sampling the quadrature-phase signal, thereby generating a plurality of quadrature-phase samples; first correlator means for correlating the in-phase samples and the quadrature-phase samples with a first correlator chip code to generate a first correlation signal; second correlator means for correlating the in-phase samples and the quadrature-phase samples with a second correlator chip code, thereby generating a second correlation signal; means for acquiring and tracking the first correlation signal and the second correlation signal, thereby generating a reference signal; and means responsive to the timing from the reference signal for detecting the first correlation signal and responsive to the timing from the reference signal for detecting the second correlation signal.

Claim 17

The spread spectrum receiver as set forth in claim 9 wherein: said first sampling mean samples the in-phase signal with at least twice a chip rate of the spread spectrum signal and adds, for a plurality of chips of the in-phase signal, at least two samples per chip to generate the plurality of in-phase samples; and said second sampling mean samples the quadrature-phase signal with at least twice a chip rate of the spread spectrum signal and adds, for a plurality of chips of the quadrature-phase signal, at least two samples per chip to generate the plurality of quadrature-phase samples.

Claim 18

The spread spectrum receiver as set forth in claim 9 wherein: said first sampling means samples the in-phase signal at n greater than 1 times a chip rate of the spread spectrum signal to generate the plurality of in-phase samples; and said second sampling means samples the quadrature-phase signal at n greater than 1 times a chip rate of the spread spectrum signal to generate the plurality of quadrature-phase samples.

Claim 19

A spread spectrum receiver for demodulating a spread spectrum signal having a sequence of concatenated first, second, third and fourth chip codes, comprising: receiver means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means for repetitively sampling the in-phase signal, thereby generating a plurality of in-phase samples; second means for repetitively sampling the quadrature-phase signal, thereby generating plurality of quadrature-phase samples, first correlator means for correlating the in-phase samples and the quadrature-phase samples with a first correlator chip code, thereby generating a first correlation signal; second correlator means for correlating the in-phase samples and the quadrature phase samples with a second correlator chip code, thereby generating a second correlation signal; third correlator means for correlating the in-phase samples and the quadrature-phase samples with a third correlator chip code, thereby generating a third correlation signal; fourth correlator means for correlating the in-phase samples and the quadrature-phase samples with a fourth correlator chip code, thereby generating a fourth correlation signal; means for acquiring and tracking the first correlation signal, the second correlation signal, the third correlation signal and the fourth correlation signal, thereby generating a reference signal; and means responsive to the reference signal for detecting the first correlation signal, the second correlation signal, the third correlation signal and the fourth correlation signal, respectively, and for outputting a first data symbol, a second data symbol, a third data symbol or a fourth data symbol, corresponding to the first, second, third or fourth correlation signal having a greatest value, respectively.

Claim 20

A spread spectrum receiver for demodulating a spread spectrum signal having a sequence of concatenated first, second, third and fourth chip codes, comprising: receiver means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means for repetitively sampling the in-phase signal, thereby generating a plurality of in-phase samples; second means for repetitively sampling the quadrature-phase signal, thereby generating plurality of quadrature-phase samples, first correlator means for correlating the in-phase samples and the quadrature-phase samples with a first correlator chip code, thereby generating a first correlation signal; second correlator means for correlating the in-phase samples and the quadrature phase samples with a second correlator chip code, thereby generating a second correlation signal; third correlator means for correlating the in-phase samples and the quadrature-phase samples with a third correlator chip code, thereby generating a third correlation signal; fourth correlator means for correlating the in-phase samples and the quadrature-phase samples with a fourth correlator chip code, thereby generating a fourth correlation signal; means for acquiring and tracking the first correlation signal, the second correlation signal, the third correlation signal and the fourth correlation signal, thereby generating a reference signal; and means responsive to the reference signal for detecting the first correlation signal, the second correlation signal, the third correlation signal and the fourth correlation signal, respectively, and for outputting a first data symbol, a second data symbol, a third data symbol or a fourth data symbol, corresponding to the first, second, third or fourth correlation signal having a greatest value, respectively.

Claim 21

The spread spectrum receiver as set forth in claim 12 wherein: said first sampling means samples the in-phase signal at twice a chip rate of the spread spectrum signal to generate the plurality of in-phase samples; and said second sampling means samples the quadrature-phase signal at twice a chip rate of the spread spectrum signal to generate the plurality of quadrature-phase samples.

Claim 22

The spread spectrum receiver as set forth in claim 12 wherein: said first sampling means samples the in-phase signal at n greater than 1 times a chip rate of the spread spectrum signal to generate the plurality of in-phase samples; and said second sampling means samples the quadrature-signal at n greater than 1 times a chip rate of the spread spectrum signal to generate the plurality of quadrature-phase samples.

Claim 23

A spread spectrum receiver for demodulating a spread spectrum signal having a concatenated sequence of a plurality of chip codes, comprising: receiver means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means for repetitively sampling the in-phase signal, thereby generating a plurality of in-phase samples; second means for repetitively sampling the quadrature-phase signal, thereby generating plurality of quadrature-phase samples, correlator means for correlating the in-phase samples and the quadrature-phase samples with a plurality of correlator chip codes, respectively, thereby generating a plurality of correlation signals, respectively; acquiring and tracking means responsive to the plurality of correlation signals for generating a reference signal; and means responsive to the reference signal, for detecting the plurality of correlation signals and outputting one of a plurality of data symbols, corresponding to the correlation signal having a greatest value, respectively.

Claim 24

A spread spectrum receiver for demodulating a spread spectrum signal having a concatenated sequence of a plurality of chip codes, comprising: receiver means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means for repetitively sampling the in-phase signal, thereby generating a plurality of in-phase samples; second means for repetitively sampling the quadrature-phase signal, thereby generating plurality of quadrature-phase samples, correlator means for correlating the in-phase samples and the quadrature-phase samples with a plurality of correlator chip codes, respectively, thereby generating a plurality of correlation signals, respectively; acquiring and tracking means responsive to the plurality of correlation signals for generating a reference signal; and means responsive to the reference signal, for detecting the plurality of correlation signals and outputting one of a plurality of data symbols, corresponding to the correlation signal having a greatest value, respectively.

Claim 25

The spread spectrum receiver as set forth in claim 15 wherein: said first sampling means samples the in-phase signal at twice a chip rate of the spread spectrum signal to generate the plurality of in-phase samples; and said second sampling means samples the quadrature-phase signal at twice a chip rate of the spread spectrum signal to generate the plurality of quadrature-phase samples.

Claim 26

The spread spectrum receiver as set forth in claim 15 wherein: said first sampling means samples the in-phase signal at n greater than 1 times a chip rate of the spread spectrum signal to generate the plurality of in-phase samples; and said second sampling means samples the quadrature-phase signal at n greater than 1 times a chip rate of the spread spectrum signal to generate the plurality of quadrature-phase samples.

Claim 27

A spread spectrum receiver for demodulating a spread spectrum signal having a sequence of concatenated first and second chip codes, comprising: receiver means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means for repetitively sampling the in-phase signal at twice a chip rate of the spread spectrum signal and for generating, from first and second samples per chip of the in-phase signal, a first plurality of in-phase samples and a second plurality of in-phase samples, respectively; second means for repetitively sampling the quadrature-phase signal at twice a chip rate of the spread spectrum signal and for generating, from first and second samples per chip of the quadrature-phase signal, a first plurality of quadrature-phase samples and a second plurality of quadrature-phase samples, respectively; first correlator means for correlating the first plurality of in-phase samples of the first plurality of quadrature-phase samples with a first correlation chip code, for generating a first in-phase correlation signal and a first quadrature-phase correlation signal, respectively, and for generating a first output correlation signal from a square root of a sum of the square of the first in-phase correlation signal plus the square of the first quadrature-phase correlation signal; second correlator means for correlating the second plurality of in-phase samples and the second plurality of quadrature-phase samples with the first correlator chip code, for generating a second in-phase correlation signal and a second quadrature-phase correlation signal, respectively, and for generating a second output correlation signal from a square root of a sum of the square of the second in-phase correlation signal plus the square of the second quadrature-phase correlation signal; third correlator means for correlating the first plurality of in-phase samples and the first plurality of quadrature of in-phase samples with a second correlator chip code, for generating a third in-phase correlation signal and a third quadrature-phase correlation signal, respectively, and for generating a third output correlation signal from a square root of a sum of the square of the third in-phase correlation signal plus the square of the third quadrature-phase correlation signal; fourth correlator means for correlating the second plurality of in-phase samples and the second plurality of quadrature-phase samples with the second correlator chip code, for generating a fourth in-phase correlation signal and a fourth quadrature-phase correlation signal, respectively, and for generating a fourth output correlation signal from a square root of a sum of the square of the fourth in-phase correlation signal plus the square of the fourth quadrature-phase correlating signal; means for acquiring and tracking the first output correlation signal, the second output correlation signal, the third output correlation signal, and the fourth output correlation signal, for generating a reference signal; and means responsive to the reference signal for detecting the first output correlation signal, the second output correlation signal, the third output correlation signal and the fourth output correlation signal, respectively, and responsive to the the first or second output correlation signal having a greatest value for outputting a first data symbol, and responsive to the third or fourth output correlation signal having a greater value for outputting a second data symbol.

Claim 28

A spread spectrum receiver for demodulating a spread spectrum signal having a sequence of concatenated first and second chip codes, comprising: receiver means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means for repetitively sampling the in-phase signal at twice a chip rate of the spread spectrum signal and for generating, from first and second samples per chip of the in-phase signal, a first plurality of in-phase samples and a second plurality of in-phase samples, respectively; second means for repetitively sampling the quadrature-phase signal at twice a chip rate of the spread spectrum signal and for generating, from first and second samples per chip of the quadrature-phase signal, a first plurality of quadrature-phase samples and a second plurality of quadrature-phase samples, respectively; first correlator means for correlating the first plurality of in-phase samples of the first plurality of quadrature-phase samples with a first correlation chip code, for generating a first in-phase correlation signal and a first quadrature-phase correlation signal, respectively, and for generating a first output correlation signal from a square root of a sum of the square of the first in-phase correlation signal plus the square of the first quadrature-phase correlation signal; second correlator means for correlating the second plurality of in-phase samples and the second plurality of quadrature-phase samples with the first correlator chip code, for generating a second in-phase correlation signal and a second quadrature-phase correlation signal, respectively, and for generating a second output correlation signal from a square root of a sum of the square of the second in-phase correlation signal plus the square of the second quadrature-phase correlation signal; third correlator means for correlating the first plurality of in-phase samples and the first plurality of quadrature of in-phase samples with a second correlator chip code, for generating a third in-phase correlation signal and a third quadrature-phase correlation signal, respectively, and for generating a third output correlation signal from a square root of a sum of the square of the third in-phase correlation signal plus the square of the third quadrature-phase correlation signal; fourth correlator means for correlating the second plurality of in-phase samples and the second plurality of quadrature-phase samples with the second correlator chip code, for generating a fourth in-phase correlation signal and a fourth quadrature-phase correlation signal, respectively, and for generating a fourth output correlation signal from a square root of a sum of the square of the fourth in-phase correlation signal plus the square of the fourth quadrature-phase correlating signal; means for acquiring and tracking the first output correlation signal, the second output correlation signal, the third output correlation signal, and the fourth output correlation signal, for generating a reference signal; and means responsive to the reference signal for detecting the first output correlation signal, the second output correlation signal, the third output correlation signal and the fourth output correlation signal, respectively, and responsive to the the first or second output correlation signal having a greatest value for outputting a first data symbol, and responsive to the third or fourth output correlation signal having a greater value for outputting a second data symbol.

Claim 29

A spread spectrum receiver for demodulating a spread spectrum signal having a sequence of concatenated first and second chip codes, comprising: receiver means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means for repetitively sampling the in-phase signal at n greater than 1 times a chip rate of the spread spectrum signal for generating, from n samples per chip of the in-phase signal, n pluralities of in-phase samples, respectively; second means for repetitively sampling the quadrature-phase signal at n greater than 1 time a chip rate of the spread spectrum signal for generating, from n samples per chip of the quadrature-phase signal, n pluralities of quadrature-phase samples, respectively; first correlator means for correlating the n pluralities of in-phase samples and the n pluralities of quadrature-phase samples with a first correlator chip code, for generating a first in-phase correlation signal and a first quadrature-phase correlation signal, respectively, and for generating a first output correlation signal from a square root of a sum of the square of the first in-phase correlation signal plus the square of the first quadrature-phase correlation signal; second correlator means for correlating the n pluralities of in-phase samples and the n pluralities of quadrature-phase samples with a second correlator chip code, for generating a second in-phase correlation signal and a second quadrature-phase correlation signal, respectively, and for generating a second output correlation signal from a square root of a sum of the square of the second in-phase correlation signal plus the square of the second quadrature-phase correlation signal; means for acquiring and tracking the first output correlation signal and the second output correlation signal, for generating a reference signal; and means responsive to the reference signal for detecting the first output correlation signal and the second output correlation signal, respectively, responsive to detecting the first output correlation signal having a greater value for outputting a first data symbol, and responsive to detecting the second output correlation signal, having the greatest value for outputting a second data symbol, respectively.

Claim 30

A spread spectrum receiver for demodulating a spread spectrum signal having a sequence of concatenated first and second chip codes, comprising: receiver means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means for repetitively sampling the in-phase signal at n greater than 1 times a chip rate of the spread spectrum signal for generating, from n samples per chip of the in-phase signal, n pluralities of in-phase samples, respectively; second means for repetitively sampling the quadrature-phase signal at n greater than 1 time a chip rate of the spread spectrum signal for generating, from n samples per chip of the quadrature-phase signal, n pluralities of quadrature-phase samples, respectively; first correlator means for correlating the n pluralities of in-phase samples and the n pluralities of quadrature-phase samples with a first correlator chip code, for generating a first in-phase correlation signal and a first quadrature-phase correlation signal, respectively, and for generating a first output correlation signal from a square root of a sum of the square of the first in-phase correlation signal plus the square of the first quadrature-phase correlation signal; second correlator means for correlating the n pluralities of in-phase samples and the n pluralities of quadrature-phase samples with a second correlator chip code, for generating a second in-phase correlation signal and a second quadrature-phase correlation signal, respectively, and for generating a second output correlation signal from a square root of a sum of the square of the second in-phase correlation signal plus the square of the second quadrature-phase correlation signal; means for acquiring and tracking the first output correlation signal and the second output correlation signal, for generating a reference signal; and means responsive to the reference signal for detecting the first output correlation signal and the second output correlation signal, respectively, responsive to detecting the first output correlation signal having a greater value for outputting a first data symbol, and responsive to detecting the second output correlation signal, having the greatest value for outputting a second data symbol, respectively.

Claim 33

The method as set forth in claim 20 wherein: said first sampling step samples the in-phase signal at twice a chip rate of the spread spectrum signal to generate the plurality of in-phase samples; and said second sampling step samples the quadrature-phase signal at twice a chip rate of the spread spectrum signal to generate the plurality of quadrature-phase samples.

Claim 34

The method as set forth in claim 20 wherein: said first sampling step samples the in-phase signal at n greater than 1 times a chip rate of the spread spectrum signal to generate the plurality of in-phase samples; and said second sampling step samples the quadrature-phase signal at n greater 1 time a chip rate of the spread spectrum signal to generate the plurality of quadrature-phase samples.

Claim 37

The method as set forth in claim 23 wherein: said first sampling step samples the in-phase signal at twice a chip rate of the spread spectrum signal to generate the plurality of in-phase samples; and said second sampling means samples the quadrature-phase signal at twice a chip rate of the spread spectrum signal to generate the plurality of quadrature-phase

Claim 38

The method as set forth in claim 23 wherein: said first sampling step samples the in-phase signal at n greater than 1 times a chip rate of the spread spectrum signal to generate the plurality of in-phase samples; and said second sampling step samples the quadrature-phase signal at n greater than 1 times a chip rate of the spread spectrum signal to generate the plurality of quadrature-phase samples.

Claim 41

The method as set forth in claim 26 wherein: said first sampling step samples the in-phase signal at twice a chip rate of the spread spectrum signal to generate the plurality of in-phase samples; and said second sampling step samples the quadrature-phase signal at twice a chip rate of the spread spectrum signal to generate the plurality of quadrature-phase samples.

Claim 42

The method as set forth in claim 26 wherein: said first sampling step samples the in-phase signal at n greater than 1 times a chip rate of the spread spectrum signal to generate the plurality of in-phase samples; and said second sampling step samples the quadrature-phase signal at n greater than 1 times a chip rate of the spread spectrum signal to generate the plurality of quadrature-phase samples.

Claim 47

A spread spectrum receiver for demodulating a spread spectrum signal having a concatenated sequence of shortened chip codes, extended chip codes and normal chip codes, comprising: means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means for sampling the in-phase signal, thereby generating a plurality of in-phase samples; second means for sampling the quadrature-phase signal, thereby generating a plurality of quadrature-phase samples; correlator means responsive to a normal correlator chip code for correlating the plurality of in-phase samples with the normal correlator chip code to generate an in-phase correlation signal, for correlating the plurality of quadrature-phase samples with the normal correlator chip code to generate a quadrature-phase correlation signal, and for generating an output correlation signal from a square root of a sum of the square of the in-phase correlation signal plus the square of the quadrature-phase correlation signal; means for acquiring and tracking the output correlation signal for generating a reference timing signal; and means responsive to comparing the output correlation signal with the reference timing signal, for detecting the timing of the output correlation signal with respect to the reference timing signal, for decoding the output correlation signal.

Claim 48

A spread spectrum receiver for demodulating a spread spectrum signal having a concatenated sequence of shortened chip codes, extended chip codes and normal chip codes, comprising: means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means for sampling the in-phase signal, thereby generating a plurality of in-phase samples; second means for sampling the quadrature-phase signal, thereby generating a plurality of quadrature-phase samples; correlator means responsive to a normal correlator chip code for correlating the plurality of in-phase samples with the normal correlator chip code to generate an in-phase correlation signal, for correlating the plurality of quadrature-phase samples with the normal correlator chip code to generate a quadrature-phase correlation signal, and for generating an output correlation signal from a square root of a sum of the square of the in-phase correlation signal plus the square of the quadrature-phase correlation signal; means for acquiring and tracking the output correlation signal for generating a reference timing signal; and means responsive to comparing the output correlation signal with the reference timing signal, for detecting the timing of the output correlation signal with respect to the reference timing signal, for decoding the output correlation signal.

Claim 49

The spread spectrum receiver as set forth in claim 31 wherein: said first sampling means samples the in-phase signal at twice a chip rate of the spread spectrum signal to generate the plurality of in-phase samples; and said second sampling means samples the quadrature-phase signal at twice a chip rate of the spread spectrum signal to generate the plurality of quadrature-phase samples.

Claim 50

The spread spectrum receiver as set forth in claim 31 wherein: said first sampling means samples the in-phase signal at n greater than 1 times a chip rate of the spread spectrum signal to generate the plurality of in-phase samples; and said second sampling means samples the quadrature-phase signal at n greater than 1 times a chip rate of the spread spectrum signal to generate the plurality of quadrature-phase samples.

Claim 57

The method as set forth in claim 36 wherein: sampling repetitively the in-phase signal includes sampling the in-phase signal at twice a chip rate of the spread spectrum signal and adding, for a plurality of chips in the in-phase signal, the two samples per chip of the spread spectrum signal to generate the plurality of in-phase samples; and sampling repetitively the quadrature-phase signal includes sampling the quadrature-phase signal at twice a chip rate of the spread spectrum signal and adding, for a plurality of chips in the quadrature-phase signal, the two samples per chip of the spread spectrum signal to generate the plurality of quadrature-phase samples.

Claim 58

The method as set forth in claim 36 wherein: sampling repetitively the in-phase signal includes sampling the in-phase signal at n greater than 1 times a chip rate of the spread spectrum signal and adding, for a plurality of chips in the in-phase signal, the n samples per chip of the spread spectrum signal to generate the plurality of in-phase samples; and sampling repetitively the quadrature-phase signal includes sampling the quadrature-phase signal at n greater than 1 times a chip rate of the spread spectrum signal and adding, for a plurality of chips in the quadrature-phase signal, the n samples per chip of the spread spectrum signal to generate the plurality of quadrature-phase samples.

Claim 61

A spread spectrum receiver for demodulating a spread spectrum signal comprising: means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means coupled to said receiving means for repetitively sampling the in-phase signal at twice a chip rate of the spread spectrum signal to generate a sequence of in-phase samples; second means coupled to said receiving means for repetitively sampling the quadrature phase signal with at least twice a chip rate of the spread spectrum signal to generate a sequence of quadrature phase samples; first correlating means coupled to said first sampling means and responsive to when the sequence of in-phase samples is identical to a first plurality of 1-bit code chips for generating a first correlation signal; second correlating means coupled to said second sampling means and responsive to when the sequence of quadrature-phase samples is identical to with a second plurality of 1-bit code chips for generating a second correlation signal; and means coupled to said first correlating means and said second correlation means, for squaring the first correlating signal, for squaring the second correlation signal, for adding the squared first and second correlation signals, computing a square root of the sum of the squares.

Claim 62

A spread spectrum receiver for demodulating a spread spectrum signal comprising: means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means coupled to said receiving means for repetitively sampling the in-phase signal at twice a chip rate of the spread spectrum signal to generate a sequence of in-phase samples; second means coupled to said receiving means for repetitively sampling the quadrature phase signal with at least twice a chip rate of the spread spectrum signal to generate a sequence of quadrature phase samples; first correlating means coupled to said first sampling means and responsive to when the sequence of in-phase samples is identical to a first plurality of 1-bit code chips for generating a first correlation signal; second correlating means coupled to said second sampling means and responsive to when the sequence of quadrature-phase samples is identical to with a second plurality of 1-bit code chips for generating a second correlation signal; and means coupled to said first correlating means and said second correlation means, for squaring the first correlating signal, for squaring the second correlation signal, for adding the squared first and second correlation signals, computing a square root of the sum of the squares.

Claim 63

A spread spectrum receiver for demodulating a spread spectrum signal comprising: means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means for repetitively sampling the in-phase signal at n greater than 1 times a chip rate of the spread spectrum signal for generating a plurality of in-phase samples; second means for repetitively sampling the quadrature phase signal at n greater than 1 times a chip rate of the spread spectrum signal for generating a plurality of quadrature phase samples; first correlating means responsive to when the plurality of in-phase samples correlate with a first plurality of 1-bit code chips for generating a first correlation signal; second correlating means responsive to when the plurality of quadrature phase samples correlate with a second plurality of 1-bit code chips for generating a second correlation signal; and means for squaring the first correlation signal, for squaring the second correlation signal, and for adding the squared first correlation signal and the squared second correlation signal, and for computing a square root of the sum of the squares.

Claim 64

A spread spectrum receiver for demodulating a spread spectrum signal comprising: means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means for repetitively sampling the in-phase signal at n greater than 1 times a chip rate of the spread spectrum signal for generating a plurality of in-phase samples; second means for repetitively sampling the quadrature phase signal at n greater than 1 times a chip rate of the spread spectrum signal for generating a plurality of quadrature phase samples; first correlating means responsive to when the plurality of in-phase samples correlate with a first plurality of 1-bit code chips for generating a first correlation signal; second correlating means responsive to when the plurality of quadrature phase samples correlate with a second plurality of 1-bit code chips for generating a second correlation signal; and means for squaring the first correlation signal, for squaring the second correlation signal, and for adding the squared first correlation signal and the squared second correlation signal, and for computing a square root of the sum of the squares.

Claim 71

A spread spectrum receiver for demodulating a spread spectrum signal having a sequence of concatenated first and second chip codes, comprising: receiver means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means for repetitively sampling the in-phase signal at twice a chip rate of the spread spectrum signal and for generating a plurality of in-phase samples; second means for repetitively sampling the quadrature-phase signal at twice a chip rate of the spread spectrum signal and for generating a plurality of quadrature-phase samples; first correlator means for correlating the plurality of in-phase samples and the plurality of quadrature-phase samples with a first correlator chip code, for generating a first in-phase correlation signal and a first quadrature-phase correlation signal, respectively, and for generating a first output correlation signal from a square root of a sum of the square of the first in-phase correlation signal plus the square of the first quadrature-phase correlation signal; second correlator means for correlating the plurality of in-phase samples and the plurality of quadrature-phase samples with a second correlator signal and a second quadrature-phase correlation signal, respectively, and for generating a second output correlation signal from a square root of a sum of the square of the second in-phase correlation signal plus the square of the second quadrature-phase correlation signal; means for acquiring and tracking the first output correlation signal and the second output correlation signal, for generating a reference signal; and means responsive to the reference signal for detecting the first output correlation signal and the second output correlation signal, respectively, and responsive to the first output correlation signal having a greatest value for outputting a first data symbol, and responsive to the second output correlation signal having the greatest value for outputting a second data symbol.

Claim 72

A spread spectrum receiver for demodulating a spread spectrum signal having a sequence of concatenated first and second chip codes, comprising: receiver means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means for repetitively sampling the in-phase signal at twice a chip rate of the spread spectrum signal and for generating a plurality of in-phase samples; second means for repetitively sampling the quadrature-phase signal at twice a chip rate of the spread spectrum signal and for generating a plurality of quadrature-phase samples; first correlator means for correlating the plurality of in-phase samples and the plurality of quadrature-phase samples with a first correlator chip code, for generating a first in-phase correlation signal and a first quadrature-phase correlation signal, respectively, and for generating a first output correlation signal from a square root of a sum of the square of the first in-phase correlation signal plus the square of the first quadrature-phase correlation signal; second correlator means for correlating the plurality of in-phase samples and the plurality of quadrature-phase samples with a second correlator signal and a second quadrature-phase correlation signal, respectively, and for generating a second output correlation signal from a square root of a sum of the square of the second in-phase correlation signal plus the square of the second quadrature-phase correlation signal; means for acquiring and tracking the first output correlation signal and the second output correlation signal, for generating a reference signal; and means responsive to the reference signal for detecting the first output correlation signal and the second output correlation signal, respectively, and responsive to the first output correlation signal having a greatest value for outputting a first data symbol, and responsive to the second output correlation signal having the greatest value for outputting a second data symbol.

Claim 73

A spread spectrum receiver for demodulating a spread spectrum signal having a sequence of concatenated first and second chip codes, comprising: receiver means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means for repetitively sampling the in-phase signal at n greater than 1 times a chip rate of the spread spectrum signal for generating a plurality of in-phase samples; second means for repetitively sampling the quadrature-phase signal at n greater than 1 times a chip rate of the spread spectrum signal for generating a plurality of quadrature-phase samples; first correlator means for correlating the plurality of in-phase samples and the plurality of quadrature-phase samples with a first correlator chip code, thereby generating a first correlation signal; second correlator means for correlating the plurality of in-phase samples and the plurality of quadrature-phase samples with a second correlator chip code, thereby generating a second correlation signal; means for acquiring and tracking the first correlation signal and the second correlation signal, for generating a reference signal; and means responsive to the reference signal and detecting the first correlation signal and the second correlation signal, respectively, responsive to the first correlation signal having a greatest value for outputting a first data symbol, and responsive to the second correlation signal having the greatest value for outputting a second data symbol, respectively.

Claim 74

A spread spectrum receiver for demodulating a spread spectrum signal having a sequence of concatenated first and second chip codes, comprising: receiver means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means for repetitively sampling the in-phase signal at n greater than 1 times a chip rate of the spread spectrum signal for generating a plurality of in-phase samples; second means for repetitively sampling the quadrature-phase signal at n greater than 1 times a chip rate of the spread spectrum signal for generating a plurality of quadrature-phase samples; first correlator means for correlating the plurality of in-phase samples and the plurality of quadrature-phase samples with a first correlator chip code, thereby generating a first correlation signal; second correlator means for correlating the plurality of in-phase samples and the plurality of quadrature-phase samples with a second correlator chip code, thereby generating a second correlation signal; means for acquiring and tracking the first correlation signal and the second correlation signal, for generating a reference signal; and means responsive to the reference signal and detecting the first correlation signal and the second correlation signal, respectively, responsive to the first correlation signal having a greatest value for outputting a first data symbol, and responsive to the second correlation signal having the greatest value for outputting a second data symbol, respectively.

Claim 79

A spread spectrum receiver for demodulating a spread spectrum signal having a concatenated sequence of shortened chip codes, extended chip codes and normal chip codes, comprising: means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means for sampling the in-phase signal at twice a chip rate of the spread spectrum signal for generating a plurality of in-phase samples; second means for sampling the quadrature-phase signal at twice a chip rate of the spread spectrum signal for generating a plurality of quadrature-phase samples; correlator means responsive to a normal chip code for correlating the plurality of in-phase samples with the normal chip code to generate an in-phase correlation signal, for correlating the plurality of quadrature-phase samples with the normal chip code to generate a quadrature-phase correlation signal, and for generating an output correlation signal from a square root of a sum of the square of the in-phase correlation signal plus the square of the quadrature-phase correlation signal; means coupled to said correlator means for acquiring and tracking the output correlation signal, for generating a reference timing signal; and means coupled to said correlator means, coupled to said acquiring and tracking means, responsive to comparing the output correlation signal with the reference timing signal, for detecting the timing of the output correlation signal with respect to the reference timing signal, and for decoding the output correlation signal.

Claim 80

A spread spectrum receiver for demodulating a spread spectrum signal having a concatenated sequence of shortened chip codes, extended chip codes and normal chip codes, comprising: means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means for sampling the in-phase signal at twice a chip rate of the spread spectrum signal for generating a plurality of in-phase samples; second means for sampling the quadrature-phase signal at twice a chip rate of the spread spectrum signal for generating a plurality of quadrature-phase samples; correlator means responsive to a normal chip code for correlating the plurality of in-phase samples with the normal chip code to generate an in-phase correlation signal, for correlating the plurality of quadrature-phase samples with the normal chip code to generate a quadrature-phase correlation signal, and for generating an output correlation signal from a square root of a sum of the square of the in-phase correlation signal plus the square of the quadrature-phase correlation signal; means coupled to said correlator means for acquiring and tracking the output correlation signal, for generating a reference timing signal; and means coupled to said correlator means, coupled to said acquiring and tracking means, responsive to comparing the output correlation signal with the reference timing signal, for detecting the timing of the output correlation signal with respect to the reference timing signal, and for decoding the output correlation signal.

Claim 81

A spread spectrum receiver for demodulating a spread spectrum signal having a concatenated sequence of shortened chip codes, extended chip codes and normal chip codes, comprising: means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means for sampling the in-phase signal at n greater than 1 times a chip rate of the spread spectrum signal for generating a plurality of in-phase samples; second means for sampling the quadrature-phase signal at n greater than 1 times a chip rate of the spread spectrum signal for generating a plurality of quadrature-phase samples; correlator means responsive to a normal chip code for correlating the plurality of in-phase samples with the normal chip code to generate an in-phase correlation signal, for correlating the plurality of quadrature-phase samples with the normal chip code to generate a quadrature-phase correlation signal, and for generating an output correlation signal from a square root of a sum of the square of the in-phase correlation signal plus the square of the quadrature-phase correlation signal; means coupled to said correlator means for acquiring and tracking the output correlation signal, for generating a reference timing signal; and means coupled to said correlator means, coupled to said acquiring and tracking means, responsive to comparing the output correlation signal with the reference timing signal, for detecting the timing of the output correlation signal with respect to the reference timing signal, and for decoding the output correlation signal.

Claim 82

A spread spectrum receiver for demodulating a spread spectrum signal having a concatenated sequence of shortened chip codes, extended chip codes and normal chip codes, comprising: means for receiving the spread spectrum signal and generating an in-phase signal and a quadrature-phase signal; first means for sampling the in-phase signal at n greater than 1 times a chip rate of the spread spectrum signal for generating a plurality of in-phase samples; second means for sampling the quadrature-phase signal at n greater than 1 times a chip rate of the spread spectrum signal for generating a plurality of quadrature-phase samples; correlator means responsive to a normal chip code for correlating the plurality of in-phase samples with the normal chip code to generate an in-phase correlation signal, for correlating the plurality of quadrature-phase samples with the normal chip code to generate a quadrature-phase correlation signal, and for generating an output correlation signal from a square root of a sum of the square of the in-phase correlation signal plus the square of the quadrature-phase correlation signal; means coupled to said correlator means for acquiring and tracking the output correlation signal, for generating a reference timing signal; and means coupled to said correlator means, coupled to said acquiring and tracking means, responsive to comparing the output correlation signal with the reference timing signal, for detecting the timing of the output correlation signal with respect to the reference timing signal, and for decoding the output correlation signal.

Claim 83

The spread spectrum receiver as in any one of claims 1, 18, 19, 31, 34, 35, 45, 49, or 50, further comprising: an adding means, responsive to an in-phase correlation signal and to an quadrature-phase correlation signal, for adding the square of each at least one in-phase correlation signal and the square of each at least one quadrature-phase correlation signal; and a means for generating a square root of the sum of the squares of each at least one in-phase correlation signal and of each at least one quadrature-phase correlation signal as an output correlation signal.