CDMA communications and geolocation system and method

Claim 2

A spread-spectrum CDMA communications system for communicating base-message data to a plurality of remote units, and range locating each of said remote units, said spread-spectrum CDMA communications system comprising: a plurality of base stations for communicating base-message data to the plurality of remote units, each of said base stations including, base-spreading means for spread-spectrum processing the base-message data; base-generic means for generating a base-generic-chip-code signal; base-combiner means for combining the base-generic-chip-code signal with the spread-spectrum-processed-base-message data, thereby generating a base-CDMA signal; base-transmitter means for transmitting the base-CDMA signal from said base station to said remote unit; a base antenna coupled to said base-transmitter means; each of said remote units including, a remote antenna; remote-detection means, coupled to said remote antenna, for detecting the base-generic-chip-code signal embedded in the base-CDMA signal, and for recovering, using the detected-base-generic-chip-code signal, the base-message data communicated from said base station; remote-spreading means for spread-spectrum processing remote-message data; remote-combiner means, responsive to the detected-generic-chip-code signal and the spread-spectrum-processed-remote data for generating a remote-CDMA signal; remote-transmitter means for transmitting the remote-CDMA signal from the remote unit to said base station; wherein each of said base stations further includes, base-detection means, coupled to said base antenna, for detecting the remote-generic-chip-code signal embedded in the remote-CDMA signal, and for recovering, using the detected-remote-generic-chip-code signal, the remote-message data communicated from said remote unit; and range means, responsive to the detected- remote-generic-chip-code signal and the base-generic-chip-code signal for determining a range delay between said remote unit and said base station.

Claim 3

The spread-spectrum CDMA communications system as set forth in claim 1 wherein said base-transmitter means transmits the base-CDMA signal on a base-carrier frequency and said remote-transmitter means transmits the remote-CDMA signal on a remote carrier frequency, with the remote-carrier frequency different from the base-carrier frequency, for separating a bandwidth of the base-CDMA signal from a bandwidth of the remote-CDMA signal.

Claim 4

The spread-spectrum CDMA communications system as set forth in claim 1 wherein said base-transmitter means transmits the base CDMA signal with a burst format on a first carrier frequency, and said remote-transmitter means, responsive to receiving the base-CDMA signal, transmits the remote-CDMA signal with a burst format on the first carrier frequency.

Claim 5

The spread-spectrum CDMA communications system as set forth in claim 1 wherein said remote-detection means includes means for synchronizing the spread-spectrum-processed-message data embedded in the base-CDMA signal with the detected-base-generic-chip-code signal.

Claim 6

The spread-spectrum CDMA communications system as set forth in claim 1 wherein said base-processing means at said base station includes means for processing message data for particular remote units with a selected chip code.

Claim 7

The spread-spectrum CDMA communications system as set forth in claim 1 wherein said remote-detection means includes: a message-chip-code generator for generating a message-chip-code signal with a chip-codeword corresponding to the remote unit; a product detector for mixing the message-chip-code signal with a received base-CDMA signal; a bandpass filter for filtering the detected spread-spectrum signal; and a data detector for detecting base-message data in the detected spread-spectrum signal.

Claim 8

The spread-spectrum CDMA communications system as set forth in claim 1 wherein said remote-detection means includes: a matched filter having an impulse response matched to a message-chip-code signal used at said base station; and a data detector for detecting message data at an output of said matched filter.

Claim 9

A spread-spectrum CDMA communications system for communicating base-message data to a plurality of remote units, and range locating each of said remote units, said spread-spectrum CDMA communications system comprising: at least one base station for communicating base-message data to the plurality of remote units, each of said base stations including, a base-spread-spectrum modulator for spread-spectrum processing the message data; a base-generic-chip-code generator for generating a base-generic-chip-code signal; a base combiner for combining the base-generic-chip-code signal with the spread-spectrum-processed-base-message data, thereby generating a base-CDMA signal; a base transmitter for transmitting the base-CDMA signal from said base station to said remote unit; a base antenna coupled to said base transmitter; a plurality of remote units each of said remote units including, a remote antenna; a remote-unit detector, coupled to said remote antenna, for detecting the base-generic-chip-code signal embedded in the base-CDMA signal, and for recovering, using the detected-base-generic-chip-code signal, the base-message data communicated from said base station; a remote-spread-spectrummodulator for spread-spectrum processing remote-unit-message data; a remote-unit combiner, responsive to the detected-generic-chip-code signal and the spread-spectrum-processed-remote data for generating a remote-CDMA signal; a remote unit transmitter for transmitting the remote-CDMA signal from the remote unit to the base station; wherein each of said base stations further includes. a base detector, coupled to said base antenna, for detecting the remote-generic-chip-code signal embedded in the remote-CDMA signal, and for recovering, using the detected-remote-generic-chip-code signal, the remote message data communicated from said remote unit; and a range circuit, responsive to the detected-remote-generic-chip-code signal and the base-generic-chip-code signal for determining a range delay between said remote unit and said base station.

Claim 10

A spread-spectrum CDMA communications system for communicating base-message data to a plurality of remote units, and range locating each of said remote units, said spread-spectrum CDMA communications system comprising: at least one base station for communicating base-message data to the plurality of remote units, each of said base stations including, a base-spread-spectrum modulator for spread-spectrum processing the message data; a base-generic-chip-code generator for generating a base-generic-chip-code signal; a base combiner for combining the base-generic-chip-code signal with the spread-spectrum-processed-base-message data, thereby generating a base-CDMA signal; a base transmitter for transmitting the base-CDMA signal from said base station to said remote unit; a base antenna coupled to said base transmitter; a plurality of remote units each of said remote units including, a remote antenna; a remote-unit detector, coupled to said remote antenna, for detecting the base-generic-chip-code signal embedded in the base-CDMA signal, and for recovering, using the detected-base-generic-chip-code signal, the base-message data communicated from said base station; a remote-spread-spectrummodulator for spread-spectrum processing remote-unit-message data; a remote-unit combiner, responsive to the detected-generic-chip-code signal and the spread-spectrum-processed-remote data for generating a remote-CDMA signal; a remote unit transmitter for transmitting the remote-CDMA signal from the remote unit to the base station; wherein each of said base stations further includes. a base detector, coupled to said base antenna, for detecting the remote-generic-chip-code signal embedded in the remote-CDMA signal, and for recovering, using the detected-remote-generic-chip-code signal, the remote message data communicated from said remote unit; and a range circuit, responsive to the detected-remote-generic-chip-code signal and the base-generic-chip-code signal for determining a range delay between said remote unit and said base station.

Claim 11

The spread-spectrum CDMA communications system as set forth in claim 8 wherein said base transmitter transmits the base-CDMA signal on a base-carrier frequency and said remote-transmitter means transmits the remote-CDMA signal on a remote carrier frequency, with the remote-carrier frequency different from the base-carrier frequency, for separating a bandwidth of the base-CDMA signal from a bandwidth of the remote-CDMA signal.

Claim 12

The spread-spectrum CDMA communications system as set forth in claim 8 wherein said base transmitter transmits the base-CDMA signal with a burst format on a first carrier frequency, and said remote-unit transmitter, responsive to said remote unit receiving the base-CDMA signal, transmits the remote-CDMA signal with a burst format on the first carrier frequency.

Claim 13

The spread-spectrum CDMA communications system as set forth in claim 8 wherein said remote-unit detector includes means for synchronizing the spread-spectrum-processed-message data embedded in the base-CDMA signal with the detected-base-generic-chip-code signal.

Claim 14

The spread-spectrum CDMA communications system as set forth in claim 8 wherein said base-spread-spectrum-modulator at said base station includes means for processing message data for particular remote units with a selected chip code.

Claim 15

The spread-spectrum CDMA communications system as set forth in claim 8 wherein said remote-unit detector includes: a message-chip-code generator for generating a message-chip-code signal with a chip-codeword corresponding to the remote unit; a product detector for mixing the message-chip-code signal with a received base-CDMA signal; a bandpass filter for filtering the detected spread-spectrum signal; and a data detector for detecting message data in the detected spread-spectrum signal.

Claim 16

The spread-spectrum CDMA communications system as set forth in claim 8 wherein said remote-unit detector includes: a matched filter having an impulse response matched to a message-chip-code signal used at said base station; and a data detector for detecting base-message data at an output of said matched filter.

Claim 17

A spread-spectrum CDMA communications system for communicating remote-message data to a base station, and range locating at each of said remote units, said spread-spectrum CDMA communications system comprising: a plurality of remote units for communicating remote-message data to at least one base station, each of said remote units including, remote-spreading means for spread-spectrum processing the remote-message data; remote-generic means for generating a remote-generic-chip-code signal; remote-combiner means for combining the remote-generic-chip-code signal with the spread-spectrum-processed-remote-message data, thereby generating a remote-CDMA signal; remote-transmitter means for transmitting the remote-CDMA signal from said remote unit to said base station; a remote antenna coupled to said remote-transmitter means; said base station including, a base antenna; base-detection means, coupled to said base antenna, for detecting the remote-generic-chip-code signal embedded in the remote-CDMA signal, and for recovering, using the detected-remote-generic-chip-code signal, the remote-message data communicated from said remote unit; base processing means for spread-spectrum processing base-message data; base-combiner means, responsive to the detected-remote-generic-chip-code signal and the spread-spectrum-processed-base-message data for generating a base-CDMA signal; base-transmitter means for transmitting the base-CDMA signal from the base station to the remote unit; wherein at least one of said remote units further includes, remote-detection means, coupled to said remote antenna, for detecting the base-generic-chip-code signal embedded in the base-CDMA signal, and for recovering, using the detected-base-generic-chip-code signal, the base-message data communicated from said base station; and range means, responsive to the detected-base-generic-chip-code signal and the remote-generic-chip-code signal, for determining a range delay between said remote unit and said base station.

Claim 18

A spread-spectrum CDMA communications system for communicating remote-message data to a base station, and range locating at each of said remote units, said spread-spectrum CDMA communications system comprising: a plurality of remote units for communicating remote-message data to at least one base station, each of said remote units including, remote-spreading means for spread-spectrum processing the remote-message data; remote-generic means for generating a remote-generic-chip-code signal; remote-combiner means for combining the remote-generic-chip-code signal with the spread-spectrum-processed-remote-message data, thereby generating a remote-CDMA signal; remote-transmitter means for transmitting the remote-CDMA signal from said remote unit to said base station; a remote antenna coupled to said remote-transmitter means; said base station including, a base antenna; base-detection means, coupled to said base antenna, for detecting the remote-generic-chip-code signal embedded in the remote-CDMA signal, and for recovering, using the detected-remote-generic-chip-code signal, the remote-message data communicated from said remote unit; base processing means for spread-spectrum processing base-message data; base-combiner means, responsive to the detected-remote-generic-chip-code signal and the spread-spectrum-processed-base-message data for generating a base-CDMA signal; base-transmitter means for transmitting the base-CDMA signal from the base station to the remote unit; wherein at least one of said remote units further includes, remote-detection means, coupled to said remote antenna, for detecting the base-generic-chip-code signal embedded in the base-CDMA signal, and for recovering, using the detected-base-generic-chip-code signal, the base-message data communicated from said base station; and range means, responsive to the detected-base-generic-chip-code signal and the remote-generic-chip-code signal, for determining a range delay between said remote unit and said base station.

Claim 19

The spread-spectrum CDMA communications system as set forth in claim 15 wherein said base-transmitter means transmits the base-CDMA signal on a base-carrier frequency and said remote-transmitter means transmits the remote-CDMA signal on a remote carrier frequency, with the remote-carrier frequency different from the base-carrier frequency, for separating a bandwidth of the base-CDMA signal from a bandwidth of the remote-CDMA signal.

Claim 20

The spread-spectrum CDMA communications system as set forth in claim 15 wherein said remote-transmitter means transmits the remote-CDMA signal with a burst format on a first carrier frequency, and said base-transmitter means, responsive to receiving the remote-CDMA signal, transmits the base-CDMA signal with a burst format on the first carrier frequency.

Claim 21

The spread-spectrum CDMA communications system as set forth in claim 15 wherein said remote-detection means includes means for synchronizing the spread-spectrum-processed-message data embedded in the base-CDMA signal with the detected-base-generic-chip-code signal.

Claim 22

The spread-spectrum CDMA communications system as set forth in claim 15 wherein said base-processing means at said base station includes means for processing message data for particular remote units with a selected chip code.

Claim 23

The spread-spectrum CDMA communications system as set forth in claim 15 wherein said remote-detection means includes: a message-chip-code generator for generating a message-chip-code signal with a chip-codeword corresponding to the remote unit; a product detector for mixing the message-chip-code signal with a received base-CDMA signal; a bandpass filter for filtering the detected spread-spectrum signal; and a data detector for detecting message data in the detected spread-spectrum signal.

Claim 24

The spread-spectrum CDMA communications system as set forth in claim 15 wherein said remote-detection means includes: a matched filter having an impulse response matched to a message-chip-code signal used at said base station; and a data detector for detecting base-message data at an output of said matched filter.

Claim 25

A spread-spectrum CDMA communications system for communicating remote-message data to a base station, and range locating at each of said remote units, said spread-spectrum CDMA communications system comprising: a plurality of remote units for communicating remote-message data to a base station, each of said remote units including, a remote-spread-spectrummodulator for spread-spectrum processing the remote-message data; a remote-generic-chip-code generator for generating a remote-generic-chip-code signal; a remote-unit combiner for combining the remote-generic-chip-code signal with the spread-spectrum-processed-remote-message data, thereby generating a remote-CDMA signal; a remote-unit transmitter for transmitting the remote-CDMA signal from said remote unit to said base station; a remote antenna coupled to said remote-unit transmitter; said base station including, a base antenna; base-detection means, coupled to said base antenna, for detecting the remote-generic-chip-code signal embedded in the remote-CDMA signal, and for recovering, using the detected-remote-generic-chip-code signal, the remote-message data communicated from said remote unit; a base spread-spectrummodulator for spread-spectrum processing base-message data; a base combiner, responsive to the detected-generic-remote-chip-code signal and the spread-spectrum-processed-base-message data for generating a base-CDMA signal; a base transmitter for transmitting the base-CDMA signal from the base station to the remote unit; wherein at least one of said remote units further includes, a remote detector, coupled to said remote antenna, for detecting the base-generic-chip-code signal embedded in the base-CDMA signal, and for recovering, using the detected-base-generic-chip-code signal, the base message data communicated from said base station; and a range circuit, responsive to the detected-base-generic-chip-code signal and the remote-generic-chip-code signal for determining a range delay between said remote unit and said base station.

Claim 26

A spread-spectrum CDMA communications system for communicating remote-message data to a base station, and range locating at each of said remote units, said spread-spectrum CDMA communications system comprising: a plurality of remote units for communicating remote-message data to a base station, each of said remote units including, a remote-spread-spectrummodulator for spread-spectrum processing the remote-message data; a remote-generic-chip-code generator for generating a remote-generic-chip-code signal; a remote-unit combiner for combining the remote-generic-chip-code signal with the spread-spectrum-processed-remote-message data, thereby generating a remote-CDMA signal; a remote-unit transmitter for transmitting the remote-CDMA signal from said remote unit to said base station; a remote antenna coupled to said remote-unit transmitter; said base station including, a base antenna; base-detection means, coupled to said base antenna, for detecting the remote-generic-chip-code signal embedded in the remote-CDMA signal, and for recovering, using the detected-remote-generic-chip-code signal, the remote-message data communicated from said remote unit; a base spread-spectrummodulator for spread-spectrum processing base-message data; a base combiner, responsive to the detected-generic-remote-chip-code signal and the spread-spectrum-processed-base-message data for generating a base-CDMA signal; a base transmitter for transmitting the base-CDMA signal from the base station to the remote unit; wherein at least one of said remote units further includes, a remote detector, coupled to said remote antenna, for detecting the base-generic-chip-code signal embedded in the base-CDMA signal, and for recovering, using the detected-base-generic-chip-code signal, the base message data communicated from said base station; and a range circuit, responsive to the detected-base-generic-chip-code signal and the remote-generic-chip-code signal for determining a range delay between said remote unit and said base station.

Claim 27

The spread-spectrum CDMA communications system as set forth in claim 22 wherein said base transmitter transmits the base-CDMA signal on a base-carrier frequency and said remote-unit transmitter transmits the remote-CDMA signal on a remote carrier frequency, with the remote-carrier frequency different from the base-carrier frequency.

Claim 28

The spread-spectrum CDMA communications system as set forth in claim 22 wherein said remote transmitter transmits the remote-CDMA signal with a burst format on a first carrier frequency, and said base transmitter, responsive to receiving at the base station the remote-CDMA signal, transmits the base-CDMA signal with a burst format on the first carrier frequency.

Claim 29

The spread-spectrum CDMA communications system as set forth in claim 22 wherein said remote detector includes means for synchronizing the spread-spectrum-processed-base-message data embedded in the base-CDMA signal with the detected-base-generic-chip-code signal.

Claim 30

The spread-spectrum CDMA communications system as set forth in claim 22 wherein said base spread-spectrum modulator includes means for processing message data for particular remote units with a selected chip code.

Claim 31

The spread-spectrum CDMA communications system as set forth in claim 22 wherein said remote detector includes: a message-chip-code generator for generating a message-chip-code signal with a chip-codeword corresponding to the remote unit; a product detector for mixing the message-chip-code signal with a received base-CDMA signal; a bandpass filter for filtering the detected spread-spectrum signal; and a data detector for detecting message data in the detected spread-spectrum signal.

Claim 32

The spread-spectrum CDMA communications system as set forth in claim 22 wherein said remote detector includes: a matched filter having an impulse response matched to a message-chip-code signal used at said base station; and a data detector for detecting base-message data at an output of said matched filter.

Claim 33

A spread-spectrum CDMA communications method for communicating base-message data to a plurality of remote units, and range locating each of said remote units, said spread-spectrum CDMA communications method comprising the steps of: spread-spectrum processing the base-message data; generating a base-generic-chip-code signal; combining the base-generic-chip-code signal with the spread-spectrum-processed-base-message data, thereby generating a base-CDMA signal; transmitting the base-CDMA signal from said base station to said remote unit; detecting the base-generic-chip-code signal embedded in the base-CDMA signal; recovering, using the detected-base-generic-chip-code signal, the base-message data; spread-spectrum processing remote-message data; generating, using the detected-generic-chip-code signal and the spread-spectrum-processed-remote data, a remote-CDMA signal; transmitting the remote-CDMA signal from the remote unit to the base station; detecting the remote-generic-chip-code signal embedded in the remote-CDMA signal; recovering, using the detected-remote-generic-chip-code signal, the remote-message data; and determining, using the detected-remote-generic-chip-code signal and the base-generic-chip-code signal, a range delay between said remote unit and said base station.

Claim 34

A spread-spectrum CDMA communications method for communicating base-message data to a plurality of remote units, and range locating each of said remote units, said spread-spectrum CDMA communications method comprising the steps of: spread-spectrum processing the base-message data; generating a base-generic-chip-code signal; combining the base-generic-chip-code signal with the spread-spectrum-processed-base-message data, thereby generating a base-CDMA signal; transmitting the base-CDMA signal from said base station to said remote unit; detecting the base-generic-chip-code signal embedded in the base-CDMA signal; recovering, using the detected-base-generic-chip-code signal, the base-message data; spread-spectrum processing remote-message data; generating, using the detected-generic-chip-code signal and the spread-spectrum-processed-remote data, a remote-CDMA signal; transmitting the remote-CDMA signal from the remote unit to the base station; detecting the remote-generic-chip-code signal embedded in the remote-CDMA signal; recovering, using the detected-remote-generic-chip-code signal, the remote-message data; and determining, using the detected-remote-generic-chip-code signal and the base-generic-chip-code signal, a range delay between said remote unit and said base station.

Claim 35

The spread-spectrum CDMA communications method as set forth in claim 29 wherein: the step of transmitting the base-CDMA signal includes the steps of transmitting the base-CDMA signal on a base-carrier frequency; and the step of transmitting the remote-CDMA signal includes the step of transmitting the remote-CDMA signal on a remote carrier frequency, with the remote-carrier frequency different from the base-carrier frequency.

Claim 36

The spread-spectrum CDMA communications method as set forth in claim 29 wherein: the step of transmitting the base-CDMA signal includes the step of transmitting with a burst format; and the step of transmitting the remote-CDMA signal is in response to receiving the base-CDMA signal.

Claim 37

The spread-spectrum CDMA communications method as set forth in claim 29 wherein the step of spread-spectrum processing the base-message data includes the step of spread-spectrum processing the base-message data with a selected chip code.

Claim 38

The spread-spectrum CDMA communications system as set forth in claim 29 wherein said base-processing means at said base station includes means for processing message data for particular remote units with a selected chip code.

Claim 39

The spread-spectrum CDMA communications method as set forth in claim 29 wherein the step of detecting includes: generating a message-chip-code signal with a chip-codeword corresponding to the remote unit; mixing the message-chip-code signal with a received base-combined-spread-spectrum signal; filtering the detected spread-spectrum signal; and detecting base-message data in the detected spread-spectrum signal.

Claim 40

The spread-spectrum CDMA communications method as set forth in claim 29 wherein the step of detecting includes: matched filtering with an impulse response matched to a message-chip-code signal used at said base station; and detecting base-message data after the step of matched filtering.

Claim 41

A spread-spectrum CDMA communications method for communicating base-message data from a plurality of base stations to a plurality of remote units, and range locating each of said plurality of remote units, and for communicating remote-message data from said plurality of remote units to said plurality of base stations, said spread-spectrum CDMA communication method comprising the steps of: spread-spectrum processing the base-message data; generating a base-generic-chip-code signal; generating a base-generic-chip-code signal with the spread-spectrum-processed-base-message data, thereby generating a base-CDMA signal; transmitting the base-CDMA signal from a base station to a remote unit; receiving the base-CDMA signal at the remote unit; detecting the base-generic-chip-code signal embedded in the base-CDMA signal; recovering, using the detected-base-generic-chip-code signal, the base-message data; spread-spectrum processing the remote-message data; generating a remote-generic-chip-code signal; generating, using the remote-generic-chip-code signal and the spread-spectrum-processed-remote-message data, a remote-CDMA signal; transmitting the remote-CDMA signal from the remote unit to the base station; receiving the remote-CDMA signal at the base station; detecting the remote-generic-chip-code signal embedded in the remote-CDMA signal; recovering, using the detected-remote-generic-chip-code signal, the remote-message data; and determining, using the detected-remote-generic-chip-code signal and the base-generic-chip-code signal, a range delay between the remote unit and the base station.

Claim 42

A spread-spectrum CDMA communications method for communicating base-message data from a plurality of base stations to a plurality of remote units, and range locating each of said plurality of remote units, and for communicating remote-message data from said plurality of remote units to said plurality of base stations, said spread-spectrum CDMA communication method comprising the steps of: spread-spectrum processing the base-message data; generating a base-generic-chip-code signal; generating a base-generic-chip-code signal with the spread-spectrum-processed-base-message data, thereby generating a base-CDMA signal; transmitting the base-CDMA signal from a base station to a remote unit; receiving the base-CDMA signal at the remote unit; detecting the base-generic-chip-code signal embedded in the base-CDMA signal; recovering, using the detected-base-generic-chip-code signal, the base-message data; spread-spectrum processing the remote-message data; generating a remote-generic-chip-code signal; generating, using the remote-generic-chip-code signal and the spread-spectrum-processed-remote-message data, a remote-CDMA signal; transmitting the remote-CDMA signal from the remote unit to the base station; receiving the remote-CDMA signal at the base station; detecting the remote-generic-chip-code signal embedded in the remote-CDMA signal; recovering, using the detected-remote-generic-chip-code signal, the remote-message data; and determining, using the detected-remote-generic-chip-code signal and the base-generic-chip-code signal, a range delay between the remote unit and the base station.

Claim 43

The spread-spectrum CDMA communications method as set forth in claim 36 wherein: the step of transmitting the base-CDMA signal includes the steps of transmitting the base-CDMA signal on a base-carrier frequency; and the step of transmitting the remote-CDMA signal includes the step of transmitting the remote-CDMA signal on a remote carrier frequency, with the remote-carrier frequency different from the base-carrier frequency.

Claim 44

The spread-spectrum CDMA communications method as set forth in claim 36 wherein: the step of transmitting the base-CDMA signal includes the step of transmitting with a burst format; and the step of transmitting the remote-CDMA signal is in response to receiving the base-CDMA signal.

Claim 45

The spread-spectrum CDMA communications method as set forth in claim 36 wherein the step of spread-spectrum processing the base-message data includes the step of spread-spectrum processing the base-message data with a selected chip code.

Claim 46

The spread-spectrum CDMA communications system as set forth in claim 36 wherein said base-processing means at said base station includes means for processing message data for particular remote units with a selected chip code.

Claim 47

The spread-spectrum CDMA communications method as set forth in claim 36 wherein the step of detecting includes: generating a message-chip-code signal with a chip-codeword corresponding to the remote unit; mixing the message-chip-code signal with a received base-combined-spread-spectrum signal; filtering the detected spread-spectrum signal; and detecting base-message data in the detected spread-spectrum signal.

Claim 48

The spread-spectrum CDMA communications method as set forth in claim 36 wherein the step of detecting includes: matched filtering with an impulse response matched to a message-chip-code signal used at said base station; and detecting base-message data after the step of matched filtering.