Patent EP0221592A2 successfully refreshed from Google Patents.
Patent US5499265A successfully refreshed from Google Patents.
US5499265A
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US
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Spread spectrum correlator
Assignee: Intel Corp
•
Filing: 1994-03-21
•
Granted: 1996-03-12
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Expires: 2014-03-21
Abstract
Abstract An apparatus for decoding a received spread spectrum signal having a data signal modulated with a pseudo-noise code and transmitted as an RF spread spectrum signal. A first reference register holds a first pseudo-noise signal, a second reference register holds a second pseudo-noise signal, and a receive-register holds a received spread spectrum signal. A first modulo adder adds each chip of the received spread spectrum signal with each respective chip of the first pseudo-noise signal, thereby generating a first plurality of chip-comparison signals. A first summer adds the first plurality of chip-comparison signals, generating a first correlation signal. The comparator compares the correlation signal to an upper-threshold level and a lower-threshold level, and respectively generates a first data-symbol signal or a second data-symbol signal.
Inventors
- 👤 Robert C. Dixon
- 👤 Jeffrey S. Vanderpool
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:29
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/709
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
162 words
Apparatus for decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with the entirety of a pseudo-noise code, said apparatus comprising a plurality of receiving registers capable of storing a received spread spectrum signal comprising a first plurality of chips, a plurality of reference registers capable of storing an entire pseudo-noise code comprising a second plurality of chips, a plurality of adders, each of said adders connected to one of said plurality of receiving registers and one of said plurality of reference registers, each of said adders having an output connected to a summer, said summer outputting a correlation signal, and a data generator responsive to said correlation signal, generating, at selected clock times, a first data symbol in response to a comparison of said correlation signal and a first predetermined threshold level, and a second data symbol at said clock times in response to a comparison of said correlation signal and a second predetermined threshold level.
Claim 2
Dependent Claim
162 words
Apparatus for decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with the entirety of a pseudo-noise code, said apparatus comprising a plurality of receiving registers capable of storing a received spread spectrum signal comprising a first plurality of chips, a plurality of reference registers capable of storing an entire pseudo-noise code comprising a second plurality of chips, a plurality of adders, each of said adders connected to one of said plurality of receiving registers and one of said plurality of reference registers, each of said adders having an output connected to a summer, said summer outputting a correlation signal, and a data generator responsive to said correlation signal, generating, at selected clock times, a first data symbol in response to a comparison of said correlation signal and a first predetermined threshold level, and a second data symbol at said clock times in response to a comparison of said correlation signal and a second predetermined threshold level.
Claim 3
Dependent Claim
161 words
Apparatus for decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with the entirety of a code, said apparatus comprising a plurality of receiving registers capable of storing a received spread spectrum signal comprising a first plurality of chips, a plurality of reference registers capable of storing an entire pseudo-noise code comprising a second plurality of chips, a plurality of adders, each of said adders connected to one of said plurality of receiving registers and one of said plurality of reference registers, each of said adders having an adder output, a summer having inputs connected to said adder outputs, said summer outputting a correlation signal, and a data generator responsive to said correlation signal, whereby a first data symbol is generated in response to a comparison of said correlation signal with a first threshold level, and a second data symbol is generated in response to a comparison of said correlation signal with a second threshold level.
Claim 4
Dependent Claim
161 words
Apparatus for decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with the entirety of a code, said apparatus comprising a plurality of receiving registers capable of storing a received spread spectrum signal comprising a first plurality of chips, a plurality of reference registers capable of storing an entire pseudo-noise code comprising a second plurality of chips, a plurality of adders, each of said adders connected to one of said plurality of receiving registers and one of said plurality of reference registers, each of said adders having an adder output, a summer having inputs connected to said adder outputs, said summer outputting a correlation signal, and a data generator responsive to said correlation signal, whereby a first data symbol is generated in response to a comparison of said correlation signal with a first threshold level, and a second data symbol is generated in response to a comparison of said correlation signal with a second threshold level.
Claim 5
Dependent Claim
81 words
Apparatus for decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with the entirety of a code of length L, said apparatus comprising means for generating a correlation signal for L/2+1 or more chips of said spread spectrum signal and L/2+1 or more chips of a signal corresponding to said code; and means for directly generating a plurality of data symbols in response to a comparison of said correlation signal with a plurality of threshold levels.
Claim 6
Dependent Claim
81 words
Apparatus for decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with the entirety of a code of length L, said apparatus comprising means for generating a correlation signal for L/2+1 or more chips of said spread spectrum signal and L/2+1 or more chips of a signal corresponding to said code; and means for directly generating a plurality of data symbols in response to a comparison of said correlation signal with a plurality of threshold levels.
Claim 7
Dependent Claim
71 words
Apparatus for decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with a code of length L, said apparatus comprising means for generating a correlation signal for said spread spectrum signal and a signal corresponding to said code; and means for directly generating a data signal in response to said correlation signal, said data signal comprising one data bit for each L chips in said code.
Claim 8
Dependent Claim
71 words
Apparatus for decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with a code of length L, said apparatus comprising means for generating a correlation signal for said spread spectrum signal and a signal corresponding to said code; and means for directly generating a data signal in response to said correlation signal, said data signal comprising one data bit for each L chips in said code.
Claim 9
Dependent Claim
62 words
Apparatus for decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with a code, said apparatus comprising means for generating a correlation signal for said spread spectrum signal and a signal corresponding to said code; and means for generating a data signal in response to said correlation signal, without reference to a code preamble for said code.
Claim 10
Dependent Claim
62 words
Apparatus for decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with a code, said apparatus comprising means for generating a correlation signal for said spread spectrum signal and a signal corresponding to said code; and means for generating a data signal in response to said correlation signal, without reference to a code preamble for said code.
Claim 11
Dependent Claim
62 words
Apparatus for decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with a code, said apparatus comprising means for generating a correlation signal for said spread spectrum signal and a signal corresponding to said code; and means for generating a data signal in response to said correlation signal without reference to a synchronization signal for said code.
Claim 12
Dependent Claim
62 words
Apparatus for decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with a code, said apparatus comprising means for generating a correlation signal for said spread spectrum signal and a signal corresponding to said code; and means for generating a data signal in response to said correlation signal without reference to a synchronization signal for said code.
Claim 13
Dependent Claim
67 words
Apparatus for decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with a code, said apparatus comprising means for generating a correlation signal for said spread spectrum signal and a signal corresponding to said code; and means for generating a data signal in response to said correlation signal, without reference to either a synchronization signal or a code preamble for said code.
Claim 14
Dependent Claim
67 words
Apparatus for decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with a code, said apparatus comprising means for generating a correlation signal for said spread spectrum signal and a signal corresponding to said code; and means for generating a data signal in response to said correlation signal, without reference to either a synchronization signal or a code preamble for said code.
Claim 15
Independent Claim
142 words
A method of decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with the entirety of a pseudo-noise code having a length of L chips, said method comprising the steps of: receiving and storing said spread spectrum signal, generating and storing a reference signal corresponding to at least L/2+1 chips of said pseudo-noise code, comparing each chip of said spread spectrum signal with a corresponding chip of said reference signal, generating a correlation signal representing a degree of match between said spread spectrum signal and said reference signal, and generating, at selected clock times, a first data symbol in response to a comparison of said correlation signal and a first predetermined threshold level, and a second data symbol at said clock times in response to a comparison of said correlation signal and a second predetermined threshold level.
Claim 16
Independent Claim
142 words
A method of decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with the entirety of a pseudo-noise code having a length of L chips, said method comprising the steps of: receiving and storing said spread spectrum signal, generating and storing a reference signal corresponding to at least L/2+1 chips of said pseudo-noise code, comparing each chip of said spread spectrum signal with a corresponding chip of said reference signal, generating a correlation signal representing a degree of match between said spread spectrum signal and said reference signal, and generating, at selected clock times, a first data symbol in response to a comparison of said correlation signal and a first predetermined threshold level, and a second data symbol at said clock times in response to a comparison of said correlation signal and a second predetermined threshold level.
Claim 17
Independent Claim
135 words
A method of decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with the entirety of a code having a length of L chips, said method comprising the steps of receiving and storing said spread spectrum signal, generating a reference signal corresponding to at least L/2+1 chips of said pseudo-noise code, adding each chip of said spread spectrum signal with a corresponding chip of said reference signal, and generating a plurality of chip comparison signals thereby, generating a correlation signal by adding an output of each of said chip comparison signals, and generating a first data symbol in response to a comparison of said correlation signal with a first threshold level, and a second data symbol in response to a comparison of said correlation signal with a second threshold level.
Claim 18
Independent Claim
135 words
A method of decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with the entirety of a code having a length of L chips, said method comprising the steps of receiving and storing said spread spectrum signal, generating a reference signal corresponding to at least L/2+1 chips of said pseudo-noise code, adding each chip of said spread spectrum signal with a corresponding chip of said reference signal, and generating a plurality of chip comparison signals thereby, generating a correlation signal by adding an output of each of said chip comparison signals, and generating a first data symbol in response to a comparison of said correlation signal with a first threshold level, and a second data symbol in response to a comparison of said correlation signal with a second threshold level.
Claim 19
Independent Claim
80 words
A method of decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with the entirety of a code of length L, comprising the steps of comparing L/2+1 or more chips of said spread spectrum signal with L/2+1 or more chips of a signal corresponding to said code, and generating a correlation signal thereby, directly generating a plurality of data symbols in response to a comparison of said correlation signal with a plurality of threshold levels.
Claim 20
Independent Claim
80 words
A method of decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with the entirety of a code of length L, comprising the steps of comparing L/2+1 or more chips of said spread spectrum signal with L/2+1 or more chips of a signal corresponding to said code, and generating a correlation signal thereby, directly generating a plurality of data symbols in response to a comparison of said correlation signal with a plurality of threshold levels.
Claim 21
Independent Claim
71 words
A method for decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with a code of length L, said method comprising the steps of generating a correlation signal for said spread spectrum signal and a signal corresponding to said code, and directly generating a data signal in response to said correlation signal, said data signal comprising one data bit for each L chips in said code.
Claim 22
Independent Claim
71 words
A method for decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with a code of length L, said method comprising the steps of generating a correlation signal for said spread spectrum signal and a signal corresponding to said code, and directly generating a data signal in response to said correlation signal, said data signal comprising one data bit for each L chips in said code.
Claim 23
Independent Claim
65 words
A method of decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with a code of length L, said method comprising the steps of generating a correlation signal for said spread spectrum signal and a signal corresponding to said code; and generating a data signal in response to said correlation signal, without reference to a code preamble for said code.
Claim 24
Independent Claim
65 words
A method of decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with a code of length L, said method comprising the steps of generating a correlation signal for said spread spectrum signal and a signal corresponding to said code; and generating a data signal in response to said correlation signal, without reference to a code preamble for said code.
Claim 25
Independent Claim
63 words
A method of decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with the entirety of a code, comprising the steps of generating a correlation signal for said spread spectrum signal and a signal corresponding to said code, and generating a data signal in response to said correlation signal, without reference to a synchronization signal for said code.
Claim 26
Independent Claim
63 words
A method of decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with the entirety of a code, comprising the steps of generating a correlation signal for said spread spectrum signal and a signal corresponding to said code, and generating a data signal in response to said correlation signal, without reference to a synchronization signal for said code.
Claim 27
Independent Claim
67 words
A method of decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with a code, said method comprising the steps of generating a correlation signal for said spread spectrum signal and a signal corresponding to said code, and generating a data signal in response to said correlation signal, without reference to either a synchronization signal or a code preamble for said code.
Claim 28
Independent Claim
67 words
A method of decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with a code, said method comprising the steps of generating a correlation signal for said spread spectrum signal and a signal corresponding to said code, and generating a data signal in response to said correlation signal, without reference to either a synchronization signal or a code preamble for said code.
Claim 29
Dependent Claim
213 words
Apparatus for decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with the entirety of a pseudo-noise code, said apparatus comprising a receiving register comprising a first plurality of stages wherein a first plurality of chips from an incoming signal are received and stored, a reference register comprising a second plurality of stages wherein a second plurality of chips corresponding to a pseudo-noise code are stored, a plurality of adders, each of said adders connected to one of said first plurality of stages and a corresponding one of said second plurality of stages, a summer connected to an output of each of said adders, a threshold setting circuit having as outputs a first threshold signal and a second threshold signal, a first comparator having a first input connected to said summer and a second input to said first threshold signal, and outputting a first comparison signal, a second comparator having a first input connected to said summer and a second input to said second threshold signal, and outputting a second comparison signal, and a data generator responsive to said first and second comparison signals, outputting a first data symbol in response to said first comparison signal, and a second data symbol in response to said second comparison signal.
Claim 30
Dependent Claim
213 words
Apparatus for decoding a spread spectrum signal, said spread spectrum signal having a data signal modulated with the entirety of a pseudo-noise code, said apparatus comprising a receiving register comprising a first plurality of stages wherein a first plurality of chips from an incoming signal are received and stored, a reference register comprising a second plurality of stages wherein a second plurality of chips corresponding to a pseudo-noise code are stored, a plurality of adders, each of said adders connected to one of said first plurality of stages and a corresponding one of said second plurality of stages, a summer connected to an output of each of said adders, a threshold setting circuit having as outputs a first threshold signal and a second threshold signal, a first comparator having a first input connected to said summer and a second input to said first threshold signal, and outputting a first comparison signal, a second comparator having a first input connected to said summer and a second input to said second threshold signal, and outputting a second comparison signal, and a data generator responsive to said first and second comparison signals, outputting a first data symbol in response to said first comparison signal, and a second data symbol in response to said second comparison signal.
Claim 31
Dependent Claim
35 words
The apparatus of claim 15 further comprising a code generator capable of generating a plurality of pseudo-noise codes, from which one of said plurality of pseudo-noise codes is selected for storing in said reference register.
Claim 32
Dependent Claim
31 words
The apparatus of claim 16 further comprising a code selector connected to said code generator, whereby one of said plurality of pseudo-noise codes is selected for storing in said reference register.
Claim 33
Dependent Claim
30 words
The apparatus of claim 15 further comprising a counter coupled to a code clock generator, whereby said code clock generator controls loading of said pseudo-noise code into said reference register.
Claim 34
Dependent Claim
25 words
The apparatus of claim 3 wherein said correlation signal is generated for fewer than L but more than L/2+1 chips of said spread spectrum signal.
Claim 35
Dependent Claim
35 words
The method of claim 10 wherein said correlation signal is generated for a comparison of fewer than L but more than L/2+1 chips of said spread spectrum signal and said signal corresponding to said code.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1999-03-12 | 1999-09-11 | 2000-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-12 | 2003-09-11 | 2004-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-12 | 2007-09-11 | 2008-03-12 | $7700.00 | Window Closed / Lapsed |