Patent US5016255A successfully refreshed from Google Patents.
US5016255A
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Asymmetric spread spectrum correlator
Assignee: Intel Corp
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Filing: 1989-08-07
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Granted: 1991-05-14
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Expires: 2009-08-07
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 reference-sequence-storage device holds a reference-pseudo-noise signal, and a receive-sequence storage device holds a received spread spectrum signal. A chip comparator adds each chip of the received spread spectrum signal by each respective chip of the pseudo-noise signal, thereby generating a plurality of chip comparison signals. A summer adds the plurality of chip comparison signals, generating a correlation signal. The comparator compares the correlation signal to a statistically predetermined threshold level, and generates a first data-symbol signal.
Inventors
- 👤 Robert C. Dixon
- 👤 Jeffrey S. Vanderpool
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:23
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/709; H04B1/7093
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
179 words
An apparatus for decoding a received spread spectrum signal having a data signal modulated with a PN code, comprising: threshold setting means for analyzing the pattern and application of the data signal, noise environment, and amount of error correction, and determining a threshold level; reference-sequence-storage means for storing a reference pseudo-noise signal; receive-sequence-storage means for storing the received spread spectrum signal; chip-comparison means coupled to said reference-sequence-storage means and said receive-sequence-storage means, and responsive to the received spread spectrum signal for comparing each chip of the received spread spectrum signal with each respective chip of the reference pseudo-noise signal to generate a plurality of chip-comparison signals; summer means coupled to said chip-comparison means and responsive to the plurality of chip-comparison signals for adding the plurality of chip-comparison signals to generate a correlation signal; and correlation-comparison means coupled to said summer means and responsive to the correlation signal being greater than the threshold level for generating a first data symbol, and for generating a second data symbol in response to the correlation signal not being greater than the threshold level.
Claim 2
Independent Claim
179 words
An apparatus for decoding a received spread spectrum signal having a data signal modulated with a PN code, comprising: threshold setting means for analyzing the pattern and application of the data signal, noise environment, and amount of error correction, and determining a threshold level; reference-sequence-storage means for storing a reference pseudo-noise signal; receive-sequence-storage means for storing the received spread spectrum signal; chip-comparison means coupled to said reference-sequence-storage means and said receive-sequence-storage means, and responsive to the received spread spectrum signal for comparing each chip of the received spread spectrum signal with each respective chip of the reference pseudo-noise signal to generate a plurality of chip-comparison signals; summer means coupled to said chip-comparison means and responsive to the plurality of chip-comparison signals for adding the plurality of chip-comparison signals to generate a correlation signal; and correlation-comparison means coupled to said summer means and responsive to the correlation signal being greater than the threshold level for generating a first data symbol, and for generating a second data symbol in response to the correlation signal not being greater than the threshold level.
Claim 3
Dependent Claim
20 words
The apparatus as set forth in claim 1 wherein said reference-sequence-storage means and said receive-sequence-storage means includes a surface-acoustic-wave device.
Claim 4
Dependent Claim
20 words
The apparatus as set forth in claim 2 wherein said surface-acoustic-wave device includes said chip-comparison means and said summer means.
Claim 5
Independent Claim
153 words
An apparatus for demodulating a received spread spectrum signal having a data signal modulated with a PN code, comprising: threshold setting means for analyzing the pattern and application of the data signal and determining a threshold level; reference-sequence-storage means for storing a reference pseudo-noise signal; receive-sequence-storage means for storing the received spread spectrum signal; chip-comparison means coupled to said reference-sequence-storage means and said receive-sequence-storage means, and responsive to the received spread spectrum signal for comparing each chip of the received spread spectrum signal with each respective chip of the reference pseudo-noise signal to generate a plurality of chip-comparison signals; summer means coupled to said chip-comparison means and responsive to the plurality of chip-comparison signals for adding the plurality of chip-comparison signals to generate a correlation signal; and correlation-comparison means, coupled to said threshold setting means, and responsive to the correlation signal being greater than the threshold level for generating a first data-symbol signal.
Claim 6
Independent Claim
153 words
An apparatus for demodulating a received spread spectrum signal having a data signal modulated with a PN code, comprising: threshold setting means for analyzing the pattern and application of the data signal and determining a threshold level; reference-sequence-storage means for storing a reference pseudo-noise signal; receive-sequence-storage means for storing the received spread spectrum signal; chip-comparison means coupled to said reference-sequence-storage means and said receive-sequence-storage means, and responsive to the received spread spectrum signal for comparing each chip of the received spread spectrum signal with each respective chip of the reference pseudo-noise signal to generate a plurality of chip-comparison signals; summer means coupled to said chip-comparison means and responsive to the plurality of chip-comparison signals for adding the plurality of chip-comparison signals to generate a correlation signal; and correlation-comparison means, coupled to said threshold setting means, and responsive to the correlation signal being greater than the threshold level for generating a first data-symbol signal.
Claim 7
Dependent Claim
20 words
The apparatus as set forth in claim 4 wherein said reference-sequence-storage means and said receive-sequence-storage means includes a surface-acoustic-wave device.
Claim 8
Dependent Claim
20 words
The apparatus as set forth in claim 5 wherein said surface-acoustic-wave device includes said chip-comparison means and said summer means.
Claim 9
Independent Claim
106 words
An apparatus for decoding a received spread spectrum signal having a data signal modulated with a PN code, comprising: threshold setting means for setting a threshold level; reference-sequence-storage means for storing a reference pseudo-noise signal; receive-sequence-storage means for storing the received spread spectrum signal; chip-comparison means for comparing each chip of the received spread spectrum signal with each respective chip of the reference pseudo-noise signal to generate a plurality of chip-comparison signals; summer means for adding the plurality of chip-comparison signals to generate a correlation signal; and correlation-comparison means responsive to the correlation signal being greater than the threshold level for generating a first data-symbol signal.
Claim 10
Independent Claim
106 words
An apparatus for decoding a received spread spectrum signal having a data signal modulated with a PN code, comprising: threshold setting means for setting a threshold level; reference-sequence-storage means for storing a reference pseudo-noise signal; receive-sequence-storage means for storing the received spread spectrum signal; chip-comparison means for comparing each chip of the received spread spectrum signal with each respective chip of the reference pseudo-noise signal to generate a plurality of chip-comparison signals; summer means for adding the plurality of chip-comparison signals to generate a correlation signal; and correlation-comparison means responsive to the correlation signal being greater than the threshold level for generating a first data-symbol signal.
Claim 11
Dependent Claim
20 words
The apparatus as set forth in claim 7 wherein said reference-sequence-storage means and said receive-sequence-storage means include a surface-acoustic-wave device.
Claim 12
Dependent Claim
20 words
The apparatus as set forth in claim 8 wherein said surface-acoustic-wave device includes said chip-comparison means and said summer means.
Claim 13
Independent Claim
192 words
An apparatus for decoding a received spread spectrum signal having a data signal modulated with a PN code, comprising: threshold setting means for analyzing the pattern and application of the data signal, noise environment, and amount of error correction, and determining a threshold level; means for repetitively generating a plurality of reference pseudo-noise signals; reference-sequence-storage means for storing one of the reference pseudo-noise signals; receive-sequence-storage means for storing the received spread spectrum signal; chip-comparison means coupled to said reference-sequence-storage means and said receive-sequence-storage means, and responsive to the received spread spectrum signal for comparing each chip of the received spread spectrum signal with each respective chip of the reference pseudo-noise signal to generate a plurality of chip-comparison signals; summer means coupled to said chip-comparison means and responsive to the plurality of chip-comparison signals for adding the plurality of chip-comparison signals to generate a correlation signal; and correlation-comparison means coupled to and said summer means and responsive to the correlation signal being greater than the threshold level for generating a first data symbol, and for generating a second data symbol in response to the correlation signal not being greater than the threshold level.
Claim 14
Independent Claim
192 words
An apparatus for decoding a received spread spectrum signal having a data signal modulated with a PN code, comprising: threshold setting means for analyzing the pattern and application of the data signal, noise environment, and amount of error correction, and determining a threshold level; means for repetitively generating a plurality of reference pseudo-noise signals; reference-sequence-storage means for storing one of the reference pseudo-noise signals; receive-sequence-storage means for storing the received spread spectrum signal; chip-comparison means coupled to said reference-sequence-storage means and said receive-sequence-storage means, and responsive to the received spread spectrum signal for comparing each chip of the received spread spectrum signal with each respective chip of the reference pseudo-noise signal to generate a plurality of chip-comparison signals; summer means coupled to said chip-comparison means and responsive to the plurality of chip-comparison signals for adding the plurality of chip-comparison signals to generate a correlation signal; and correlation-comparison means coupled to and said summer means and responsive to the correlation signal being greater than the threshold level for generating a first data symbol, and for generating a second data symbol in response to the correlation signal not being greater than the threshold level.
Claim 15
Dependent Claim
20 words
The apparatus as set forth in claim 10 wherein said reference-sequence-storage means and said receive-sequence-storage means includes a surface-acoustic-wave device.
Claim 16
Dependent Claim
20 words
The apparatus as set forth in claim 11 wherein said surface-acoustic-wave device includes said chip-comparison means and said summer means.
Claim 17
Independent Claim
97 words
A method using a correlator for decoding a received spread spectrum signal having a data signal modulated with a PN code, comprising the steps, using said correlator, of: determining a threshold level; storing a reference pseudo-noise signal; storing the received spread spectrum signal; comparing each chip of the received spread spectrum signal with each respective chip of the reference pseudo-noise signal to generate a plurality of chip-comparison signals; adding the plurality of chip-comparison signals to generate a correlation signal; and generating a first data symbol in response to the correlation signal being greater than the threshold level.
Claim 18
Independent Claim
97 words
A method using a correlator for decoding a received spread spectrum signal having a data signal modulated with a PN code, comprising the steps, using said correlator, of: determining a threshold level; storing a reference pseudo-noise signal; storing the received spread spectrum signal; comparing each chip of the received spread spectrum signal with each respective chip of the reference pseudo-noise signal to generate a plurality of chip-comparison signals; adding the plurality of chip-comparison signals to generate a correlation signal; and generating a first data symbol in response to the correlation signal being greater than the threshold level.
Claim 19
Independent Claim
107 words
A method using a correlator for decoding a received spread spectrum signal having a data signal modulated with a PN code, comprising the steps, using said correlator, of: determining a threshold level; generating repetitively a plurality of reference pseudo-noise signals; storing one of the reference pseudo-noise signals; storing the received spread spectrum signal; comparing each chip of the received spread spectrum signal with each respective chip of the reference pseudo-noise signal to generate a plurality of chip-comparison signals; adding the plurality of chip-comparison signals to generate a correlation signal; and generating a first data symbol in response to the correlation signal being greater than the threshold level.
Claim 20
Independent Claim
107 words
A method using a correlator for decoding a received spread spectrum signal having a data signal modulated with a PN code, comprising the steps, using said correlator, of: determining a threshold level; generating repetitively a plurality of reference pseudo-noise signals; storing one of the reference pseudo-noise signals; storing the received spread spectrum signal; comparing each chip of the received spread spectrum signal with each respective chip of the reference pseudo-noise signal to generate a plurality of chip-comparison signals; adding the plurality of chip-comparison signals to generate a correlation signal; and generating a first data symbol in response to the correlation signal being greater than the threshold level.
Claim 21
Independent Claim
94 words
A method, using a correlator, for decoding a received spread spectrum signal having a data signal modulated using a PN code, comprising the steps of: determining a detection threshold level; generating a correlation signal representing the degree of match between the received spread spectrum signal and a reference pseudo-noise signal corresponding to said PN code; and generating, at selected clock times, a first data symbol dependent upon a comparison of said correlation signal and said threshold level, and a second data symbol at said clock times when said first data symbol is not generated.
Claim 22
Independent Claim
94 words
A method, using a correlator, for decoding a received spread spectrum signal having a data signal modulated using a PN code, comprising the steps of: determining a detection threshold level; generating a correlation signal representing the degree of match between the received spread spectrum signal and a reference pseudo-noise signal corresponding to said PN code; and generating, at selected clock times, a first data symbol dependent upon a comparison of said correlation signal and said threshold level, and a second data symbol at said clock times when said first data symbol is not generated.
Claim 23
Independent Claim
99 words
An apparatus, using a correlator, for decoding a received spread spectrum signal having a data signal modulated using a PN code, comprising: means for determining a detection threshold level; means for generating a correlation signal representing the degree of match between the received spread spectrum signal and a reference pseudo-noise signal corresponding to said PN code; and means for generating, at selected clock times, a first data symbol signal dependent upon a comparison of said correlation signal and said threshold level, and a second data symbol signal at said clock times when said first data symbol is not generated.
Claim 24
Independent Claim
99 words
An apparatus, using a correlator, for decoding a received spread spectrum signal having a data signal modulated using a PN code, comprising: means for determining a detection threshold level; means for generating a correlation signal representing the degree of match between the received spread spectrum signal and a reference pseudo-noise signal corresponding to said PN code; and means for generating, at selected clock times, a first data symbol signal dependent upon a comparison of said correlation signal and said threshold level, and a second data symbol signal at said clock times when said first data symbol is not generated.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-13 | 1994-11-12 | 1995-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-13 | 1998-11-12 | 1999-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-13 | 2002-11-12 | 2003-05-14 | $7700.00 | Window Closed / Lapsed |