US6370182B2
Expired / Lapsed
US
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Integrated beamforming/rake/mud CDMA receiver architecture
Assignee: Harris Corp
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Filing: 2001-02-08
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Granted: 2002-04-09
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Expires: 2021-02-08
Abstract
Abstract A spread-spectrum demodulator architecture is presented which utilizes parallel processing to accomplish rapid signal acquisition with simultaneous tracking of multiple channels, while implementing an integrated multi-element adaptive beamformer, Rake combiner, and multi-user detector (MUD). A matched filter computational architecture is utilized, in which common digital arithmetic elements are used for both acquisition and tracking purposes. As each channel is sequentially acquired by the parallel matched filter, a subset of the arithmetic elements are then dedicated to the subsequent tracking of that channel. Additionally, multiple data inputs and delay lines are present, connecting the sampled baseband data streams of numerous RF bands and antenna elements with the arithmetic elements. The matched filter/despreader processing is virtually independent of channel origin or utilization; e.g., CDMA users, RF bands, beamformer elements, or Rake Fingers. Integration of the beamformer weighting computation with the demodulator results in substantial savings by sharing the existing circuitry performing carrier tracking and AGC. An optimal demodulator solution can be achieved through unified “space/time” processing, by providing all observables (element snapshots, Rake Fingers, carrier/symbol SNR/phase, etc.), for multiple channels, to a single adaptive algorithm processor that can beamform, Rake, and perform joint detection (MUD).
Inventors
- 👤 Scott Bierly
- 👤 Marc Harlacher
- 👤 Robert Smarrelli
- 👤 Aaron Weinberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:19
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/7073; H04B1/7075; H04B1/708; H04B1/709; H04B1/7093; H04B1/7097; H04B1/711; H04B1/7115; H04B1/7117; H04B2001/70706; H04B2201/00; H04B2201/69; H04B2201/707; H04B2201/70707; H04B2201/7071
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
150 words
A multiple frequency band, multiple channel radio receiver comprising a front end circuitry, including multiple antenna elements, for providing complex base band samples for a plurality of frequency bands and multiple channels in digital format, a parallel digital matched filter in which common digital arithmetic elements are used for both acquisition and tracking purposes connected to said front end circuitry, said matched filter being arranged to perform a plurality of simultaneous correlations of received spread spectrum signals against selected replica offsets of a spreading sequence, said parallel digital matched filter providing N slices with M stages per slice and W bit data quantization, wherein N, M, W are integer, each slice being adapted to perform 1/N of the acquisition computation and then is handed off to become a dedicated tracking module for one channel, respectively, and an integrated multi-element adaptive digital beamformer combiner connected to said parallel digital matched filter.
Claim 2
Dependent Claim
150 words
A multiple frequency band, multiple channel radio receiver comprising a front end circuitry, including multiple antenna elements, for providing complex base band samples for a plurality of frequency bands and multiple channels in digital format, a parallel digital matched filter in which common digital arithmetic elements are used for both acquisition and tracking purposes connected to said front end circuitry, said matched filter being arranged to perform a plurality of simultaneous correlations of received spread spectrum signals against selected replica offsets of a spreading sequence, said parallel digital matched filter providing N slices with M stages per slice and W bit data quantization, wherein N, M, W are integer, each slice being adapted to perform 1/N of the acquisition computation and then is handed off to become a dedicated tracking module for one channel, respectively, and an integrated multi-element adaptive digital beamformer combiner connected to said parallel digital matched filter.
Claim 3
Dependent Claim
83 words
The multiple frequency band, multiple channel radio receiver defined in claim 1 wherein said matched filter includes an N*M stage data delay line composed of B distinct bands, each band being composed of E distinct elements of 2*W bits each and a single numerically controlled oscillator to serve as a control digital frequency source matched to the expected chipping rate of the incoming signal; wherein: E is the number of elements, B is the number of bands, where E and B are integer.
Claim 4
Dependent Claim
33 words
The multiple frequency band, multiple channel radio receiver defined in claim 1 including a Rake Combiner for mitigating the effects of multipath interference dominated communication channels connected to said parallel digital matched filter.
Claim 5
Dependent Claim
147 words
A multiple frequency band, multiple channel radio receiver comprising a front end circuitry, including multiple antenna elements, for providing complex base band samples for a plurality of frequency bands and multiple channels in digital format, a matched filter in which common digital arithmetic elements are used for both acquisition and tracking purposes connected to said front end circuitry, said matched filter being arranged to perform a plurality of simultaneous correlations of received spread spectrum signals against selected replica offsets of a spreading sequence, said parallel digital matched filter providing N slices with M stages per slice and W bit data quantization, wherein N, M, W are integer, each slice being adapted to perform 1/N of the acquisition computation and then is handed off to become a dedicated tracking module for one channel, respectively, and integrated multi-element adaptive digital beamformer and Rake Combiners connected to said matched filter.
Claim 6
Dependent Claim
147 words
A multiple frequency band, multiple channel radio receiver comprising a front end circuitry, including multiple antenna elements, for providing complex base band samples for a plurality of frequency bands and multiple channels in digital format, a matched filter in which common digital arithmetic elements are used for both acquisition and tracking purposes connected to said front end circuitry, said matched filter being arranged to perform a plurality of simultaneous correlations of received spread spectrum signals against selected replica offsets of a spreading sequence, said parallel digital matched filter providing N slices with M stages per slice and W bit data quantization, wherein N, M, W are integer, each slice being adapted to perform 1/N of the acquisition computation and then is handed off to become a dedicated tracking module for one channel, respectively, and integrated multi-element adaptive digital beamformer and Rake Combiners connected to said matched filter.
Claim 7
Dependent Claim
32 words
The multiple frequency band multiple channel radio receiver defined in claim 4 including a multi-channel demodulator connected to said matched filter for simultaneously processing all bands, elements and channels and Rake Fingers.
Claim 8
Dependent Claim
162 words
A multiple frequency band, multiple channel radio receiver comprising a front end circuitry, including multiple antenna elements, for providing complex base band samples for a plurality of frequency bands and multiple channels in digital format, a matched filter in which common digital arithmetic elements are used for both acquisition and tracking purposes connected to said front end circuitry, said matched filter being arranged to perform a plurality of simultaneous correlations of received spread spectrum signals against selected replica offsets of a spreading sequence, said parallel digital matched filter providing N slices with M stages per slice and W bit data quantization, wherein N, M, W are integer, each slice being adapted to perform 1/N of the acquisition computation and then is handed off to become a dedicated tracking module for one channel, respectively, including a multi-channel demodulator processor connected to said matched filter for simultaneously processing all bands, elements and channels, and to function as an integrated multi-element adaptive digital beamformer combiner.
Claim 9
Dependent Claim
162 words
A multiple frequency band, multiple channel radio receiver comprising a front end circuitry, including multiple antenna elements, for providing complex base band samples for a plurality of frequency bands and multiple channels in digital format, a matched filter in which common digital arithmetic elements are used for both acquisition and tracking purposes connected to said front end circuitry, said matched filter being arranged to perform a plurality of simultaneous correlations of received spread spectrum signals against selected replica offsets of a spreading sequence, said parallel digital matched filter providing N slices with M stages per slice and W bit data quantization, wherein N, M, W are integer, each slice being adapted to perform 1/N of the acquisition computation and then is handed off to become a dedicated tracking module for one channel, respectively, including a multi-channel demodulator processor connected to said matched filter for simultaneously processing all bands, elements and channels, and to function as an integrated multi-element adaptive digital beamformer combiner.
Claim 10
Dependent Claim
34 words
The multiple frequency band, multiple channel radio receiver defined in claim 6 wherein said multi-channel demodulator processor includes a defragmentation module to insure the maximum acquisition capability of said receiver is maintained over time.
Claim 11
Dependent Claim
46 words
The multiple frequency band, multiple channel radio receiver defined in claim 6 including a single clocking system synchronous to a data sampling clock for generating G independent NCO/PN-generators that produce PN chipping sequences whose average rates can precisely track the various received signal chipping rates, respectively.
Claim 12
Dependent Claim
39 words
The multiple frequency band, multiple channel radio receiver defined in claim 6 wherein said multi-channel demodulator processor is adapted to form a completely independent set of beams on each single channel on each Rake Finger of each signal channel.
Claim 13
Dependent Claim
42 words
The multiple frequency band, multiple channel radio receiver defined in claim 6 wherein as each channel is sequentially acquired by said matched filter, and said demodulator processor assures that common digital arithmetic elements are used both for acquisition and tracking purposes, respectively.
Claim 14
Dependent Claim
50 words
The multiple frequency band, multiple channel radio receiver defined in claim 6 wherein multiple data inputs and delay lines are present and are available for processing at each arithmetic element so that the matched filter/despreader processing is virtually independent of channel origin (e.g. CDMA users, beamform element, or Rake Fingers).
Claim 15
Dependent Claim
24 words
The multiple frequency band, multiple channel radio receiver defined in claim 6 wherein there is a common NCO/PN-generator within a common beamformer element set.
Claim 16
Dependent Claim
162 words
A multiple frequency band, multiple channel radio receiver comprising a front end circuitry, including multiple antenna elements, for providing complex base band samples for a plurality of frequency bands and multiple channels in digital format, a parallel digital matched filter in which common digital arithmetic elements are used for both acquisition and tracking purposes connected to said front end circuitry, said matched filter being arranged to perform a plurality of simultaneous correlations of received spread spectrum signals against selected replica offsets of a spreading sequence, said parallel digital matched filter providing N slices with M stages per slice and W bit data quantization, wherein N, M, W are integer, each slice being adapted to perform 1/N of the acquisition computation and then is handed off to become a dedicated tracking module for one channel, respectively, including a multi-channel demodulator processor connected to said matched filter for simultaneously processing all bands, elements and channels, and to function as an integrated multi-element multi-user detector.
Claim 17
Dependent Claim
162 words
A multiple frequency band, multiple channel radio receiver comprising a front end circuitry, including multiple antenna elements, for providing complex base band samples for a plurality of frequency bands and multiple channels in digital format, a parallel digital matched filter in which common digital arithmetic elements are used for both acquisition and tracking purposes connected to said front end circuitry, said matched filter being arranged to perform a plurality of simultaneous correlations of received spread spectrum signals against selected replica offsets of a spreading sequence, said parallel digital matched filter providing N slices with M stages per slice and W bit data quantization, wherein N, M, W are integer, each slice being adapted to perform 1/N of the acquisition computation and then is handed off to become a dedicated tracking module for one channel, respectively, including a multi-channel demodulator processor connected to said matched filter for simultaneously processing all bands, elements and channels, and to function as an integrated multi-element multi-user detector.
Claim 18
Dependent Claim
83 words
The multiple frequency band, multiple channel radio receiver defined in claim 13 wherein said matched filter includes an N*M stage data delay line composed of B distinct bands, each band being composed of E distinct elements of 2*W bits each and a single numerically controlled oscillator to serve as a control digital frequency source matched to the expected chipping rate of the incoming signal; wherein: E is the number of elements, B is the number of bands, where E and B are integer.
Claim 19
Dependent Claim
33 words
The multiple frequency band, multiple channel radio receiver defined in claim 13 including a Rake Combiner for mitigating the effects of multipath interference dominated communication channels connected to said parallel digital matched filter.
Claim 20
Dependent Claim
32 words
The multiple frequency band multiple channel radio receiver defined in claim 15 including a multi-channel demodulator connected to said matched filter for simultaneously processing all bands, elements and channels and Rake Fingers.
Claim 21
Dependent Claim
34 words
The multiple frequency band, multiple channel radio receiver defined in claim 16 wherein said multi-channel demodulator processor includes a defragmentation module to insure the maximum acquisition capability of said receiver is maintained over time.
Claim 22
Dependent Claim
46 words
The multiple frequency band, multiple channel radio receiver defined in claim 13 including a single clocking system synchronous to a data sampling clock for generating G independent NCO/PN-generators that produce PN chipping sequences whose average rates can precisely track the various received signal chipping rates, respectively.
Claim 23
Dependent Claim
39 words
The multiple frequency band, multiple channel radio receiver defined in claim 13 wherein said multi-channel demodulator processor is adapted to form a completely independent set of beams on each single channel on each Rake Finger of each signal channel.
Claim 24
Dependent Claim
42 words
The multiple frequency band, multiple channel radio receiver defined in claim 13 wherein as each channel is sequentially acquired by said matched filter, and said demodulator processor assures that common digital arithmetic elements are used both for acquisition and tracking purposes, respectively.
Claim 25
Dependent Claim
50 words
The multiple frequency band, multiple channel radio receiver defined in claim 13 wherein multiple data inputs and delay lines are present and are available for processing at each arithmetic element so that the matched filter/despreader processing is virtually independent of channel origin (e.g. CDMA users, beamform element, or Rake Fingers).
Claim 26
Dependent Claim
24 words
The multiple frequency band, multiple channel radio receiver defined in claim 13 wherein there is a common NCO/PN-generator within a common beamformer element set.
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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) | 2005-04-08 | 2005-10-08 | 2006-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-04-08 | 2009-10-08 | 2010-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-04-08 | 2013-10-08 | 2014-04-09 | $7700.00 | Window Closed / Lapsed |