Integrated beamforming/rake/mud CDMA receiver architecture
First Claim
1. 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.
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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).
96 Citations
22 Claims
- 1. 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.
- 4. 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.
- 6. 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.
- 13. 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.
Specification