Diversity receiver for signals with multipath time dispersion

Claim 2

A digital communications receiver, comprising: means for signal processing a plurality of diversity branches to produce complex receive data samples and synchronization information from received signals; means for forming channel tap estimates from said data samples and said synchronization information; means for forming weighting factors using said data samples, said channel tap estimates, and said synchronization information; means for pre-processing said data samples, said channel tap estimates, and said weighting factors to produce metric multipliers; and means for combining said metric multipliers with hypothesized data sequences to generate and accumulate metrics using a sequence estimation algorithm, producing a alemodulated data stream.

Claim 3

A receiver according to claim 1, wherein the signal processing means comprises: means for processing radio signals to produce complex data samples; and means for synchronizing said receiver using said complex data samples to produce timing information and initial channel tap estimates.

Claim 4

A receiver according to claim 2, wherein the signal processing means further comprises: means for storing said complex data samples.

Claim 5

A receiver according to claim 1, wherein the signal processing means comprises: means for processing radio signals to produce complex data samples; means for synchronizing said receiver using said complex data samples to produce timing information and channel model information; and means for decimating said complex data samples using sampling phases determined by said synchronizing.

Claim 6

A receiver according to claim 1, wherein the pre-processing means comprises: means for filtering each branch data sample stream using a bank of finite impulse response (FIR) filters and filter coefficients based on said channel tap estimates; and means for computing products and their sums using said channel tap estimates.

Claim 7

A digital communications receiver comprising: means for signal processing a plurality of diversity branches to produce complex receive data samples and synchronization information from received signals; means for forming time varying channel tap estimates from said data samples, said synchronization information, and tentative data detections produced by a combining means; means for foraging time-varying weighting factors using said data samples, said channel tap estimates, said synchronization information, and said tentative data detections; means for pre-processing said data samples, said channel tap estimates, and said weighting factors to produce metric multipliers; and said combining means for combining said metric multipliers with hypothesized data sequences to generate and accumulate metrics using a sequence estimation algorithm, producing a demodulated data stream.

Claim 8

A digital communications receiver comprising: means for signal processing a plurality of diversity branches to produce complex receive data samples and synchronization information from received signals; means for forming time varying channel tap estimates from said data samples, said synchronization information, and tentative data detections produced by a combining means; means for foraging time-varying weighting factors using said data samples, said channel tap estimates, said synchronization information, and said tentative data detections; means for pre-processing said data samples, said channel tap estimates, and said weighting factors to produce metric multipliers; and said combining means for combining said metric multipliers with hypothesized data sequences to generate and accumulate metrics using a sequence estimation algorithm, producing a demodulated data stream.

Claim 9

A receiver according to claim 6, wherein the signal processing means comprises: means for processing radio signals to produce complex data samples; and means for synchronizing said receiver using said complex data samples to produce timing information and initial channel model information.

Claim 10

A receiver according to claim 7, wherein the signal processing means further comprises: means for storing said complex dam samples.

Claim 11

A receiver according to claim 6, wherein the signal processing means comprises: means for processing radio signals to produce complex data samples; means for synchronizing said receiver using said complex data samples to produce timing information and initial channel model information; and means for decimating said complex data samples using sampling phases determined by said synchronizing.

Claim 12

A receiver according to claim 6, wherein the pre-processing means comprises: means for filtering each branch data sample stream using a bank of finite impulse response (FIR) filters and filter coefficients based on said channel estimates; and means for computing products and their sums using said channel estimates.

Claim 17

In an IS54-based Time Division Multiple Access digital communications system, a receiver comprising: means for signal processing a plurality of diversity branches to produce complex receive data samples and synchronization information from received signals; means for forming time-varying channel tap estimates from said data samples, said synchronization information, and tentative data detections produced by a combining means; means for forming time-varying weighting factors using said data samples, said channel tap estimates, said synchronization information, and said tentative data detections; means for pre-processing said data samples, said channel tap estimates, and said weighting factors to produce metric multipliers; and said combining means for combining said metric multipliers with hypothesized data sequences to generate and accumulate metrics using a sequence estimation algorithm, producing a demodulated data stream.

Claim 18

In an IS54-based Time Division Multiple Access digital communications system, a receiver comprising: means for signal processing a plurality of diversity branches to produce complex receive data samples and synchronization information from received signals; means for forming time-varying channel tap estimates from said data samples, said synchronization information, and tentative data detections produced by a combining means; means for forming time-varying weighting factors using said data samples, said channel tap estimates, said synchronization information, and said tentative data detections; means for pre-processing said data samples, said channel tap estimates, and said weighting factors to produce metric multipliers; and said combining means for combining said metric multipliers with hypothesized data sequences to generate and accumulate metrics using a sequence estimation algorithm, producing a demodulated data stream.

Claim 19

In an IS54-based Time Division Multiple Access digital communications system, a method for joint equalization and diversity combining in a digital communications receiver, comprising the steps of: signal processing a plurality of diversity branches to produce complex receive data samples and synchronization information from received signals; forming time-varying channel tap estimates from said data samples, said synchronization information, and tentative data detections produced by a processor; forming time-varying weighting factors using said data samples, said channel tap estimates, said synchronization information, and said tentative data detections; pre-processing said data samples, said channel tap estimates, and said weighting factors to produce metric multipliers; and combining said metric multipliers with hypothesized data sequences to generate and accumulate metrics using a sequence estimation algorithm, producing a demodulated data stream.

Claim 20

In an IS54-based Time Division Multiple Access digital communications system, a method for joint equalization and diversity combining in a digital communications receiver, comprising the steps of: signal processing a plurality of diversity branches to produce complex receive data samples and synchronization information from received signals; forming time-varying channel tap estimates from said data samples, said synchronization information, and tentative data detections produced by a processor; forming time-varying weighting factors using said data samples, said channel tap estimates, said synchronization information, and said tentative data detections; pre-processing said data samples, said channel tap estimates, and said weighting factors to produce metric multipliers; and combining said metric multipliers with hypothesized data sequences to generate and accumulate metrics using a sequence estimation algorithm, producing a demodulated data stream.