Soft-bit generation and channel estimation for interference cancellation using decoder output

摘要

Log-likelihood ratios produced by a decoder are incorporated into a soft symbol to soft bit estimation process and are used to perform improved channel estimation and impairment covariance estimation. In an example method, a plurality of soft bits and corresponding probability metrics for a series of received unknown symbols are generated. Estimates of the received unknown information symbols are then regenerated, as a function of the soft bits and corresponding probability metrics. An estimate of the average amplitude of the received unknown information symbols, or an estimate of the propagation channel response experienced by the received unknown information symbols, or both, are calculated, as a function of the regenerated symbol estimates. The results are applied to produce demodulated symbols for a second decoding iteration for the series of received unknown symbols.

主权项

1. A method, in a communications receiver, the method comprising:
in a first decoding iteration for a series of received unknown information symbols, generating a plurality of soft bits and corresponding probability metrics, the plurality of soft bits corresponding to the series of received unknown information symbols; regenerating estimates of the received unknown information symbols as a function of the soft bits and corresponding probability metrics; calculating an estimate of the average amplitude of the received unknown information symbols, or calculating an estimate of the propagation channel response experienced by the received unknown information symbols, or both, as a function of the regenerated estimates of the received unknown information symbols; applying the calculated estimate of the average amplitude of the received unknown information symbols, or the estimate of the propagation channel response, or both, to produce demodulated symbols for a second decoding iteration for the series of received unknown information symbols.