Iterative decoding systems using noise-biasing

摘要

Systems, methods, and apparatus are provided for improving the iterative decoding performance of a decoder, for example, as used in a wireless communications receiver or in a data retrieval unit. A decoding technique may receive and process a set of channel samples using an iterative decoder. If the iterative decoder output indicates a decoding failure, noise samples may be combined with the received channel samples to create biased channel samples. Noise samples may be generated using a pseudo-random noise generator and/or by using signals already present in the communications receiver or data retrieval unit. The biased channel samples may be provided to the iterative decoder and the iterative decoder may re-run using the biased channel samples.

主权项

1. A method comprising:
receiving channel samples; receiving a set of noise samples; combining the channel samples with the set of noise samples to obtain a first set of biased channel samples; processing the first set of biased channel samples using an iterative decoder to obtain output samples of the iterative decoder; determining if iterative decoding failed based on the output samples; and in response to a determination that the iterative decoding failed:
permuting the set of noise samples and combining the channel samples with the permuted set of noise samples to obtain a second set of biased channel samples; andre-running the iterative decoder using the second set of biased channel samples.