Joint source-channel decoding with source sequence augmentation

摘要

Methods and systems for augmenting a source message by suitably-chosen bits and/or sequences of bits for the purpose of enhancing decoding or synchronization performance. Properties of the source message can be used to select and optimize synchronization sequences, including their length and placement within the source message. Various message attributes, such as message or segment weight, symbol counts, and others, including their combinations, may be encoded into the synchronization sequence to further improve decoding performance in the presence of errors. These methods and systems can be employed for standalone source decoding of noisy bit streams, as well as iterative joint source-channel decoding. They may further be combined with other methods whether or not known in the art, such as CRC and forward error correction, to achieve the desired performance complexity trade-off.

主权项

1. A system for augmenting a source message bit sequence with a synchronization sequence to facilitate better source decoding, the system comprising:
a source message bit sequence; a source encoder, wherein said source encoder inserts at least one synchronization sequence into the source message bit sequence to create an encoded source message bit sequence and jointly decodes the encoded source message bit sequence, wherein the decoding of the encoded source message bit sequence is based on the at least one synchronization sequence, the at least one synchronization sequence being selected from a set of at least two defined synchronization sequences, the selection based on one or more characteristics of the source message bit sequence, said characteristics comprising weight modulo-q of the source message bit sequence, said weight modulo-q of the source message bit sequence corresponding to the remainder of the weight of the source message bit sequence divided by q, said weight corresponding to the number of bits in the source message bit sequence equal to 1; and a transmitter, wherein said transmitter transmits the source message bit sequence containing said at least one synchronization sequence.