US7139960B2

5G,4G,3G

Title

Error-correcting multi-stage code generator and decoder for communication systems having single transmitters or multiple transmitters

Application Number:

US20040960790

Publication Date:

21-11-2006

Current Assignee:

QUALCOMM INC

Family ID:

34434966

Application Date:

06-10-2004

Publication Country:

US

View on Espacenet

Priority Date:

06-10-2003

Declaring Company:

QUALCOMM INC

Abstract  Abstract

A communications system includes an encoder that produces a plurality of redundant symbols. For a given key an output symbol is generated from a combined set of symbols including the input symbols and the redundant symbols. The output symbols are generally independent of each other and an effectively unbounded number of output symbols can be generated if needed. Received output symbols can provide probabilistic information for error correction. A decoder calculates check symbols from the output symbols received. For each received output symbol the decoder updates a running total of estimated information content and in one or more rounds generates a probability distribution for each input symbol over all or some of possible values. This process may be repeated until for all of the input symbols one of the many possible values is much more probable than others or the process may be repeated a predetermined number of rounds or other criteria is met.

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