Systems and methods for providing unequal error protection code design from probabilistically fixed composition codes

摘要

A method of encoding that uses standard codecs such as linear encoders and decoders for encoding and decoding data with different levels of robustness to errors is described. In one configuration, multiple encoders may be utilized, and one of the encoders may use a standard encoder such as a turbo code followed by a nonlinearity that creates an unequal distribution of ones and zeros in a binary representation of the code. In another configuration, a coder may be utilized that represents message outputs as “channels” that create state transitions (or symbol errors) in a data forward error correction coder.

主权项

1. A method for embedded unequal error protection encoding, comprising:
encoding first data, wherein a code that is used to encode the first data comprises a standard code followed by a nonlinearity that creates an unequal distribution of ones and zeros in a binary representation of the code, wherein codewords in the nonlinearity are chosen to be unequal and are also chosen to maximize an average Hamming distance between the codewords; encoding second data, wherein linear encoders are used to encode the first data and to encode the second data, and wherein the first data and the second data are encoded by the linear encoders so as to provide different levels of robustness to errors; and sending a signal that comprises the encoded first data and the encoded second data over a channel to a receiver.