An iterative approach to joint source-channel decoding of combined TCQ/CPM

摘要

An iterative soft decoding approach to joint source and channel coding using combined trellis coded quantization (TCQ) and continuous phase modulation (CPM) is proposed. This iterative procedure exploits the structure of the TCQ encoder and the continuous phase modulator. It is observed that the combined TCQ/CPM systems are both power and bandwidth efficient compared with the combined TCQ/TCM system. Based on extrinsic information density evolution, a convergence analysis of combined TCQ/CPM with iterative decoding is presented. The conventional convergence analysis techniques based on the uniform error property of geometrically uniform codes has been modified and generalized to the codes with a non-uniform error property.