Joint Source Channel Soft Decoding Using Dynamic Redundancy Detection

Multimedia transmission over error-prone channels such as wireless channels has recently motivated the research on the joint source-channel (de)coding (JSCC, JSCD)technique. In this paper, we present a new JSCD method, which extends the joint area to the process of demodulation soft decision to enlarge the application fields of JSCD. The proposed method designs a technique of dynamic source redundancy detection and generalizes the Viterbi algorithm in a TDM system with scrambler. Simulation results show that our new method can obtain substantial improvements with a minor increasing of complexity, especially in the bad channel environment. For a TDM system with 30% occupied slots, the gain in SNR is around 4.4dB when SER reaches 10^-2.