Joint decoding of turbo code and AMR-WB vocoder in 3GPP LTE system

A new joint source and channel decoding algorithm for forth generation wireless systems is proposed. The fact that only part of the information sequence are source bits and have residual redundancy that can be used for joint decoding is taken into account. The goal of the algorithm is the correct reception of the correlated bits using joint and list decoders, after that correctly decoded values are used for improvement of non correlated bits. Performance of the new decoder is shown for 3GPP LTE turbo code and AMR-WB vocoder, but can be applied to other sources. The gain that is achieved by the new decoder comparing to the conventional turbo scheme is 0.15 dB, that is equal to 0.4-0.15 MOS speech quality improvement.