Adaptive Combined Source and Channel Decoding with Modulation for Rayleigh Fading Channels
In this paper, an adaptive system employing combined source and channel decoding with modulation is proposed for slow Rayleigh fading channels. Huffman code is used as the source code and Convolutional code is used for error control. The adaptive scheme employs a family of Convolutional codes of different rates and Multiple Phase Shift Keying (MPSK) modulation schemes according to the states of the channel. It also uses a channel estimator to select the most appropriate codulation scheme. Simulation results show that the adaptive scheme gives significant improvement in the BER and throughput performance as compared to fixed error codes.