Performance analysis of Multi Stream Single Code SCM-OFDM in mobile communication system

This paper is concerned with the performance analysis of a Multi Stream Single Code Superposition Coded Modulation Orthogonal Frequency Division Multiplexing (MS-SC-SCM-OFDM) communication system. A simple Chip-By-Chip (CBC) iterative Multi User Detection (MUD) strategy is used in MS-SC-SCM-OFDM system. Saleh model is used as a High Power Amplifier (HPA), the system performance has been studied over AWGN, Jack fading and Rician channels. The goal of this paper is to reduce the number of the encoders and decoders for low design complexity and low bit error degradation. In case of double layer, the performance of Multi Code SCM-OFDM is better than the SC-SCM-OFDM system by only 0.5 dB. For complexity analysis, the multi code system uses two convolutional encoders and two viterbi decoders, while, for the single code system, only one encoder and one decoder are used. Finally, the single code SCM-OFDM is better than multi code SCM-OFDM by 50% complexity.