Sparse Code Multiple Access System Design for 5G Wireless Communications
Non-orthogonal multiple access(NOMA)has emerged as a promising technology for 5G systems,superseding the orthogonal frequency division multiple access(OFDMA)used in 4G.While OFDMA offers robust resistance to inter-carrier interference and channel fading,its low spectral efficiency limits support for massive connectivity.NOMA addresses 5G requirements for high-speed transmission and low latency while overcoming spectrum resource limitations.This study optimizes the time complexity of message passing algorithms at the receiver for NOMA systems.The proposed sparse code multiple access(SCMA)design demonstrates significant improvements over conventional spread spectrum techniques across key performance metrics,including bit error rate,spectral efficiency,user capacity,and bandwidth utilization.
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