Abstract
AbstractLow density signature for orthogonal frequency division multiplexing (LDS‐OFDM) is a promising technique for multiple accesses in wireless communications, but its performance is not optimal. In this paper, we study a non‐binary joint sparse graph which combines LDS‐OFDM and non‐binary low density parity check (LDPC) codes, namely non‐binary joint sparse graph for OFDM (NJSG–OFDM). Considering the fact that syndrome computing can be utilized to improve the convergence rate of the joint detection and decoding, syndrome nodes are added to the non‐binary joint sparse graph; consequently, an optimized receiver for the NJSG–OFDM is proposed and analyzed by extrinsic information transfer (EXIT) chart. Simulation results show that the optimized receiver has several advantages such as accelerating the convergence rate of the message passing, improving system performance and alleviating near‐far effect. Copyright © 2017 John Wiley & Sons, Ltd.
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