Abstract
This paper is concerned with the design of decoding algorithms for superposition modulation systems in which all levels are coded with an identical binary low-density parity-check (LDPC) code. First, we present a computing-based iterative multistage decoding algorithm (CB-IMSDA). Then, we show that the considered system can be treated as a nonbinary LDPC (NB-LDPC) coded modulation system. Based on this, a joint decoding algorithm (JDA) is proposed. As a by-product, we propose a time-varying signaling scheme for the JDA. Numerical results show that 1) both the CB-IMSDA and JDA perform better than the standard iterative multistage decoding algorithm, and 2) extra coding gain can be obtained when the time-varying signaling scheme is employed.
Published Version
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