Rate Compatible Modulation for Correlated Information Sources
作者： Javier Garcia-Frias , Pedro M. Crespo , Mariano E. Burich , Imanol Granada
DOI: 10.1109/ACCESS.2021.3073972
关键词:
摘要: In this paper we consider the problem of transmitting spatially Correlated Information Sources (CIS) over Additive White Gaussian Noise (AWGN) Multiple Access Channel (MAC) with transmitted energy constraint. It is well known that system performance optimized if codewords are designed to take advantage correlation among sources in multiple access channel. To end, make use Rate Compatible Modulation (RCM) codes, whose sparse nature advantageous preserve source MAC. order exploit correlation, proposed RCM-CIS comprised a set RCM codes share same random structure but each code having its own weight values jointly designed. At receiver, non-binary decoding applied avoid short length cycles arise factor graph, which obtained by considering and codes. Simulation results show for high throughput transmission rate has good terms BER vs SNR, attaining below Shannon limit source-channel separation assumed. As shown numerical results, inherits error floors encountered point-to-point lower floor, propose Low Density Generation Matrix (LDGM) parallel structure. The LDGM transmits small fraction total coded sequence, it capable correcting residual errors produced system.
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