Turbo joint source-channel coding of non-uniform memoryless sources in the bandwidth-limited regime

Abstract

In this letter we investigate the one-layer coding/shaping system with single-level codes and sigmamapping for the bandwidth-limited regime. Specifically, we consider non-uniform memoryless sources sent over AWGN channels. At the transmitter, binary data are encoded by a Turbo code composed by two identical RSC (Recursive Systematic Convolutional) encoders. The encoded bits are randomly interleaved and modulated before entering the sigma-mapper. The modulation employed in this system follows the unequal energy allocation scheme first introduced in [?]. At each time instant, the sigma-mapper superimposes multiple modulated symbols so as to output an amplitude signal. The receiver consists of an iterative demapping/decoding algorithm, which incorporates the a priori probabilities of the source symbols. Simulation results show that a significant improvement is obtained when the unequal energy allocation scheme is used rather than a standard BPSK modulation. Furthermore, the proposed scheme is compared with that proposed in [?] for the power-limited regime and unequal energy allocation.

DOI: 10.1109/LCOMM.2010.04.092462

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Cite this paper

@article{Ochoa2010TurboJS, title={Turbo joint source-channel coding of non-uniform memoryless sources in the bandwidth-limited regime}, author={Idoia Ochoa and Pedro M. Crespo and Javier Del Ser and Mikel Hernaez}, journal={IEEE Communications Letters}, year={2010}, volume={14}, pages={336-338} }