A Trellis Coded Modulation Scheme for the Fading Relay Channel
Vijayvaradharaj T Muralidharan, B. Sundar Rajan

TL;DR
This paper introduces a Trellis Coded Modulation scheme for the fading relay channel that achieves high spectral efficiency and near-optimal performance at high SNR, with design criteria for maximizing diversity and coding gains.
Contribution
It proposes a novel TCM scheme with a near-ML decoder for the relay channel, providing design criteria and demonstrating significant SNR gains through simulations.
Findings
Large SNR gain over uncoded and direct transmission schemes
Performance of the near-ML decoder approaches optimal ML at high SNR
Labelling scheme significantly impacts BER performance
Abstract
A decode and forward protocol based Trellis Coded Modulation (TCM) scheme for the half-duplex relay channel, in a Rayleigh fading environment, is presented. The proposed scheme can achieve any spectral efficiency greater than or equal to one bit per channel use (bpcu). A near-ML decoder for the suggested TCM scheme is proposed. It is shown that the high SNR performance of this near-ML decoder approaches the performance of the optimal ML decoder. The high SNR performance of this near-ML decoder is independent of the strength of the Source-Relay link and approaches the performance of the optimal ML decoder with an ideal Source-Relay link. Based on the derived Pair-wise Error Probability (PEP) bounds, design criteria to maximize the diversity and coding gains are obtained. Simulation results show a large gain in SNR for the proposed TCM scheme over uncoded communication as well as the…
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Taxonomy
TopicsCooperative Communication and Network Coding · Advanced Wireless Communication Technologies · Full-Duplex Wireless Communications
