Compress-and-Forward via Multilevel Coding and Trellis Coded Quantization
Abstract
Compress-forward (CF) relays can improve communication rates even when the relay cannot decode the source signal. Efficient implementation of CF is a topic of contemporary interest, in part because of its potential impact on wireless technologies such as cloud-RAN. There exists a gap between the performance of CF implementations in the high spectral efficiency regime and the corresponding information theoretic achievable rates. We begin by re-framing a dilemma causing this gap, and propose an approach for its mitigation. We utilize trellis coded quantization (TCQ) at the relay together with multi-level coding at the source and relay, in a manner that facilitates the calculation of bit LLRs at the destination for joint decoding. The contributions of this work include designing TCQ for end-to-end relay performance, since a distortion-minimizing TCQ is suboptimum. The reported improvements include a 1dB gain over prior results for PSK modulation.
Cite
@article{arxiv.2301.03128,
title = {Compress-and-Forward via Multilevel Coding and Trellis Coded Quantization},
author = {Heping Wan and Anders Host-Madsen and Aria Nosratinia},
journal= {arXiv preprint arXiv:2301.03128},
year = {2023}
}