Low-density lattice coded relaying with joint iterative decoding
| Autor: | Dushantha Nalin K. Jayakody, Bin Chen, Mark F. Flanagan |
|---|---|
| Přispěvatelé: | Electro-Optical Communication, Information and Communication Theory Lab, Signal Processing Systems |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
050801 communication & media studies
02 engineering and technology Data_CODINGANDINFORMATIONTHEORY law.invention 0508 media and communications Relay law coded cooperation 0202 electrical engineering electronic engineering information engineering Electronic engineering Computer Science::Networking and Internet Architecture Fading Electrical and Electronic Engineering Mathematics Computer Science::Information Theory 05 social sciences ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS 020206 networking & telecommunications Code rate Coding gain joint iterative decoding Diversity gain Linear network coding Low-density lattice codes (LDLCs) Algorithm Relay channel Decoding methods |
| Zdroj: | IEEE Transactions on Communications, 63(12), 4824-4837. Institute of Electrical and Electronics Engineers |
| ISSN: | 0090-6778 |
| DOI: | 10.1109/tcomm.2015.2493551 |
| Popis: | Low-density lattice codes (LDLCs) are known for their high decoding efficiency and near-capacity performance on point-to-point Gaussian channels. In this paper, we present a distributed LDLC-based cooperative relaying scheme for the multiple-access relay channel (MARC). The relay node decodes LDLC-coded packets from two sources and forwards a network-coded combination to the destination. At the destination, a joint iterative decoding structure is designed to exploit the diversity gain as well as coding gain. For the LDLC-based network coding operation at the relay, we consider two alternative methods which offer a tradeoff between implementation complexity and performance, called superposition LDLC (S-LDLC) and modulo-addition LDLC (MA-LDLC). Soft symbol relaying is considered as an alternative to hard decision relaying which is capable of reducing the effect of error propagation at the relay. Simulation results show that the proposed scheme can provide greater diversity gain and up to 6.2 dB coding gain when compared with noncooperative LDLC coding and uncoded network-coded transmission. The proposed scheme also achieves 2.5 dB gain over network-turbo-coded cooperation, for the same code rate and overall transmitted power. Also, soft symbol relaying is shown to provide approximately 2 dB gain over hard decision relaying when the source-relay link suffers from deep fading. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|