A multilevel soft quantize-and-forward scheme for multIPle access relay systems

Dushantha N.K. Jayakody, Jun Li, Bin Chen, Mark F. Flanagan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

This paper proposes the novel technique of multilevel threshold based soft quantization (MLT-SQ) for a multIPle access relay system (MARS). The scheme is suitable for systems using binary phase-shift keying (BPSK) and network coding at the relay. In the proposed MLT-SQ protocol, the relay evaluates the reliabilities, expressed as log-likelihood ratios (LLRs), of the received signals from the two sources. It then computes the LLRs of the network-coded packet and quantizes these using a set of optimized multilevel thresholds, forwarding the resulting 'quantized soft symbols' to the destination. We provide the derivation for the bit error rate (BER) at the destination, based on which we optimize the multilevel thresholds to minimize the BER. Compared to competing schemes, the performance of our system is superior in terms of BER when the same amount of channel state information (CSI) is exploited.

Original languageEnglish
Title of host publication2014 IEEE 25th Annual International Symposium on Personal, Indoor, and Mobile Radio Communication, PIMRC 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages464-468
Number of pages5
Volume2014-June
ISBN (Electronic)9781479949120
DOIs
Publication statusPublished - 25 Jun 2014
Externally publishedYes
Event2014 25th IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communication, IEEE PIMRC 2014 - Washington, United States
Duration: 2 Sep 20145 Sep 2014

Conference

Conference2014 25th IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communication, IEEE PIMRC 2014
CountryUnited States
CityWashington
Period2.9.145.9.14

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ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Jayakody, D. N. K., Li, J., Chen, B., & Flanagan, M. F. (2014). A multilevel soft quantize-and-forward scheme for multIPle access relay systems. In 2014 IEEE 25th Annual International Symposium on Personal, Indoor, and Mobile Radio Communication, PIMRC 2014 (Vol. 2014-June, pp. 464-468). [7136210] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/PIMRC.2014.7136210