LLR-based symbol selective transmission with a near-optimal threshold to minimize BEP for demodulation-forward relay systems

Taehoon Kwon, Sungmook Lim, Woohyun Seo, Daesik Hong

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Error propagation in the source-relay link limits the performance of demodulation-forward (MF) relay systems. In order to solve this problem and efficiently exploit the relay, we propose log likelihood ratio (LLR)-based symbol selective transmission with a near-optimum threshold to minimize the bit error probability (BEP). In the proposed scheme, the source information is forwarded by the relay only if it is likely to be detected correctly, as determined by a comparison of the LLR with the near-optimum threshold. To derive the near-optimum threshold, the BEP of the proposed scheme is analyzed in the case of binary phase shift keying (BPSK) signals. Simulation results confirm the accuracy of the analysis and prove that the proposed scheme efficiently mitigates error propagation.

Original languageEnglish
Article number5403532
Pages (from-to)540-545
Number of pages6
JournalIEEE Transactions on Wireless Communications
Volume9
Issue number2
DOIs
Publication statusPublished - 2010 Feb

Bibliographical note

Funding Information:
This work was supported by Korea Science and Engineering Foundation through the NRL Program (Grant R0A-2007-000-20043-0).

Funding Information:
This research was supported by the MKE (Ministry of Knowledge Economy), Korea, under the ITRC(Information Technology Research Center) support program supervised by the NIPA (National IT Industry Promotion Agency)(NIPA-2009-(C1090-0902-0005)). Digital Object Identifier 10.1109/TWC.2010.02.090248

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

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