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One-bit soft forwarding for network coded uplink channels with multiple sources
KTH, School of Electrical Engineering (EES), Communication Theory.ORCID iD: 0000-0002-5407-0835
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2014 (English)In: 2014 IEEE International Conference on Communications, ICC 2014, IEEE Computer Society, 2014, 5790-5795 p.Conference paper (Refereed)
Abstract [en]

In this paper, we propose a threshold-based one-bit soft forwarding (TOB-SF) protocol for a multi-source relaying uplink system with network coding. In the TOB-SF protocol, the relay calculates the log-likelihood ratio (LLR) value of each network coded symbol, compares this LLR value with a pre-optimized threshold, and determines whether to transmit or keep silent. We first derive the bit error rate (BER) expression at the destination, based on which, we optimize the threshold to minimize the BER. Then we theoretically prove that the system can achieve the full diversity gain by using this threshold. Further, we optimize the power allocation at the relay to achieve a higher coding gain. Simulation results show that the proposed TOB-SF protocol outperforms other conventional relaying protocols in terms of error performance.

Place, publisher, year, edition, pages
IEEE Computer Society, 2014. 5790-5795 p.
Keyword [en]
Bit error rate, Lunar surface analysis, Conventional relaying, Error performance, Full diversity gains, Log-likelihood ratios, Multiple source, Power allocations, Uplink channel, Uplink systems
National Category
Communication Systems
URN: urn:nbn:se:kth:diva-158093DOI: 10.1109/ICC.2014.6884245ScopusID: 2-s2.0-84906996218ISBN: 978-147992003-7OAI: diva2:775093
2014 1st IEEE International Conference on Communications, ICC 2014, Sydney, NSW, Australia, 10 June 2014 through 14 June 2014

QC 20141230

Available from: 2014-12-30 Created: 2014-12-22 Last updated: 2014-12-30Bibliographically approved

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Xiao, Ming
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