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Performance analysis of adaptive physical layer network coding for wireless two-way relaying

Muralidharan, Vijayvaradharaj T and Rajan, Sundar B (2013) Performance analysis of adaptive physical layer network coding for wireless two-way relaying. In: IEEE Transactions on Wireless Communications, 12 (3). pp. 1328-1339.

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Official URL: http://dx.doi.org/10.1109/TWC.2012.12.120923


The performance analysis of adaptive physical layer network-coded two-way relaying scenario is presented which employs two phases: Multiple access (MA) phase and Broadcast (BC) phase. The deep channel fade conditions which occur at the relay referred as the singular fade states fall in the following two classes: (i) removable and (ii) non-removable singular fade states. With every singular fade state, we associate an error probability that the relay transmits a wrong network-coded symbol during the BC phase. It is shown that adaptive network coding provides a coding gain over fixed network coding, by making the error probabilities associated with the removable singular fade states contributing to the average Symbol Error Rate (SER) fall as SNR-2 instead of SNR-1. A high SNR upper-bound on the average end-to-end SER for the adaptive network coding scheme is derived, for a Rician fading scenario, which is found to be tight through simulations. Specifically, it is shown that for the adaptive network coding scheme, the probability that the relay node transmits a wrong network-coded symbol is upper-bounded by twice the average SER of a point-to-point fading channel, at high SNR. Also, it is shown that in a Rician fading scenario, it suffices to remove the effect of only those singular fade states which contribute dominantly to the average SER.

Item Type: Journal Article
Publication: IEEE Transactions on Wireless Communications
Publisher: IEEE-Inst Electrical Electronics Engineers Inc
Additional Information: Copyright of this article belongs to IEEE-Inst Electrical Electronics Engineers Inc.
Keywords: Denoise-and-Forward; Physical Layer Network Coding; Wireless Two-Way Relaying
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 29 May 2013 10:25
Last Modified: 29 May 2013 10:25
URI: http://eprints.iisc.ac.in/id/eprint/46609

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