Wireless Network-Coded Accumulate-Compute-and-Forward Two-Way Relaying

Shukla, Srishti and Muralidharan, Vijayvaradharaj Tirucherai and Rajan, Sundar B (2016) Wireless Network-Coded Accumulate-Compute-and-Forward Two-Way Relaying. In: IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, 65 (3). pp. 1367-1381.

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Abstract

For the physical-layer network-coded wireless two-way relaying, it was observed by Koike-Akino et al. that adaptively changing the network coding map used at the relay according to channel conditions greatly reduces the impact of multiple-access interference, which occurs at the relay, and all these network coding maps should satisfy a requirement called exclusive law. We extend this approach to an accumulate-compute-and-forward protocol, which employs two phases: a multiple access (MA) phase consisting of two channel uses with independent messages in each channel use and a broadcast (BC) phase having one channel use. Assuming that the two users transmit points from the same 4-phase-shift keying (PSK) constellation, every such network coding map that satisfies the exclusive law can be represented by a Latin square of side 16, and conversely, this relationship can be used to get the network coding maps satisfying the exclusive law. Two methods of obtaining this network coding map to be used at the relay are discussed. Using the structural properties of the Latin squares for a given set of parameters, the problem of finding all the required maps is reduced to finding a small set of maps for the case. Having obtained all the Latin squares, a criterion is provided to select a Latin square for a given realization of fade state. This criterion turns out to be the same as the one used byMuralidharan et al. for two-stage bidirectional relaying.

Item Type:	Journal Article
Publication:	IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
Publisher:	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Additional Information:	Copy right for this article belongs to the IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
Keywords:	Latin squares; two-way relaying; wireless network coding
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	28 Apr 2016 05:43
Last Modified:	28 Apr 2016 05:43
URI:	http://eprints.iisc.ac.in/id/eprint/53731

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