Quantifying the loss of compress-forward relaying without Wyner-Ziv coding

Authors:
Tùng T. Kim;Mikael Skoglund;Giuseppe Caire
Affiliations:
Department of Electrical Engineering, Princeton University, Princeton, NJ and School of Electrical Engineering, Royal Institute of Technology, Stockholm, Sweden;School of Electrical Engineering and ACCESS Linnaeus Center, Royal Institute of Technology, Stockholm, Sweden;Department of Electrical Engineering, University of Southern California, Los Angeles, CA
Venue:
IEEE Transactions on Information Theory
Year:
2009

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Abstract

The compress-and-forward (CF) strategy achieves the optimal diversity-multiplexing tradeoff (DMT) of a three-node half-duplex relay network in slow fading, under the assumption that the relay has perfect knowledge of all three channel coefficients and that the relay makes use of Wyner-Ziv (WZ) source coding with side information. This paper studies the achievable DMT of the same network when the relay is constrained to make use of standard (non-WZ) source coding. Under a short-term power constraint at the relay, using source coding without side information results in a significant loss in terms of the DMT. For multiplexing gains r ≤ 2/3, this loss can be fully compensated for by using power control at the relay. On the contrary, for r ∈ (2/3,1), the loss with respect to WZ coding remains significant.