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A Simple Distributed Space-Time Coded Strategy for Two-Way Relay Channels

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3 Author(s)
Alabed, S.J. ; Commun. Syst. Group, Darmstadt Univ. of Technol., Darmstadt, Germany ; Paredes, J.M. ; Gershman, A.B.

For two-way wireless relay networks (TWRNs), the simultaneous bidirectional transmission has been shown to outperform other strategies using decode-and-forward (DF) distributed space-time coding (DSTC), thanks to its high spectral efficiency. However, it has a rather high relay decoding complexity and cannot use the direct link between the communicating terminals. In this letter, we propose a simple DSTC transmission scheme for TWRNs that avoids the latter disadvantages at the same symbol rate and with a performance advantage at high powers. Our strategy allows the communicating terminals to use the direct link between them to achieve a higher diversity gain. An extension of the proposed strategy to the differential case is also discussed.

Published in:

Wireless Communications, IEEE Transactions on  (Volume:11 ,  Issue: 4 )