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Partially-Coherent Distributed Space-Time Codes with Differential Encoder and Decoder

T, Kiran and Rajan, Sundar B (2007) Partially-Coherent Distributed Space-Time Codes with Differential Encoder and Decoder. In: IEEE Journal on Selected Areas in Communication, 25 (2). pp. 426-433.

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Distributed space-time coding is a mean of achieving diversity through cooperative communication in a wireless relay network. In this paper, we consider a transmission protocol that follows a two-stage model: transmission from source to relays in the first stage, followed by a simple relaying technique from relays to destination. The relays transmit a vector which is a transformation of the received vector by a relay-specific unitary transformation. We assume that the relays do not have any channel information, while the destination has only a partialchannel knowledge, by which we mean that destination knows only the relay-to-destination channel. For such a setup, we derive a Chernoff bound on the pairwise error probability and propose code design criteria. A second contribution is the differential encoding and decoding scheme for this setup, which is different from the existing ones. Furthermore, differential codes from cyclic division algebra are proposed that achieve full diversity. For our setup with two relays, a Generalized PSK code is shown to achieve full diversity, for which the decoding complexity is independent of code size.

Item Type: Journal Article
Publication: IEEE Journal on Selected Areas in Communication
Additional Information: Copyright 2007 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords: Cyclic division algebra;Differential decoder;Differential encoder;Distributed space-time code;diversity;pairwise error probability.
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 29 Jul 2008
Last Modified: 19 Sep 2010 04:48
URI: http://eprints.iisc.ac.in/id/eprint/15297

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