A Non-differential Distributed Space-Time Coding for Partially-Coherent Cooperative Communication

In a distributed space-time coding scheme, based on the relay channel model, the relay nodes co-operate to linearly process the transmitted signal from the source and forward them to the destination such that the signal at the destination appears as a space time block code. Recently, a code design c...

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Vydáno v:	IEEE transactions on wireless communications Ročník 7; číslo 11; s. 4076 - 4081
Hlavní autoři:	Harshan, J., Rajan, B.S.
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Piscataway, NJ IEEE 01.11.2008 Institute of Electrical and Electronics Engineers The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:	Applied sciences Block codes Broadcasting Codes Coding Coding, codes Cooperative communication cyclic groups Decoding Detection, estimation, filtering, equalization, prediction Digital relays distributed space-time codes and unitary space-time codes Exact sciences and technology Generators Information, signal and communications theory Mathematical analysis Matrices Pairwise error probability Protocols Relay Robustness Signal and communications theory Signal processing Signal, noise Space time codes Sufficient conditions Systems, networks and services of telecommunications Telecommunications Telecommunications and information theory Transmission and modulation (techniques and equipments) Performance evaluation Block code cyclic groups Space-time codes Parameter estimation Unitary matrix Relay Error probability Abelian group Cooperative communication Necessary and sufficient condition Failures Maximum likelihood decoding Relay channel Coding Channel estimation Algorithm complexity distributed space-time codes and unitary space-time codes Differential technique
ISSN:	1536-1276, 1558-2248
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Popis
Shrnutí:	In a distributed space-time coding scheme, based on the relay channel model, the relay nodes co-operate to linearly process the transmitted signal from the source and forward them to the destination such that the signal at the destination appears as a space time block code. Recently, a code design criteria for achieving full diversity in a partially-coherent environment have been proposed along with codes based on differential encoding and decoding techniques. For such a set up, in this paper, a nondifferential encoding technique and construction of distributed space time block codes from unitary matrix groups at the source and a set of diagonal unitary matrices for the relays are proposed. It is shown that, the performance of our scheme is independent of the choice of unitary matrices at the relays. When the group is cyclic, a necessary and sufficient condition on the generator of the cyclic group to achieve full diversity and to minimize the pairwise error probability is proved. Various choices on the generator of cyclic group to reduce the ML decoding complexity at the destination is presented. It is also shown that, at the source, if non-cyclic abelian unitary matrix groups are used, then full-diversity can not be obtained. The presented scheme is also robust to failure of any subset of relay nodes.
Bibliografie:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 content type line 23
ISSN:	1536-1276 1558-2248
DOI:	10.1109/T-WC.2008.070526