Distributed space-time block coding

TitleDistributed space-time block coding
Publication TypeConference Paper
Year of Publication2005
AuthorsYiu, S., R. Schober, and L. Lampe
Conference NameGlobal Telecommunications Conference, 2005. GLOBECOM '05. IEEE
Pagination6 pp.
Date Publishednov.
Keywordsad hoc networks, antennas, block codes, decode-and-forward relaying, distributed space-time block coding, diversity order, diversity reception, information-carrying code matrix, matrix algebra, performance loss, sensor networks, signal transmission, signature vector, space-time codes, wireless networks

In this paper, a new class of distributed space-time block codes (DSTBCs) is introduced. These DSTBCs are designed for wireless networks which have a large set of nodes N but at any given time only a small, a priori unknown subset of nodes S sub; N can be active. In the proposed scheme, the signal transmitted by an active node is the product of an information-carrying code matrix and a unique node signature vector. It is shown that existing STBCs designed for Nc ge; 2 co-located antennas are favorable choices for the code matrix guaranteeing a diversity order of d = min{NS, Nc} if nS nodes are active. For the most interesting case NS ge; Nc the performance loss entailed by the distributed implementation is analytically characterized. Furthermore, efficient methods for the optimization of the set of signature vectors are provided. Possible applications of the proposed DSTBCs include ad hoc and sensor networks employing decode-and-forward relaying.


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