DocumentCode
1127644
Title
Delay-Tolerant Distributed-TAST Codes for Cooperative Diversity
Author
Damen, Mohamed Oussama ; Hammons, A. Roger, Jr.
Author_Institution
Waterloo Univ., Waterloo
Volume
53
Issue
10
fYear
2007
Firstpage
3755
Lastpage
3773
Abstract
In cooperative networks using a decode-and-forward strategy, the multiple relays effectively transmit a distributed space-time code, the performance of which can be severely degraded when timing synchronization among the relays is not assured (e.g., in cases of broadcast to dispersed recipients or in networks without a shared, high-quality timing reference). Recent work by Xia and Hammons have investigated the design of distributed space-time codes that are delay tolerant, in the sense that full spatial diversity is achieved regardless of timing offsets. In general, the previously known space-time block codes belonging to the class of C-linear codes, however, which are important because they achieve full spatial diversity and admit near-optimal lattice decoding algorithms, are not delay tolerant. In this paper, we present a new family of such codes that are fully delay tolerant. The new codes generalize the threaded algebraic space-time (TAST) codes introduced by El Gamal and Damen. Like their brethren, the new distributed-TAST codes are effective and flexible, enabling use of different signaling constellations, transmission rates, numbers of transmit and receive antennas, and decoders of varying levels of complexity.
Keywords
algebraic codes; block codes; decoding; delays; diversity reception; linear codes; radio networks; space-time codes; synchronisation; c-linear codes; cooperative diversity; cooperative networks; decode-and-forward strategy; delay-tolerant distributed-TAST codes; distributed space-time code; multiple relays; near-optimal lattice decoding algorithms; spatial diversity; threaded algebraic space-time codes; timing synchronization; wireless communication; Block codes; Broadcasting; Decoding; Degradation; Delay; Dispersion; Lattices; Relays; Space time codes; Timing; Distributed; cooperation; cooperative networks; decode-and-forward; multiple-input multiple-output (MIMO); space–time codes; threaded algebraic space–time (TAST);
fLanguage
English
Journal_Title
Information Theory, IEEE Transactions on
Publisher
ieee
ISSN
0018-9448
Type
jour
DOI
10.1109/TIT.2007.904773
Filename
4305392
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