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a rotated quasi-orthogonal space-time block code for asynchronous cooperative diversity一个旋转quasi-orthogonal时空分组码为异步合作的多样性
Entropy 2012, 14, 654-664; doi:10.3390/
OPEN ACCESS
entropy
ISSN 1099-4300
/journal/entropy
Article
A Rotated Quasi-Orthogonal Space-Time Block Code for
Asynchronous Cooperative Diversity
Liang-Fang Ni *, Fu-Kui Yao and Li Zhang
School of Electrical Engineering and Information, Anhui University of Technology, Ma’anshan,
243002, China; E-Mails: yaofuk@163.com (F.-K.Y.); linyizhangli216@163.com (L.Z.)
* Author to whom correspondence should be addressed; E-Mail: nilf@;
Tel.: +86-0555-236-8431; Fax: +86-0555-231-6596.
Received: 16 February 2012; in revised form: 4 March 2012 / Accepted: 22 March 2012 /
Published: 29 March 2012
Abstract: The rotated quasi-orthogonal space-time block code (RQSTBC) for asynchronous
cooperative diversity is proposed in this paper. The source selects half of the symbols from
a signal constellation set and the other half of them from that constellation rotated with the
optimum angle. Meanwhile, it constructs orthogonal frequency division multiplexing
(OFDM) frames to counterbalance time delays of the signals. Then, relays create the
frequency domain quasi-orthogonal space-time block transmitted signals matrix in such a
way that its items are staggered to take on the Jafarkhani code structure or time-reversion
of it. These three stages let the received signals at the destination take on RQSTBC
structure with diversity order 4, which results in the fast symbol-pair-wise maximum
likelihood
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