A Low-Complexity Alamouti Space-Time Transmission Scheme for Asynchronous Cooperative Systems 


Vol. 35,  No. 5, pp. 479-486, May  2010


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  Abstract

In this paper, we propose a novel low-complexity Alamouti coded orthogonal frequency division multiplexing (OFDM) scheme for asynchronous cooperative communications. Exploiting the combination of OFDM symbols at the source node and simple operations including sign change and complex product at the relay node, the proposed scheme can achieve cooperative diversity gain without use of time-reversion and shifting operations that the conventional scheme proposed by Li and Xia needs. In addition, by using the cyclic prefix (CP) removal and insertion operations at the relay node, the proposed scheme does not suffer from a considerable degradation of bit-error-rate (BER) performance even though perfect timing synchronization is not achieved at the relay node. From the simulation results, it is demonstrated that the BER performance of the proposed scheme is much superior to that of the conventional scheme in the presence of timing synchronization error at the relay node. It is also shown that the proposed scheme obtains two times higher diversity gain compared with the conventional scheme at the cost of half reduction in transmission efficiency.

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  Cite this article

[IEEE Style]

Y. Lee, D. Chong, Y. Lee, C. Song, S. Yoon, "A Low-Complexity Alamouti Space-Time Transmission Scheme for Asynchronous Cooperative Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 35, no. 5, pp. 479-486, 2010. DOI: .

[ACM Style]

Youngpo Lee, Dahae Chong, Youngyoon Lee, Chonghan Song, and Seokho Yoon. 2010. A Low-Complexity Alamouti Space-Time Transmission Scheme for Asynchronous Cooperative Systems. The Journal of Korean Institute of Communications and Information Sciences, 35, 5, (2010), 479-486. DOI: .

[KICS Style]

Youngpo Lee, Dahae Chong, Youngyoon Lee, Chonghan Song, Seokho Yoon, "A Low-Complexity Alamouti Space-Time Transmission Scheme for Asynchronous Cooperative Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 35, no. 5, pp. 479-486, 5. 2010.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880