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Design of quasi-orthogonal space-time block codes for cooperative wireless relay networks over frequency selective fading channels

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2 Author(s)
Quoc-Tuan Vien, Q.-T. ; Sch. of Electron. & Inf., Kyung Hee Univ., Yongin, South Korea ; Hong, Een-Kee

This paper proposes a distributed quasi-orthogonal space-time block code (DQOSTBC) over frequency selective fading channels for amplify-and-forward cooperative wireless relay networks. The proposed DQOSTBC is designed to achieve maximal data rate, spatial diversity gain and full decoupling for a relay network with four active relays. These goals are obtained by precoding the received signals at each relay to form the quasi-orthogonal space-time block codes (QOSTBCs) as developed for multiple-input multiple-output systems. To avoid the intersymbol interference caused by the dispersive nature of frequency selective fading, the frequency domain equalizer is exploited in our design for low-complexity receiver. In addition, the simulation results prove that our design provides 4 dB improvement in terms of bit error rate as a benefit of applying the QOSTBC to cooperative networks.

Published in:

Advanced Technologies for Communications, 2009. ATC '09. International Conference on

Date of Conference:

12-14 Oct. 2009

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