A Semi-Orthogonal Distributed Alamouti Space-Time Codes Design

  • Authors:
  • Xiao-Ya Li;Wei Liu;Jian-Dong Li;Peng-Yu Huang

  • Affiliations:
  • State Key Laboratory of Integrated Service Networks, Xidian University, Xi'an, China 710071;State Key Laboratory of Integrated Service Networks, Xidian University, Xi'an, China 710071;State Key Laboratory of Integrated Service Networks, Xidian University, Xi'an, China 710071;State Key Laboratory of Integrated Service Networks, Xidian University, Xi'an, China 710071

  • Venue:
  • Wireless Personal Communications: An International Journal
  • Year:
  • 2013

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Abstract

In this paper, a novel semi-orthogonal distributed Alamouti space-time codes transmission protocol is proposed for a four nodes cooperative communication system consisting of one source, one destination and two semi blind relays over block fading channels. In particular, by semi-orthogonal we mean two orthogonal frequency bands are invoked, one of which is for the transmission by the source node, while the other one is shared simultaneously by the two relay-destination links. Moreover, analytical performances of the proposed semi-orthogonal scheme are investigated in this paper. Specifically, the theoretical expressions of the exact SER and diversity order are presented. Our proposed scheme is capable of achieving higher spectral efficiency and remaining the same diversity order compared to the existing orthogonal one, while attaining better symbol error rate performance and higher diversity order against the non-orthogonal design. Finally, simulation results prove the correctness of the above conclusions and also verify our derivation for the analytical performances.