1st International ICST Conference on Communications and Networking in China

Research Article

A New Quasi-orthogonal Space-time Block Code

  • @INPROCEEDINGS{10.1109/CHINACOM.2006.344883,
        author={Xiao Liping and Xu  Chengqian and Zhang  Weifeng},
        title={A New Quasi-orthogonal Space-time Block Code},
        proceedings={1st International ICST Conference on Communications and Networking in China},
        publisher={IEEE},
        proceedings_a={CHINACOM},
        year={2007},
        month={4},
        keywords={Low-complexity maximum-likelyhood (LC-ML) Orthogonal space-time block code Quasi-orthogonal space-time block code Wireless communication},
        doi={10.1109/CHINACOM.2006.344883}
    }
    
  • Xiao Liping
    Xu Chengqian
    Zhang Weifeng
    Year: 2007
    A New Quasi-orthogonal Space-time Block Code
    CHINACOM
    IEEE
    DOI: 10.1109/CHINACOM.2006.344883
Xiao Liping1,2,*, Xu Chengqian1,2, Zhang Weifeng1,2
  • 1: College of Information Science and Engineering,
  • 2: YanShan University, Qinhuangdao, Hebei, 066004, China.
*Contact email: lpxiao@ysu.edu.cn

Abstract

A full rate space-time block code (STBC) for four transmit antennas based on quasi-orthogonal design is proposed in this paper. The 4times4 transmission matrix of the presented quasi-orthogonal space-time block code (QOSTBC) is constructed based on Alamouti's scheme. The original maximum-likelihood (ML) decoding scheme and the low-complexity ML (LC-ML) decoding scheme for the new code are introduced. Then the decoding speed of them is compared. The simulation results show: the performance of the new code is better than that of orthogonal space-time block codes (OSTBC) at low SNR; it also exceeds the bit error rate (BER) of OSTBC at high SNR if the new code uses constellation rotation; the LC-ML decoding scheme is faster than the original ML decoding scheme.