Low-complexity distributed differential spacetime coding scheme for amplify-and-forward cooperative networks

• Published in: Science China. Information sciences Vol. 52; no. 8; pp. 1418 - 1427
• Main Authors: Yu, XiangBin, Bi, GuangGuo, Xu, WeiYe
• Format: Journal Article
• Language: English
• Published: Heidelberg SP Science in China Press 01.08.2009; Springer Nature B.V
• Subjects: Amplification; Coding; Complexity; Computer Science; Decoding; Error analysis; Information Systems and Communication Service; Orthogonality; Systems design; Transmitters; Wireless networks; 信息知识; 信道估计; 功率分配; 成对错误概率; 无线网络; 空时编码; 自动对焦; 译码复杂度; differential space-time coding; amplify-and-forward method; power allocation; cooperative communication
• ISSN: 1009-2757; 1674-733X; 1862-2836; 1869-1919
• DOI: 10.1007/s11432-009-0117-6

By introducing a space-time coding scheme based on amicable orthogonality, we develop a distributed differential space-time coding scheme with the amplify-and-forward （AF） method for wireless cooperative networks. The scheme requires no knowledge of the channel state information at both transmitters and receivers, and effectively decreases the realization complexity due to no channel estimation. Moreover, it has lower decoding complexity and higher coding advantage than the existing scheme, thus avoiding the shortcoming of exponential decoding complexity of some existing schemes. According to the pairwise error probability （PEP） analysis of the system, the power allocations of source and relay terminals are jointly optimized, and as a result, the PEP is minimized, which will provide a helpful guideline for system design. Numerical calculation and simulation results show that the developed scheme is superior to the existing scheme. Moreover, the scheme with optimal power allocation yields obvious performance improvement over that with equal power allocation.