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提出一种基于空时分组编码的异步正交频分复用(OFDM,Orthogonal Frequency Division Multiplexing)协同分集方案。提出的方案在中继节点实现OFDM调制及OFDM符号的时间反转和复共轭,信宿节点接收信号的每个OFDM子载波都具有Alamouti空时分组编码结构。信宿节点采用最大似然(ML,Maximum Likelihood)译码准则译码。仿真结果表明,提出的异步OFDM空时协同分集方案无需两个中继节点的同步可获得二阶分集增益,且与其它协同分集方案相比,该方案的误比特率和实现复杂度都更低。
This paper proposes an Orthogonal Frequency Division Multiplexing (OFDM) cooperative diversity scheme based on space-time block coding. The proposed scheme realizes OFDM modulation and time-reversal and complex conjugation of OFDM symbols at the relay node, and each OFDM sub-carrier of the signal receiver node receives Alamouti space-time block coding structure. The sink node decodes with Maximum Likelihood (ML) coding criterion. The simulation results show that the proposed asynchronous OFDM space-time cooperative diversity scheme can obtain the second-order diversity gain without the synchronization of two relay nodes, and the bit error rate and implementation complexity of the scheme are lower than other cooperative diversity schemes .