基于Alamouti码的OFDM协作系统中继选择算法

Relay Selection Algorithm for Alamouti Coding Based OFDM Cooperative Communication Systems

针对在Alamouti放大/解码转发且有/无直接链路的协作系统进行研究,提出一种基于判决量的最佳中继节点选择算法。算法中,判决量是中继节点根据自身链路的信道信息计算出接收信号所有子载波上的信噪比之和,结合当前信噪比选择判决量最大的候选节点为本次传输的中继节点。通过数学建模、理论分析和仿真等,证明所提出基于判决量的中继选择算法可适用在中继协作通信系统中。

In this paper,an OFDM cooperative communication system using the Alamouti space-time coding with multiple relay nodes has been considered.We studied the relay selection scheme in this system and proposed a selection algorithm based on a new criterion.The algorithm sums up the signal-to-noise ratios(SNRs)of all subcarriers of all relays and selects the relay with highest sum SNR for transmission.The performances of the proposed algorithm have been verified by mathematical modeling,theoretical analysis and computer simulations.The results show that the proposed algorithm is fit for OFDM cooperative communication system using the Alamouti space-time coding in practice.