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针对两跳多中继协作传输系统,提出了一种新的高效频谱增量中继协议。该协议通过在目的节点设定接收门限值,判断是否需要中继转发信息。信号传输分两个阶段:第一个阶段,源节点广播信息,当直接传输链路的信噪比高于给定门限时,则传送成功;否则,多个中继节点采用分布式波束成形的方式将信源信号转发给目的节点。进一步,通过理论分析,给出了求解最优门限的解析表达式,通过仿真给出数值解。仿真结果表明,当采用最优门限时,所提出协议的频谱效率在任意信噪比下都优于直接传输和固定中继传输协议。
Aiming at the two-hop multi-relay coordinated transmission system, a new efficient spectrum incremental relay protocol is proposed. The protocol sets the receiving threshold at the destination node to determine whether relay forwarding information is required. The signal transmission is divided into two phases. In the first phase, the source node broadcasts the information, and when the signal-to-noise ratio of the direct transmission link is higher than a given threshold, the transmission is successful. Otherwise, multiple relay nodes adopt distributed beamforming The source signal is forwarded to the destination node. Further, through theoretical analysis, an analytical expression for solving the optimal threshold is given, and the numerical solution is given through simulation. The simulation results show that when the optimal threshold is adopted, the spectral efficiency of the proposed protocol is better than the direct transmission and fixed relay transmission protocols under any SNR.