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采用差分调制的传输方式,差分协同通信虽可有效避免相干协同通信中进行实时信道估计比较困难的难题,具有较高的系统可实现性,但与相干传输相比存在一定的接收性能损失。文中将用于单天线DPSK系统的维特比译码接收算法推广应用于差分协同通信中,构建了基于译码前传协同策略的三节点差分协同通信系统模型,并利用MATLAB软件对该系统采用维特比译码接收的性能进行了仿真分析。结果表明,差分调制信号采用维特比译码接收可获得逼近相干系统的抗误码性能,这对差分协同信号同样有效。
Adopting differential modulation transmission method, differential cooperative communication can effectively avoid the difficult problem of real-time channel estimation in coherent cooperative communication and has high system realizability. However, there is a certain reception performance loss compared with coherent transmission. In this paper, the Viterbi decoding and receiving algorithm for single-antenna DPSK system is extended to differential cooperative communication, and a three-node differential cooperative communication system model based on the decoding and pre-transmission collaborative strategy is constructed. The system uses Viterbi The performance of decoding and receiving is analyzed by simulation. The results show that the differential modulation signal received by Viterbi decoding can obtain the error resilience performance of the approximation coherent system, which is also valid for the differential cooperative signal.