同频同调制信号的瑞利信道系统仿真设计

Simulation design of Rayleigh channel system for signals with same carrier frequency and modulation

为了解决通信系统仿真模型的不完备性,利用Matlab的组件Simulink搭建了一套模拟信号的传输、接收、分离的接收机通信仿真模型。该模型以同频同调制信号为信源,选取多径瑞利衰落信道模拟仿真实际接收机的工作流程,并且包括信源模块、调制解调模块、信道模块、模拟接收模块、采样滤波模块、信号分离模块等。此外,系统测试了瑞利信道的路径增益对信号盲分离的影响,仿真结果表明信道增益越大,信号越集中,分离效果也相对较好。因此,该仿真系统可以与硬件系统原型相结合,为测试信号提供功能验证,为实际接收机系统运行环境提供参考建议。

To eliminate the incompleteness of the communication simulation model,the Simulink of Matlab software is used to establish a receiver communication simulation model for signal transmission,receiving and separation. Taking the signals with same carrier frequency and modulation as the signal source of the model,the multipath Rayleigh fading channel is selected to simulate the actual working process of the receiver. The model includes signal source module,modem module,channel module,simulation receiving module,sampling filtering module and signal separation module. The influence of Rayleigh channel′ s path gain on signal blind separation was tested in the system. The simulation results show that the separation effect is relatively better with the increase of the channel gain and concentration of the signal. Therefore,the combination of the simulation system and hardware system prototype can provide the functional verification for testing signals and a reference for the operating environment of the actual receiver system.