基于MCM的多径非相关无线信道改进模型研究

Improved model based on MCM for simulation of multiple uncorrelated wireless channel model

为了改善瑞利衰落信道单径自相关统计特性,提出了一种改进的多径非相关无线信道仿真模型。该模型在蒙特卡罗法(MCM)的到达角(AOA)中引入多径因素k,改进了模型AOA的取值方法。通过对信道模型参数AOA、k、低频振荡器个数N以及均方误差(MSE)的仿真分析,结果表明,该模型在相关统计特性方面与参考模型相比具有极好的吻合性;与MCM相比,在实现开销相同的情况下,改进的新模型在最大允许时间间隔内,衰落信道单径自相关函数的MSE约为MCM的四分之一,精度有了明显的提高,能更加准确地描述无线信道。新模型为无线信道仿真器的设计、频率选择性信道的建模等提供了一种新的方法。

In order to improve the statistical properties of multipath fading and more accurate description of wireless channel,this paper proposed an improved simulation model based on Monte Carlo method(MCM)for uncorrelated multiple Rayleigh fading channels.Based on the angle of arrival(AOA),it introduced the multipath element(k)into the new simulation model,which improved the method of evaluating AOA.Through the simulation analysis of the channel model parameters AOA,k,the number of low frequency oscillator and the mean square error(MSE),the results show that a pretty good agreement statistical property of the new model and those of the underlying reference model has been observed.Compared with MCM,the new model has a significant improvement in the autocorrelation properties in the same conditions and the MSEis about a quarter of the original.The new method is useful for the design of wireless channel simulator,frequency-selective channel.