受限多普勒功率谱建模方法研究

为了准确反映复杂环境下移动通信节点间的无线信道传播特性，本文研究了具有受限多普勒功率谱的信道仿真模型，讨论了三种建模方法:单路滤波法、双路滤波法、改进拼接法的原理和仿真实现方法，对比了典型模型生成信道随机过程的自相关函数、多普勒谱的算法复杂度和内存占用度。研究和仿真结果表明:在信道具有受限多普勒功率谱时，改进拼接法的自相关函数的均方根误差明显另外两种方法，同时还能避免设计数字滤波器和希尔伯特变换器，但是改进拼接法的算法复杂度远远大于其他两种模型，复杂度最小的是单路滤波法，所以在实际仿真中需要看情况取舍。论文所做比较有利于受限多普勒谱建模工作的模型选取，并为更加复杂的多普勒功率谱建模提供参考。 

Rechearch on Restricted Doppler power spectrum Modeling

In order to describe the wireless channel propagation characteristics in complicated radio environment, this paper proposes a novel channel model with restricted Doppler power spectrum. The principles and implementation methods of three modeling methods are discussed in details, including single-path filtering method, dual-path filtering method, and improved splicing method.The comparison analysis of autocorrelation function, Doppler spectrum,algorithm complexity and memory occupation of of the three typical models that generate the channel stochastic process are also presented.The results show that the root mean square error of the autocorrelation function of the improved splicing method is significantly lower than the other two methods when considering a restricted Doppler power spectrum. Meanwhile,the digital filters and Hilbert converters can be left out.The single-path filtering method leads to the lowest complexity cost. The contributions in the paper can help to select the constrained Doppler spectrum model and provide a reference for more complicated Doppler power spectrum modeling.