摘要
针对传统信道模拟器仅考虑多径衰落的问题,建立了包含路径损耗、阴影衰落和多径衰落的复合衰落信道模型,提出了一种基于高斯变量分解和谐波叠加原理的硬件模拟方法,推导了该方法输出衰落幅值理论分布与仿真参数的内在联系,并详细分析了可编程逻辑器件定点化模型输出周期性及位宽选择等问题。针对原型化模拟器的实测结果表明,该模拟方法输出信道衰落的统计特性与理论值吻合,可用于实验室中无线通信系统的性能测试和验证。
The traditional channel emulator usually only consider the effects of small scale fading caused by multipath propagation.A composite fading channel model including path loss,shadowing （known as large scale fading）and mul-tipath fading is established,and a novel hardware generation method based on Gaussian decomposition and sum-of-sinusoids （SOS）theory is presented in this paper,which is suitable for hardware to realize.On this basis,the theoretical probability density function （PDF）of output fading envelope,as well as the relationship between output PDF and simulation parame-ters is derived.The periodicity of output fading sequences and data width selection for the fixed point model based on field programmable gate array （FPGA）are also analyzed.The experimental results for prototype emulator show that the output fading’s statistical properties agree well with the theoretical ones.So it can be used for performance evaluation and algo-rithm verification of wireless communication system in the lab.
出处
《信号处理》
CSCD
北大核心
2015年第1期59-65,共7页
Journal of Signal Processing
基金
航空科学基金(20120152001)
中国博士后科学基金(2013M541661)
中央高校基本科研业务费专项资金(NS2015046)
江苏高校优势学科建设工程资助项目
关键词
复合衰落
信道建模
信道模拟
谐波叠加
分解模型
composite fading
channel modeling
channel simulation
sum of sinusoids
decomposition model
