基于FPGA的移动通信衰落信道的建模与实现

Modeling and Implementing for Mobile Radio Fading Channel in IF Based on FPGA

介绍了一种基于现场可编程逻辑阵列器件 (FPGA)的中频移动通信衰落信道模拟系统设计方案 ,它可以模拟在地面环境下的移动通信传播特性 .该系统可以在实验室条件下评估移动通信终端的性能 .利用FPGA作为数字信号处理平台来实现可调的衰落带宽以及多径延时 .介绍了一个模拟最多三个不同传播路径的典型多径效应模型 ,通过增加相同的单元数目可以实现更多路径的模拟 .该通道衰落模拟系统专为速度达到 1 2 0km/h以及多径时延达到

A device based in Field Programmable Logic Array(FPGA)to simulate the channel propagation characteristics of the ground mobile environment at Inter Frequency (IF) has been designed and implemented.This device allows the performance of a mobile radio unit to be evaluated in laboratory under controlled conditions. The adjustable fading bandwidths and additional long delays were implemented by using the relative new signal processing technologies of FPGA device. A typical model to simulate the multi path effects up to three different propagation paths was introduced , more paths' simulation can be implemented by increasing the number of same units. The channel simulator was designed to simulate mobile platform speeds up to 120?km/h and multi path components, having calculated time delay spreads of up to 9?μs.