超宽带频率非平稳信道硬件实时模拟研究

利用信道模拟器在实验室复现电波传播环境是超宽带通信设备测试的重要手段。 本文针对超宽带信道的频率非平稳 特性,提出了一种基于频域平稳区间叠加的超宽带信道模型,并据此设计了基于软件无线电平台的硬件实时模拟系统。 该系统 使用多路数据并行处理架构实现对高速率数据的实时处理,并引入迭代算法和时分复用结构,既保证信道衰落生成的实时性也 降低了硬件资源消耗。 实测结果表明,本文模拟器可支持模拟 600 MHz 的超宽带信道衰落,信道衰落谱型与理论仿真结果吻 合,并且输出的信道冲激响应与实测结果基本一致。 该系统可为超宽带通信系统的优化、验证和评估提供一种有效的手段。

On hardware real-time emulation of frequency non-stationary UWB channels

The use of channel simulators to reproduce the radio wave propagation environment in the laboratory is an important means to test ultra-wideband (UWB) communication equipment. Aiming at the frequency nonstationary characteristics of UWB channels, a UWB channel model based on stationary interval superposition in frequency domain is proposed in this paper, and a hardware real-time simulation system based on software radio platform is designed. The system uses a multi-channel data parallel processing architecture to realize real-time processing of high-rate data, and introduces an iterative algorithm and a time division multiplexing structure, which not only ensures real-time generation of channel fading but also reduces hardware resource consumption. The measured results show that the simulator can simulate and output the 600 MHz ultra-wideband signal after superposition non-stationary fading in real time. The measured results show that the simulator can support the simulation of 600 MHz UWB channel fading, the channel fading spectrum is consistent with the theoretical simulation results, and the output channel impulse response is basically consistent with the measured results. The system can provide an effective means for optimization, verification and evaluation of ultra-wideband communication systems.