可扩展多输入多输出信道高效模拟器研制

Flexible and efficient emulator for multiple-input multiple-output channels

针对现有信道模拟器通道规模受限、扩展性差等缺陷,设计实现了一种可扩展的多输入多输出(multiply-input multiply-output, MIMO)信道高效模拟器。该模拟器采用改进的坐标旋转数字计算(coordinate rotation digital computer, CORDIC)算法,只需较少硬件资源便可实现大规模多支路的随机信道衰落精确模拟。基于MIMO信道离散化模型提出了一种可扩展的硬件模拟架构,并结合现场可编程门阵列(field-programmable gate array, FPGA)的并行处理优势,进行硬件实现及实测验证。针对3GPP标准扩展车载A信道模型(extended vehicular A model, EVA)静态场景和时变场景的实测结果表明,所研制的MIMO信道模拟器输出时延功率谱和多普勒功率谱等统计特性均与理论值吻合,可用于无线通信设备的方案验证、算法优化和性能分析。

For the limitations of existing channel emulators on the channel numbers and scalability,a flexible emulator for multiple-input multiple-output(MIMO)channel is designed and implemented.By adopting an improved coordinate rotation digital computer(CORDIC)algorithm,the emulator can generate large number of accurate random channel fading in real-time,but consumes less hardware resources.On this basis,a flexible hardware framework based on the MIMO discrete channel model is also developed.With the advantages of field-programmable gate array(FPGA)on parallel processing,the emulation framework is implemented on a FPGA platform.Hardware measurements are conducted with the parameters of extended vehicular A model(EVA)in 3GPP standard.The test results for both static and time-variant scenarios show that the output statistical properties of proposed emulator,i.e.,power delay profiles(PDP)and Doppler power spectrum densities(DPSD)are consistent well with the theoretical ones.Thus,it can be applied on the design verification,algorithm optimization,and performance evaluation of wireless communication devices.