基于fpga的数字无线信道仿真器的范围和缩放研究

Scott Buscemi, William V. Kritikos, R. Sass
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引用次数: 7

摘要

数字无线信道仿真器(DWCE)是一种能够模拟一组无线设备的射频环境的系统。当前设计的一个主要问题是,它们不能扩展到足够多的节点来模拟有意义的网络。缺乏可伸缩性的一个原因是这种系统需要大量的计算和网络容量。以前记录的DWCE系统实现了一种轮辐配置,禁止它们简单地添加额外的硬件来进行扩展。本文研究了使用FPGA集群配置为分布式系统,以提供计算和网络结构来扩展DWCE以支持1250个无线设备。这个规模大约比以前记载的任何其他系统都要大两个数量级。本文介绍了使用当前可用硬件的多个FPGA集群配置,并描述了用于通过网络路由信号和将计算硬件放置在每个FPGA上的算法。对低电平VHDL信号路径分量(SPC)进行了合成,并在不同参数下进行了映射,以插值其资源利用率。通过Xilinx工具链成功地运行了一个示例FPGA构建,其中有足够的spc来填充80%的FPGA资源,以确定FPGA系统的最大时钟速度。最后,给出了缩放结果,详细说明了各种尺寸的DWCE系统的最大采样频率,可用于检测各种无线设备。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Range and Scaling Study of an FPGA-Based Digital Wireless Channel Emulator
A Digital Wireless Channel Emulator (DWCE) is a system that is capable of emulating the RF environment for a group of wireless devices. A major issue with current designs is that they do not scale to a large enough number of nodes to emulate meaningful network. A reason for this lack of scalability is the large amount of computations and network capacity required for such a system. Previously documented DWCE systems implement a hub-and-spoke configuration that inhibits them from simply adding additional hardware to scale. This paper investigates the use of a FPGA cluster configured as a distributed system to provide the computational and network structure to scale a DWCE to support 1250 wireless devices. This scale is approximately two orders of magnitude larger than any other previously documented system. This paper presents multiple FPGA cluster configurations that use currently available hardware and describes the algorithms used to route the signals through the network and place the computational hardware on each FPGA. The low level VHDL Signal Path Component (SPC) is synthesized and mapped under different parameters to interpolate is resource utilization. One example FPGA build with enough SPCs to fill 80% of the FPGA resources is successfully run through the Xilinx tool-chain to determine the maximum FPGA system clock speed. Finally, the scaling results are presented that detail the maximum sample frequency of various sized DWCE systems which could be used to examine a variety of wireless devices.
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