无线传感网OFDM系统中信道均衡器的电路实现  

A Circuit Implementation of Channel Equalizer in WSN-OFDM System

作　　者：瞿晓[1] 奚锦程[1] 刘新宁[1] 

机构地区：[1]东南大学国家专用集成电路系统工程技术研究中心,南京210096

出　　处：《电子器件》2015年第5期1052-1057,共6页Chinese Journal of Electron Devices

基　　金：国家863计划项目(2012AA012703);可重构处理器的外设控制机理和程序引导技术研究及实现

摘　　要：信道均衡器是无线传感网OFDM系统的关键部分,传统均衡器设计在信道估计精度或电路复杂度上效果不佳。为使均衡器更精确、复杂度更低,采用快速LMMSE算法进行信道估计与均衡,定制了精简的20位浮点数进行均衡器电路设计。电路经过综合、仿真与FPGA验证,结果表明,均衡器电路复杂度低,性能显著提高。相比于传统LS算法均衡器,在资源消耗仅增加27.27%的情况下,16 d B载噪比下误码率降低了89.8%,实现了低复杂度高性能的均衡器电路。Channel equalizer is a key part of OFDM system in Wireless Sensor Networks. Traditional equalizer often comes with low performance or very high complexity. In order to design a high performance equalizer with low com- plexity, a fast LMMSE algorithm is applied in the design. And dedicated 20-bit float operators is designed to gain very high performance and low complexity. After synthesis, simulation and FPGA verification, result shows that the complexity of the equalizer is only 27.27% higher compare to simple LS equalizer while the bit error rate is reduced by 89.8%.

关 键 词：无线传感网 正交频分复用 信道均衡器 快速LMMSE算法 电路实现 

分 类 号：TN926[电子电信—通信与信息系统] TP393.17[电子电信—信息与通信工程]