GSM多功能基站中信道估计与均衡的设计及FPGA实现  

Design of channel estimation and equilibrium applied to GSM multi-functional base station and its implementation based on FPGA

作　　者：张云丰 万国金[1] 黄云鲲 ZHANG Yunfeng;WAN Guojin;HUANG Yunkun(School of Information Engineering,Nanchang University,Nanchang 330031,China)

机构地区：[1]南昌大学信息工程学院

出　　处：《现代电子技术》2019年第13期1-4,共4页Modern Electronics Technique

基　　金：国家自然科学基金(61661030);江西省自然科学基金资助项目(20151BAB207006,20151BAB207052)~~

摘　　要：为消除移动信道中因多径效应导致严重的码间干扰(ISI)的影响,设计适用于GSM多功能基站的信道估计与均衡的FPGA实现方案。该设计包含信道估计、匹配滤波及信道均衡三个子模块,提出在均衡模块前使用信道冲激响应总能量的5%作为匹配滤波器抽头系数的判决门限,可减少信道估计的误差,提升均衡效率。通过对某企业采集的实际空中信号数据进行FPGA的时序仿真及板级验证,结果表明该设计能很好地克服码间干扰的问题,并在Xilinx公司的7K325T开发板上实现,将其接入GSM多功能基站,系统能够快速准确地侦听手机的语音信号。In order to eliminate the impact of serious inter-symbol interference (ISI) caused by multipath effect in the mobile channel,an FPGA-based implementation scheme of channel estimation and equilibrium is designed,which is suitable for GSM multi-functional base station. The module design includes the sub-modules of channel estimation,matched filtering and channel equalization. 5% of the total energy of channel impulse response used in front of equalization module is taken as the decision threshold of the matched filter tap coefficient, which can reduce the channel estimation error and improve the equalization efficiency. The time sequence simulation and board level verification of FPGA are performed for real air signal data collected from a company. The results show that the design can overcome the ISI effectively,and be implemented on 7K325T development board made in Xilinx Company. If the equalizer is connected to a GSM multi-functional base station,the multi- functional base station can quickly and accurately monitor the voice signal of mobile phones.

关 键 词：ISI 信道估计 匹配滤波 信道均衡 时序仿真 板级验证 

分 类 号：TN929.5-34[电子电信—通信与信息系统]