双信道模型下的自动增益控制策略设计  

Design of automatic gain control strategy under two-channel model

作　　者：李雨洋 张涛 关汉兴 盛玉霞[1] Li Yuyang;Zhang Tao;Guan Hanxing;Sheng Yuxia(Engineering Research Center of Metallurgical Automation and Measurement Technology,Wuhan University of Science and Technology,Wuhan 430081,China;Yangtze Optical Fibre and Cable Joint Stock Limited Company,Wuhan 430000,China)

机构地区：[1]武汉科技大学冶金自动化与检测技术教育部工程研究中心,湖北武汉430081 [2]长飞光纤光缆有限公司,湖北武汉430000

出　　处：《电子技术应用》2019年第4期87-91,共5页Application of Electronic Technique

基　　金：国家自然科学基金项目(61501337)

摘　　要：针对通信环境复杂、d PMR数字对讲机基带接收信号峰均比过大的问题,提出了一种可同时对经过高斯信道和瑞利信道处理的信号进行自动增益控制的策略。该控制策略采用反馈型的数字自动增益控制(DAGC)结构,基于滑动平均检测算法和LSLDAGC增益控制算法进行优化,通过信号判决模块和有限增益调整机制提高处理衰落信号时的系统稳定性,降低了信号误判率。经仿真结果分析,验证了AGC系统可对平稳和衰落信号进行增益控制,具有96 dBm的大动态范围、小于6.25 ms的收敛时间和-105 dBm的灵敏度,同时,在信号功率波动时具有良好的稳定性和跟踪性。Aiming at the problem that the communication environment is complex and the peak-to-average ratio of the baseband receiving signal of dPMR digital intercom is too large,a strategy for automatic gain control of signals processed by Gaussian chan-nel and Rayleigh channel is proposed.The control strategy adopts feedback DAGC.The structure is optimized based on the moving average detection algorithm and the LSLDAGC gain control algorithm.The signal decision module and the finite gain adjustment mechanism are used to improve the system stability of the processing of the fading signal,and the signal misjudgment rate is re-duced.The simulation results show that the AGC system can control the gain of stationary and fading signals with a large dynamic range of 96 dBm,a convergence time of less than 6.25 ms and a sensitivity of-105 dBm.At the same time,it has good stability and tracking performance when the signal power fluctuates.

关 键 词：自动增益控制 瑞利信道 高斯信道 dPMR协议 

分 类 号：TN929.54[电子电信—通信与信息系统]