基于MRLS的低轨卫星移动通信随机接入前导检测系统设计  

Design of Random Access Preamble Detection System for LEO Satellite Mobile Communication Based on MRLS

作　　者：韩芳 郭文明 陈晓飞 HAN Fang;GUO Wenming;CHEN Xiaofei(College of Information Engineering,Xinjiang Institute of Engineering,Urumqi 830023,China;School of Computer Science,Beijing University of Posts and Telecommunications,Beijing 100876,China)

机构地区：[1]新疆工程学院信息工程学院,乌鲁木齐830023 [2]北京邮电大学计算机学院,北京100876

出　　处：《计算机测量与控制》2021年第11期61-64,83,共5页Computer Measurement &Control

基　　金：教育厅教育改革项目(PT-2021063)。

摘　　要：由于现有低轨卫星移动通信发送的信号在随机接入前导检测系统时存在检测延时过长、检测准确率较低的问题,提出基于MRLS的随机接入前导检测系统的设计研究;分别对前导格式器、前导序列器、前导信号持续时间计算器和随机信号发送器进行优化;根据MRLS算法进行差分检测和相关性检测,利用共轭运算计算加入子载波偏移频率参数,完成随机接入前导检测系统;实验结果表明:所设计的检测系统延时时间始终不超过0.002 m,最低误检率为10^(-4)%,误检率低于对比系统,检测效果能够更好地适应低轨卫星移动通信系统。Due to the problems of long detection delay and low detection accuracy when the signal sent by the existing LEO satellite mobile communication is randomly connected to the preamble detection system,the design and research of the random access preamble detection system based on MRLS is proposed.The preamble formatter,preamble sequencer,preamble duration calculator and random signal transmitter are optimized respectively.Differential detection and correlation detection are carried out according to MRLS algorithm,and the subcarrier offset frequency parameters are calculated and added by conjugate operation to complete the random access preamble detection system.The experimental results show that the delay time of the designed detection system is always less than 0.002 m,the minimum false detection rate is 10^(-4)%,and the false detection rate is lower than that of the comparison system.The detection effect can better adapt to the LEO satellite mobile communication system.

关 键 词：MRLS 低轨卫星 移动通信 随机接入 前导检测 检测系统 

分 类 号：TN92[电子电信—通信与信息系统]