基于MRLS的低轨卫星移动通信随机接入前导检测系统设计

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0.002m,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.

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

Due to the problems of long detection delay and low detection accuracy in the existing random access preamble detection system for LEO satellite mobile communication, a 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. The differential detection and correlation detection are carried out according to MRLs algorithm, and the subcarrier offset frequency parameters are calculated by conjugate operation to complete random access to the preamble detection system. The experimental results show that: compared with the existing detection system, the designed detection system can well reduce the detection delay time, has higher inspection accuracy, and can better adapt to the LEO satellite mobile communication system, with good detection effect and strong practicability.