5G高速场景下随机接入前导设计和检测  

Design and Detection of Random Access Preamble in 5G High-speed Scenario

作　　者：廖学富 席兵[1] 邓炳光[1] LIAO Xuefu;XI Bing;DENG Bingguang(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《电讯技术》2023年第3期416-420,共5页Telecommunication Engineering

基　　金：重庆市技术创新与应用发展专项重大主题专项(cstc2019jscx-zdztzxX0002)。

摘　　要：针对5G高速场景下随机接入前导检测过程中大频偏导致峰值移位和能量泄露的问题,利用双共轭ZC(Zadoff-Chu)序列,构造了一种新的随机接入前导来消除整数倍频偏带来的峰值移位问题,并提出了一种小数倍频偏补偿算法补偿小数倍频偏导致的峰值能量弥散。所提方案的检测性能满足5G标准要求,并且在加性高斯白噪声信道和抽头延迟线信道中,当频偏大于子载波间隔时,所提算法的漏检率性能相较于限制集算法分别提升了1.3 dB和1.5 dB;当频偏大于两倍子载波间隔时,在限制集算法失效的情况下所提算法仍可以正确检测出前导。In order to solve the problem of peak shift and energy leakage caused by large frequency offset during the random access preamble detection in 5G high-speed scenario,a new random access preamble is constructed by using two conjugate Zadoff-Chu(ZC)sequence to eliminate the problem of peak shifted caused by integer frequency offset,and a fractional frequency offset compensation algorithm is proposed to compensate the peak energy leakage caused by decimal frequency offset.The detection performance of the proposed scheme meets the requirements of 5G standard,and when the frequency offset is more than one subcarrier interval,the missed detection probability performance of the proposed algorithm is improved by 1.3 dB and 1.5 dB respectively,compared with the restricted set algorithm in additive white Gaussian noise channel and tapped delay line channel.When the frequency offset is greater than twice the subcarrier interval,the proposed algorithm can still correctly detect the preamble in the case of failure of the restricted set algorithm.

关 键 词：5G高速场景 随机接入 前导检测 频偏补偿 

分 类 号：TN929.5[电子电信—通信与信息系统]