摘要
In response to the downlink synchronization requirements of the user equipment(UE)or third-party radio equipment in fifth-generation(5G)mobile communication systems,a synchronization algorithm of primary synchroni-zation signal(PSS)was designed and developed in the 5G system based on block cross-correlation.According to the new characteristics of the 5G synchronization channel and broadcast channel,starting from the traditional downlink synchronization algorithm of long-term evolution(LTE),the detection performance of the algorithm under a low signal-to-noise ratio(SNR)is improved by introducing an incoherent accumulation,and the new scheme of joint coarse frequency offset estimation is used to improve the frequency offset estimation performance.Finally,the performance of the proposed synchronization algorithm is verified by conducting a simulation on a 5G downlink simulation platform based on MATLAB software.Simulation results show that the improved downlink synchronization algorithm has stable performance in the tapped delay line-C(TDL-C)and additive white Gaussian noise(AWGN)channels with large frequency deviation and low SNR.
在第五代移动通信系统(5G)下,针对终端(UE)或第三方无线电设备对下行同步的需求,设计开发了基于分块互相关的主同步信号(PSS)的同步算法.根据5G同步信道与广播信道的新特性,从传统的长期演进(LTE)下行同步算法出发,通过引入非相干积累来提升算法在低信噪比(SNR)下的检测性能,利用粗频偏联合估计的新方案提升频偏估计性能.最后,在基于MATLAB软件建立的5G下行链路级仿真平台上进行仿真试验,以验证所提算法的性能.仿真结果表明,改进后的下行同步算法在大频偏和低信噪比的抽头延迟线(TDL-C)模型以及加性高斯白噪声(AWGN)信道下都有着稳定的性能.
基金
The Social Development Projects of Jiangsu Science and Technology Department(No.BE2018704).
