基于长循环前缀搜索的5G上行控制信道同步算法

5G uplink control channel synchronization algorithm based on long CP search

针对现代信号分析仪中5G新空口(NR)信号物理层的调制质量测试需求,并为了解决5G NR上行控制信道的同步问题,通过对5G NR物理层协议中的帧结构以及上行控制信道的特征分析,设计了一种基于长循环前缀搜索和解调参考信号参数盲检的同步算法。首先利用长循环前缀搜索确定出半子帧的起始位置,再由此位置结合时频分布特征提取解调参考信号,然后生成本地解调参考信号对其进行参数盲检,由盲检得出的时隙索引进一步确定出半子帧的索引,从而实现对帧起始位置的确定。最后利用信号分析仪采集数据并对算法进行仿真实验,结果表明算法可以有效实现5G NR上行控制信道的同步过程,并且计算量仅为传统算法的1%。

Aiming at the modulation quality test requirements of 5G NR signal physical layer in modern signal analyzer,and in order to solve the synchronization problem of 5G NR uplink control channel,a synchronization algorithm based on long-cycle prefix search and blind detection of demodulation reference signal parameters is designed by analyzing the frame structure in 5G NR physical layer protocol and the characteristics of uplink control channel.First,the start position of the half subframe is determined by using the long cyclic prefix search,and then the demodulated reference signal is extracted from this position in combination with the time-frequency distribution characteristics,and then the local demodulated reference signal is generated for parameter blind detection.The time slot index obtained from the blind detection further determines the index of the half subframe,thus realizing the determination of the start position of frame.Finally,the signal analyzer is used to collect data and carry out simulation experiments on the algorithm.The results show that the algorithm can effectively realize the synchronization process of 5G NR uplink control channel,and the calculation amount is only 1%of the traditional algorithm.