一种改进的5G新空口小区搜索检测算法  

An Improved 5G New Radio Cell Search and Detection Algorithm

作　　者：刘慧 刘祖深 许虎 LIU Hui;LIU Zushen;XU Hu(School of Instruments and Electronics,North University of China,Taiyuan 030051;CETC Ceyear Technologies(Anhui)Co.,Ltd.,Bengbu 233010;Bengbu Technology Innovation Center on Electronic Measurement Instrumentation Technology,Bengbu 233010)

机构地区：[1]中北大学仪器与电子学院,太原030051 [2]中电科思仪科技(安徽)有限公司,蚌埠233010 [3]电子测量仪器技术蚌埠市技术创新中心,蚌埠233010

出　　处：《计算机与数字工程》2023年第11期2493-2499,2504,共8页Computer & Digital Engineering

摘　　要：5G NR系统中,小区搜索是时频资源同步解调不可或缺的流程。传统同步算法存在时域互相关、分段相关,计算繁琐且高频偏下检测准确率下降,对此论文提出了一种改进型PSS检测算法,将本地三组PSS序列对应叠加,并根据PSS序列时域共轭对称特性,取叠加后的前一半序列共轭相关,相关结果分段计算后再差分累加。此外,为了降低SSS检测的复杂度,摒弃了传统的冗余互相关,采用哈达玛积运算。论文算法降低运算量的同时,在一定程度降低了频偏累积的影响,且提升了系统的抗频偏能力。为了验证算法的性能,将论文算法和传统算法在加性高斯白噪声AWGN(Additive White Gauss⁃ian Noise)信道下进行仿真对比,仿真结果表明,相较于传统算法,论文算法的抗频偏性能及检测效率得到明显提升。In 5G NR system,cell search is an indispensable process of time-frequency resource synchronous demodulation.The traditional synchronization algorithm has time-domain cross-correlation and piecewise correlation,the calculation is cumber⁃some,and the detection accuracy is reduced under high frequency deviation.Therefore,an improved PSS(Primary Synchronization Signal)detection algorithm is proposed in this paper.The local three groups of PSS sequences are superimposed correspondingly.According to the time-domain conjugate characteristics of PSS sequences,the conjugate correlation of the first half of the superim⁃posed sequences is taken,and the correlation results are segmented in frequency domain and then differentially accumulated.In ad⁃dition,in order to reduce the complexity of SSS(Secondary Synchronization Signal)detection,the traditional redundant cross-corre⁃lation is abandoned and Hadamard product operation is adopted.This algorithm reduces the amount of computation,reduces the in⁃fluence of frequency offset accumulation to a certain extent,and improves the anti-frequency offset ability of the system.In order to verify the performance of the algorithm,the proposed algorithm and the traditional algorithm are simulated and compared in AWGN(Additive White Gaussian Noise)channel.The simulation results show that the anti-frequency offset performance and detection effi⁃ciency of the proposed algorithm are significantly improved compared with the traditional algorithm.

关 键 词：小区搜索 PSS 差分累加 SSS 哈达玛积 

分 类 号：TN929.5[电子电信—通信与信息系统]