一种改进的5G系统主同步信号同步算法

Improved PSS Synchronization Algorithm of Primary Synchronization Signal for 5G System

针对现有5G系统主同步信号同步算法在大频偏情况下的同步性能较差的问题,本文提出一种基于快速傅里叶变换(Fast Fourier Transform,FFT)的联合检测算法,通过对传统互相关算法中的共轭相乘结果进行FFT变换,记录变换后的峰值,遍历所有峰值找到同步点,得出小区组内号,再进行载波频偏的估计.仿真结果及复杂度分析表明,改进算法不仅具有很强的抗频偏能力,尤其对于大频偏下的情况,同时完成载波频偏的估计,所增加复杂度在可接受范围内且检测性能稳定.

Due to the poor synchronization performance of the existing synchronization algorithm of the main synchronization signal in 5G system under the condition of large frequency offset.A joint detection algorithm based on Fast Fourier Transform(FFT)is proposed.The FFT transform is carried out on the conjugate multiplication result of the conventional cross-correlation algorithm,and the transformed peak value is recorded,and all peaks are traversed to find the synchronization point,and then the intra-cell number is obtained,and then the carrier frequency offset is estimated.Simulation results and complexity analysis show that the improved synchronization algorithm not only has strong frequency offset resistance,especially for large frequency offset,but also obtains the estimated frequency offset.The increase complexity is within an acceptable range and the detection performance is stable.