5G NR小区搜索中一种频域相关快速同步算法

5G系统中随着带宽的不断增大，信号所承载的数据也在不断增加，LTE中定时同步方法应用在5G中增加了计算量。为了解决这个问题，提出了叠加与频域快速相关联合检测算法。该算法利用PSS信号(Primary Synchronization Signal, PSS)M序列特性，将本地3组PSS时域信号相加运算，然后进行频域转换，通过频域快速相关运算得到峰值位置，可以检测出粗同步点，再经过运算得到精同步点和小区组内ID号。数据分析表明，叠加与快速频域相关算法与经典算法相比在低信噪比环境下检测概率提升了约10%,算法复杂度降低了94.86%。

A fast synchronization algorithm based on frequency domain correlation in 5G NR cell search

With the continuous increase of bandwidth in 5G system,the data carried by the signal also becomes larger and larger.The application of timing synchronization method in LTE increases the amount of computation in 5G.To solve the problem, a joint detection algorithm of superposition and fast correlation in frequency domain is proposed.The improved algorithm utilizes primary synchronization signal(PSS) M sequence feature to add the local three sets of PSS time domain signals,and then performs frequency domain conversion,and obtains the peak position through the frequency domain fast correlation operation,which can detect coarse synchronization point.After calculation,the fine synchronization point and the ID number in the cell group are obtained.Data analysis shows,compared with that of the classical algorithm,the detection probability of the proposed algorithm is improved by about 10% and the algorithm complexity is reduced by 94.86% in the low signal-to-noise ratio(SNR) environment.