基于降采样的低复杂度小区搜索算法

he cell search process includes the detection of Primary Synchronization Signal and Secondary Synchronization Signal. The PSS(Primary Synchronization Signal) is composed of ZC sequence, which has good correlative properties to timing 5ms of the cell, but the complexity of the detection algorithm is relatively high.This paper designs and realizes a kind of Primary Synchronization Signal detection algorithm which is based on filter and down-sampling. The algorithm meets the time and high performance request of the cell search algorithm and reduces the computing complexity at the same time. The algorithm uses several method such as match filter, sampling, cyclic convolution in frequency domain instead of correlation in time domain,and finally detected the PSS signal efficiently .The simulation shows that the algorithm reduces the computing complexity and gains a good performance under the AWGN and MIMO channel which is also useful in the actual application scenario.