LTE系统中一种低复杂度的PSS定时同步算法

A low-complexity PSS time synchronization algorithm in LTE system

摘要:

研究了长期演进技术(LTE)系统下行链路中的PSS定时同步。针对传统PSS定时同步算法将接收信号与本地PSS信号在时域进行匹配滤波，计算复杂度较高的问题，提出了一种分段频域相关算法。该算法将接收时域数据分段做FFT，转换到频域进行相关检测。多径信道下仿真结果表明，选择分段间隔为512时，所提算法与传统算法相比，在保证同步性能相当的情况下，可大大降低计算复杂度(约94%)。

Abstract:

This paper researches a Primary Synchronization Signal(PSS) timing synchronization algorithm for downlink of Long Term Evolution(LTE) system. The conventional PSS timing algorithm applies the matched filter method to received signals and the local PSS in time domain, therefore its computational complexity is large. A partition frequency domain correlation algorithm is proposed, which performs the detection by through dividing the received signal into several parts and transforming these parts to frequency domain by FFT. Simulation results under multi-path conditions show that, compared with the conventional algorithm, the proposed algorithm can get comparative performance and cut the computational complexity by about 94% with the space between two adjacent parts of 512.