一种基于PSS序列的OFDM系统低复杂高精度帧同步方法及其FPGA实现

A Low Complex and High Precision Frame Synchronization Method for OFDM System Based on PSS Sequence and Its FPGA Implementation

摘要: 无线帧同步是OFDM系统中的关键技术之一，只有在基站与用户之间通过帧定时同步，确定无线帧的起始点才能顺利进行后续的通信信号处理，同步精度直接影响到系统的信号处理的性能，同时如何降低算法的复杂度，减少硬件资源的消耗，也是算法设计所必须考虑的重点问题。针对上述问题，本文提出一种低复杂高精度帧同步算法，该算法在传统的无线帧同步基础上，仅添加一个复数乘法器、两个累加器以及相关逻辑模块，即可实现基于PSS序列的低复杂高精度无线帧同步，同时本文使用LabVIEW FPGA语言在硬件上实现了该算法，并且在实际的MIMO-OFDM系统中部署，算法运行效果稳定有效。

Abstract: Wireless frame synchronization is one of the key technologies in OFDM system. Only through frame synchronization between the base station and the user and the starting point of the wireless frame is found, communication signal can be successfully processed. Synchronization precision directly affects the performance of signal processing in the system. At the same time, how to reduce the complexity of the algorithm and reduce the consumption of hardware resources is also a key problem that must be considered in the algorithm design. In view of the above problems, a low complex and high precision frame synchronization algorithm is proposed in this paper. On the basis of traditional wireless frame synchronization, the algorithm only adds a plural multiplier, two accumulators and related logic modules. It can implement low complex and high precision wireless frame synchronization based on PSS sequence. Meanwhile, this paper implements the algorithm in hardware using LabVIEW FPGA language and the algorithm is deployed in the actual MIMO-OFDM system, operating stably and effectively.