一种实现下行同步序列快速搜索的新方法

针对无线通信系统中下行同步序列（summarized the existing downlink synchronization sequence，SYNC_DL）的搜索方法和对其计算复杂度方面存在的问题进行了分析。结合系统帧结构的特点，设计了一种基于逻辑特征窗的低复杂度SYNC_DL搜索方法，该方法通过逻辑特征窗的设置，将大量的数值计算转化为逻辑运算，从而减少了计算量。数值仿真结果表明,与传统方法相比，该方法在高信噪比环境下能更有效地进行下行同步序列的搜索，但在低信噪比环境下，该方法的正确率会明显降低。

A new method for downlink synchronization sequence fast searching

In this paper,we summarized the existing downlink synchronization sequence(SYNC_DL)searching methods in wireless communication system and analyzed the problem of computational complexity. According to the characteristics of the system frame structure, a kind of SYNC_DL searching scheme based on the logical characteristic window which can reduce the computational complexity is designed. By setting logical characteristic window,this method transforms mass numerical computation into logical computation which can reduce the computational complexity .The simulation results reveal that this method can complete downlink synchronization sequence searching more efficiently than traditional methods in high SNR environment, but the success ratio will decline obviously in low SNR environment.