作　　者： ; ; ;

机构地区： 东南大学信息科学与工程学院移动通信国家重点实验室

出　　处： 《电波科学学报》 2006年第2期215-219,共5页

摘　　要： 提出了一种新的直扩超宽带系统码片同步方法,通过设计具有重复特性的码来提高观察窗中信号的信噪比,将码片同步后窗口中的信息作为接收端本地信号与接收信号进行匹配接收,提高接收信噪比。PN码捕获门限根据接收信号的功率大小自适应调整。理论分析和仿真结果表明新方案有效降低了捕获时间而且可以获得与理想同步可比拟的误比特率性能。 A novel chip acquisition scheme was proposed for DS-UWB system. A preamble with repetition property was employed to improve the signal to noise ratio in the energy window. Once chip acquisition achieved, the multipath components could be acquired by utilizing the samples in energy window as the local template waveform. The threshold setting was adaptive with the power of the received sig- nal. Analysis and simulation results indicate that the proposed scheme reduce acquisition time significantly and acquire BER performance comparable with perfect synchronization.

关 键 词： 超宽带通信 同步 能量窗 自适应门限

领　　域： [电子电信] [电子电信]