单用户TH-SS PPM超宽带系统同步跟踪方法

目前超宽带系统均假设接收机解凋时已获得发射机与接收机之间准确的传播时延，而任何系统的接收机要得到准确时延是不可能的，收发双方必然存在同步误差．文中针对这一点，提出了一种单用户TH—SS PPM超宽带系统的同步跟踪方法，给出了系统原理框图，描述了系统的工作原理，计算机仿真给出了在不同初始同步误差、不同采样间隔、不同信噪比情况下，系统同步跟踪结果，仿真结果证明采样间隔越小、信噪比越大，系统的同步精度越高。

A synchronization timing tracking scheme for single user TH-SS PPM ultra wide band system

To date the propagation delay between the transmitter and the receiver is assumed to be perfectly known at the receiver of ultra wide band (UWB) systems. Actually it is impossible for UWB systems to do this because the synchronization timing error must exist between the receiver and the transmitter. Proposed is a synchronization timing tracking scheme for a single user time hopping-spread spectrum pulse position modulation(TH-SS PPM) UWB system. The system framework is described and how it works in details. Computer simulations present system synchronization timing tracking results at the situations of different initial synchronization timing error,sampling interval and signal-to-noise ratio. Simulation results indicate that the less the sampling interval and the greater the signal to noise ratio, the better the system synchronization result.