IR-UWB通信系统的准自适应频率同步算法

Quasi-adaptive frequency synchronous method for IR-UWB system

肪冲无线电超宽带通信(impulse radio-ultra wideband,IR-UWB)通信采用亚纳秒级脉冲承载信息。由于没有传统意义上的载波,其同步方式与传统方式有着很大不同,特别是频率同步面临着很大的挑战。在正交正弦相关接收机基础上提出了一种准自适应频率同步方法。该方法利用接收方本地载波和接收脉冲进行相关得到的矢量进行相差估计,根据估计得到的相位差的象限选择不同的预设步长进行频率调整接收方本地振荡器频率,实现收发双方的频率同步。该方法具有实现简单、同步速度快的优点,并在硬件系统上得到验证,取得了良好的效果。

Impulse radio-ultra wideband （IR-UWB） communication systems use sub-nano second pulses for information transmission. Its synchronization method is different from the traditional system especially in frequency synchronization due to carrier-less work mode. A quasi-adaptive frequency synchronous mechanism based on an orthogonal sinusoidal correlation receiver is proposed. Phase gap is estimated by the correlation results from the local oscillator and received pulses, and the receiver changes the frequency of the local oscillator with different preset steps based on the phase quadrant obtained from estimation. Experiments show that quick synchronization and good performance are achieved with this simple algorithm.