基于时域干扰消除和能量RAKE接收的超宽带窄带干扰抑制算法

Narrowband Interference Rejection in IR-UWB System Based on Interference Cancellation in Time Domain and Energy RAKE Receiver

针对脉冲超宽带通信中的窄带干扰问题,根据超宽带信号为时域极窄脉冲而窄带干扰为连续波这一主要特点,提出了一种基于时域干扰消除和能量RAKE接收技术的超宽带时域窄带干扰抑制算法。首先,通过终端开路或者短路的传输线延时特定长度,与原始信号叠加实现了时域窄带干扰抑制,该方法克服了传统陷波法抑制干扰过程中也损失信号的缺点;然后,针对干扰抑制完成后人为引入的多径信号,采用了一种结构简单,计算复杂度较低的能量RAKE接收机。仿真结果表明,该接收机能够对多径信号进行能量的收集,且具有结构简单,计算复杂度较低的特点。

Aiming at the problem of narrowband interference in IR-UWB system, considering the UWB signal is extreme narrow pulse while narrowband interference is continuous wave, a new method combined time domain interference cancellation with energy RAKE receiver for narrowband interference rejection is presented. First, interference rejection in time domain is adopted through signal overlaying of original and delayed signal using transmission line with terminal open or short circuits. Compared with the traditional method with notch filter, the proposed method is able to suppress the interference without the loss of desired signal. Then, a simple and low complexity energy RAKE receiver is introduced to solve the problem of multi-path caused by the time domain RFI. The simulation results prove that the receiver can collect the multi-path signal effectively with simple structure and low-complexity algorithm.