Method for eliminating narrow-band interference in under-sampling rate pulse UWB (Ultra Wide Band) communication system

Abstract

The invention relates to a method and a device for eliminating the narrow-band interference in an under-sampling rate pulse UWB (Ultra Wide Band) communication system. The method comprises the following steps of: S1, sampling the received signal in which out-of-band noise in an information packet which does not contain a UWB signal is filtered to obtain a sampling vector y1 and calculating an orthogonal projection matrix of a narrow-band interference signal; and S2, sampling a subsequently received signal in which out-of-band noise in an information packet which contains a UWB signal is filtered to obtain a sampling vector yi and obtaining the UWB signal in which the narrow-band interference signal is eliminated based on the orthogonal projection matrix of an NBI (Narrow Band Imaging) signal. According to the method and the device disclosed by the invention, the NBI signal can be effectively eliminated, the signal-noise ratio is increased and the system sampling rate is far lower than the Nyquist sampling rate; and in addition, the estimation and elimination of the NBI are completely carried out in a digital domain without a parallel system structure or generation of a simulation projection signal, and thus the complexity and the realization difficulty of the system are greatly reduced.

Description

technical field [0001] The present invention relates to the field of wireless communication, more specifically, to a method and device for eliminating narrow-band interference in an under-sampling rate pulse UWB communication system. Background technique [0002] Pulse ultra-wideband (UWB) technology, as a wireless communication technology solution, has broad application prospects in wireless sensor networks and high-precision positioning and navigation systems due to its advantages of low complexity, low cost, and high positioning accuracy. In order to share the frequency spectrum with the existing narrowband system, the transmission power spectrum density of the UWB system is extremely low, much lower than that of the narrowband system. However, for UWB communication, narrowband signal is a kind of interference, and the power is very high, narrowband interference (NBI) will seriously affect the performance of UWB system. Therefore, the estimation and elimination of NBI is...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a method for eliminating narrow-band interference in an under-sampling rate pulse UWB communication system in view of the high complexity of NBI estimation and elimination methods in existing UWB communication systems. After filtering the out-of-band noise, the signal is sampled at low speed, and the NBI signal estimation and elimination are completely performed in the digital domain, and the system complexity is low and easy to implement

Images