A novel NBI suppression scheme for UWB communications using multiple receive antennas

Abstract

In this paper, a narrowband interference (NBI) mitigation scheme for ultra-wide bandwidth (UWB) signals using multiple receive antennas is examined. The low spatial fading of UWB signals compared to NBI signals is exploited to provide "interference diversity". Whereas classical diversity techniques are designed to increase the desired received signal power, the aim of interference diversity is to minimize the effective NBI power. Selection diversity (SD), equal gain combining (EGC) and maximal ratio combining (MRC) methods are investigated. It is shown that SD and ECG result in a 3-dB performance improvement when the number of receive antennas is doubled. Also, MRC yields additional gains over SD and ECG. The proposed methods are mathematically analyzed, then verified by simulation.