Interference mitigation techniques in transmitted reference UWB system used in WPANs NLOS channel environment

In this paper, studies are performed and techniques are proposed for interference mitigation in Transmitted Reference ultra wideband (TR-UWB) system. The best method for suppressing and reducing the mutual interference is without modifying interfering systems. The coexistence of multisystem is given by: (a) Interference reduction from UWB systems to other narrowband (single and multiple) and wideband systems. (b) Interference reduction from other narrowband (single and multiple) and wideband systems to UWB systems. The TR-UWB signal using AcR based multi-resolution technique is used to avoid its interference to other wireless systems. By using a notch filter the reverse interference is alleviated at frontend of UWB receiver which is having much smaller bandwidth as Gaussian pulse-shaped multi-resolution environment. The BER performance of AcR receiver and modified TR-UWB receiver are investigated on AWGN and IEEE 802.15.3a UWB channel models. We show that for a modified TR-UWB receiver operating at low to medium SNR´s, the system performance increases as the single NBI are perfectly suppressed, while at high SNR´s the system still performs satisfactorily in presence of multiple narrowband and wideband interference using modified receiver structure in NLOS channel environment.