Singular Value Decomposition-Based Algorithm for Suppression of IEEE 802.11 a Interference in Multiple Access TH-UWB Systems

Coexisting with other narrowband services, the performance of ultra wideband (UWB) systems will be affected considerably due to the high power of these narrow-band signals. Specifically, IEEE 802.11a systems which operate around 5 GHz and overlap the band of UWB signals will interfere with UWB systems significantly. In this paper, we suggest a novel narrow-band interference (NBI) suppression technique based on the singular value decomposition (SVD) algorithm in multi-access time hopping UWB (TH-UWB) systems. SVD is used to approximate the NBI which then is subtracted from the received signals. Pulse amplitude modulation (PAM) and pulse position modulation (PPM) are considered. In contrast to the conventional suppression methods such as the notch filter and the maximal-ratio combining partial RAKE (MRC PRAKE) receiver, our proposed technique is simple and robust, the hardware complexity of the receiver can be reduced greatly even in the presence of multi-access interference (MAI).