An Efficient Narrowband Interference Suppression Approach in Ultra-Wideband Receiver

Ultra-wideband (UWB) radio will be sharing the propagation environment with other pre-existing wireless systems, some possibly creating UWB multiple access interference, and others creating narrowband interference in the UWB radio bands. The Federal Communications Commission regulations have set conditions that limit the interference from the UWB radiators to other wireless systems, however, the issue of eliminating interference to the UWB radios from the pre-narrow band interference existing system is left to the ingenuity of the UWB radio designer. To optimize the performance of UWB wireless communication systems deteriorated by strong narrowband interferences, a high-efficiency interference suppression scheme is proposed in this paper. The closed-form weight coefficient iteration expression of basic adaptive notch filter cell with two constrained zero-pole pairs is derived. For multiple narrowband interferences case, a high-order cascaded adaptive interference suppression scheme is also presented. The simulation result demonstrates that the proposed narrowband interference suppression approach has excellent suppression effects to narrowband interferences in UWB systems, since a significant signal to noise ratio improvement is obtained. In addition, the proposed narrowband interference suppression algorithm is particularly fit for low-cost UWB wireless reception connected with Rake combining techniques.