Analog and flexible digital suppression of narrow-band interference in UWB

The large bandwidth and low power level of UWB make it vulnerable to interference. Particularly in a cell phone the interference levels are high. These high interference levels require strong interference suppression. In this paper we propose a new approach for interference suppression in UWB. This approach combines analog suppression with flexible digital suppression in a UWB receiver. To suppress strong interference, analog and digital band reject filtering is combined with tone nulling. For weak interference only tone nulling is applied. We use system simulations to maximize the interference robustness of a UWB receiver for practically relevant interference models, while minimizing the use of the band reject filters. We show that our interference suppression scheme improves the interference tolerance by at least 35 dB.