Abstract
With the rapid development of wireless communication systems and electronic techniques, the limited frequency spectrum resources are shared with various wireless devices, leading to a crowded and challenging coexistence circumstance. Cognitive radio (CR) and ultra-wide band (UWB), as sophisticated wireless techniques, have been considered as significant solutions to solve the harmonious coexistence issues. UWB wireless sensors can share the spectrum with primary user (PU) systems without harmful interference. The in-band interference of UWB systems should be considered because such interference can severely affect the transmissions of UWB wireless systems. In order to solve the in-band interference issues for UWB wireless sensor networks (WSN), a novel in-band narrow band interferences (NBIs) elimination scheme is proposed in this paper. The proposed narrow band interferences suppression scheme is based on a novel complex-coefficient adaptive notch filter unit with a single constrained zero-pole pair. Moreover, in order to reduce the computation complexity of the proposed scheme, an adaptive complex-coefficient iterative method based on two-order Taylor series is designed. To cope with multiple narrow band interferences, a linear cascaded high order adaptive filter and a cyclic cascaded high order matrix adaptive filter (CCHOMAF) interference suppression algorithm based on the basic adaptive notch filter unit are also presented. The theoretical analysis and numerical simulation results indicate that the proposed CCHOMAF algorithm can achieve better performance in terms of average bit error rate for UWB WSNs. The proposed in-band NBIs elimination scheme can significantly improve the reception performance of low-cost and low-power UWB wireless systems.
Highlights
IntroductionElectronics and sensor networks technologies have evolved dramatically in the past twenty years
Broadband wireless communications, electronics and sensor networks technologies have evolved dramatically in the past twenty years
The numerical simulation results are presented to illustrate the reception performance of time hopping pulse position modulation impulse-based ultra-wide band wireless sensors and the performance enhancement provided by the complex-coefficient adaptive notch filter narrow band interference suppression algorithm developed in this paper under different channel propagation environments
Summary
Electronics and sensor networks technologies have evolved dramatically in the past twenty years. Either the UWB wireless sensors network designer needs to consider how to avoid the transmission of the UWB wireless signal over the frequencies of strong narrow band interferences or the UWB receivers need to utilize narrow band interference suppression techniques to elevate the reception performance, the transmitted range, the system capacity and the data rate of the UWB radio devices. The idea of the frequency notched antenna is not practical enough at avoiding a number of strong in-band narrow band interferences in the same UWB wireless sensor networks. Utilizing traditional fixed analog filters in the frequency domain will no doubt increase the computation complexity, size, power consumption and cost of the ultra-wide band wireless sensor networks. We present a novel complex-coefficient in-band adaptive NBI-avoiding scheme for time hopping coding division impulse ultra-wide band wireless sensor networks.
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