Interference Reduction Study For Impulse UWB System Based On Multi-carrier Template

As an emerging wireless communication technology, the Ultra Wild-band takes the advantages of higher data rate, higher band, lower power, lower expense and anti- multi-path influence of. Now it has been the best solution of high data transmission for middle or short-distance. However, it has to reuse the spectrum of other communication systems due to its great frequency occupancies, which brings a large challenge to the research of anti-interference, compatibility and so on.This dissertation focuses on anti-interference technology of UWB system based on impulse radio. For the interference from narrowband system whose frequency band is certain, we propose a modified receiving template waveform method (MRTW), an ordinary UWB transmission pulse is approximated with a multi-carrier type waveforms, which is used for substituting the traditional template waveform in receiver. When there are interference signals, the new template waveform is modified in order to suppress any correlation from the interfering signal at the correlator output of the receiver and reduce the interference performance. Then we propose an adaptive modified receiving template waveform method (AMRTW) for the situation that the spectrum of narrowband interference is stochastic. This method adds the interference detector, adaptive frequency estimator and adaptive receiving template waveform decomposer to the MRTW method, the receiving template waveform can be adaptively decomposed and modified to mitigate the effect of stochastic and various interference signals. The theoretic analytic and simulation results show that the effect of interference from other radio system can be mitigated and the performance of communication can be improved.