A Waveform Design Method of Cognitive Ultra Wide Band Communications Based on Optimized Combination Wavelet
ZHAO Yan-ming
CHEN Chang-xing
NIU De-zhi
FU Hui
Abstract：Pulse waveform design problems of cognitive ultra wide band (CUWB)are studied,and a method of optimized combination Morlet wavelet is proposed.On the basis of characteristic analysis in time and frequency domain of Morlet,the design steps of the method are worked out.Firstly,the value area of wavelet stretching factor is acquired by the use of dichotomy method under the action of power spectrum density (PSD)met the needs of FCC spectral mask.Then,optimized weight is searched by designing pro-grammable logistic language so as to get combined UWB pulse with high frequency spectrum efficiency.In consideration of authorized frequency band detected by cognitive user,band-stop filter is designed for sup-pressing narrow band interference,thus CUWB pulse waveform is got by making UWB pulse pass the de-signed filter.The simulation shows that the proposed method is susceptible to realization and operation, the designed waveform has good autocorrelation character and high spectrum utilization ratio,which pro-vides a new thought for waveform design of CUWB.
Keywords：cognitive ultra wide band (CUWB)waveform designoptimized combinationband-stop filter
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 77-81 )