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A novel adaptive spectrum forming filter:Application in cognitive ultra-wideband

Science china(Information Sciences) 2010年第12期53卷 2584-2599页

作者： li bin ,zhou zheng & {3. weixia key lab of universal Wireless communications,moe.Wireless network lab,beijing university of posts and telecommunications,{13.,china 1. key lab of universal Wireless {3. MOE. Wireless Network Lab Beijing University of Posts and Telecommunications Beijing 100876 China

Ultra wideband impulse radio(UWB-IR) has important applications in high data rate communications,high precision positioning and penetrating target *** with cognitive radio(CR),UWB can also greatly alleviate the current spectrum ***,the existing UWB waveforms are faced with two *** spectrum utilization of UWB signal is rather low,which reduces the communication ***,it appears difficult for UWB-IR to avoid spectrum collision with other incumbent *** UWB will inevitably interfere other legal wireless *** by these considerations,we model the UWB waveform design into an interpolation *** on radial basis function neural network,a novel UWB pulse is presented in this *** UWB pulse is then realized though reasonable simplification on the already proposed theoretical *** designed UWB pulses can adaptively track the external spectral environment where UWB devices work and reconfigure its emission spectrum according to the state of primer users without any modification on *** frequency utilization is maximized when there is no active primary *** adequate spectrum avoidance has also been achieved without much spectrum utilization degradation within the non-primary *** and analysis show that our UWB-IR pulse is much superior to the other existing UWB signals in the frequency utilization,spectrum avoidance and in the transmission performance.

关键词： UWB-IR cognitive radio pulse design RBF network spectrum efficiency spectrum avoidance

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THE RELATIONSHIPS AMONG DATA SYMBOLS SATISFIED FOR SIDELOBE SUPPRESSION IN MB-OFDM COGNITIVE RADIOS

THE RELATIONSHIPS AMONG DATA SYMBOLS SATISFIED FOR SIDELOBE ...

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2009 IEEE International Conference on Communication Technology and Applications（ICCTA2009）

作者： Zhigang Xu Cheng Yang weixia zou zheng {3. key lab of universal Wireless communications moe.Wireless network lab beijing university of posts and telecommunications beijing 100876 {13.

＜正＞From the mathematic expression,we can see that sidelobe power of multi-band orthogonal frequency-division multiplexing（MB-OFDM） signal is a function of the data symbols loaded on the *** the derivation of the minimum of the function,relationships among data symbols, which help to suppress sidelobes,are *** types of methods,referred as Sub-carrier Adding（SA） method and Sub-carrier Multiplying（SM） method, are proposed,which realize the relationships at the cost of small degradation in information transmission *** a result,with the proposed methods,the sidelobe power can be *** results also prove this.

关键词： OFDM sidelobe suppression data symbols relationships

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