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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 & zou weixia key lab of universal wireless communications,moe.wireless network lab,beijing university of posts and telecommunications,beijing 100876,china key lab of universal wireless communications MOE. Wireless Network Lab Beijing University of Posts and Telecommunications Beijing 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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RPPK modulation with high data rates

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Science china(Information Sciences) 2010年第2期53卷 344-354页

作者： li bin , zhou zheng & zou weixia key laboratory of universal wireless communications, Ministry of Education wireless network laboratory, beijing university of posts and telecommunications, beijing 100876, china key laboratory of universal wireless communications Ministry of Education Beijing University of Posts and Telecommunications Beijing China wireless network laboratory Beijing University of Posts and Telecommunications Beijing China

With the development of communication technology, the precious frequency spectrum is becoming more and more crowded. Exploiting the particular filter with zero group delay, ultra narrow band (UNB) modulation is intended for acquiring the high frequency efficiency. Unfortunately, this UNB filter is confronted with great challenges from the classical communication theories. The validation on its realization is also difficult. This paper proposes a novel UNB modulation, namely random pulse position keying (RPPK). It is demonstrated from analysis that there is no inessential discrete spectral line in modulated signal’s power density spectrum (PDS), and the UNB filter has been successfully avoided. Consequently, RPPK is rather explicit in theory and simple in implementation. As is shown by the simulation, the frequency utilization of RPPK can even reach 100 bits/s/Hz. Its optimum receiving performance is slightly inferior to BPSK, yet is much superior to that of other UNB modulations such as VMSK/2. Moreover, multi-access and confidentiality are additional benefits to UNB users.

关键词： UNB modulation frequency utilization efficiency RPPK PDS

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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 zhou key lab of universal wireless communications moe.wireless network lab beijing university of posts and telecommunications beijing 100876 china

＜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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On Multi-Frequency Channel Interference Alignment of 3 Channels and 4 Users

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china communications 2016年第1期13卷 22-32页

作者： DU Guanglong zou weixia zhou zheng key lab of universal wireless communications MOEBeijing University of Posts and Telecommunications State key lab.of Millimeter Waves Southeast University

This paper explores the multi-frequency independent channel interference alignment(MFC-IA) system of 3 channels and4 users,and single data stream transmit,i.e.(3×3,1)~4 *** derive the analytic solution for(3×3,1)~4 MFC-IA *** on the analytic solution,an optimization problem is proposed aim at the optimal IA *** based on such a math model,we propose a simulated annealing(SA) algorithm to search optimal IA *** simulation results show that the simulated annealing IA algorithm has a better sum rate performance than iterative maximize signal to interference plus noise ratio(Max-SINR) *** result can be extended to single data stream multi-antenna IA system with 3 antennas and4 users.

关键词： communication and information system interference alignment multi-frequency channel analytic solution simulated annealing

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