The Experts below are selected from a list of 5409 Experts worldwide ranked by ideXlab platform

Hiroshi Harada - One of the best experts on this subject based on the ideXlab platform.

  • WCNC - Adaptive time-domain windowing based transmit power control for TVWS-WLAN systems
    2014 IEEE Wireless Communications and Networking Conference (WCNC), 2014
    Co-Authors: Keiichi Mizutani, Hiroshi Harada
    Abstract:

    Demand for wireless communication has increased significantly, on the other hand, the frequency band available for wireless communication is scarce. Use of wireless communication in the TV white spaces (TVWS) has been promoted in various countries, and primary user protection is mandatory. Particularly, very strict transmit Spectrum Mask is configured by FCC in USA. In order to effective use of TVWS, this paper proposes a transmit power control method based on adaptive time-domain windowing processing for orthogonal frequency division multiplexing (OFDM) based wireless communication systems operating in TVWS. The proposed transmit power control scheme provides the appropriate transmit Spectrum to meet the required transmit Spectrum Mask regulation and the maximum throughput under the given environment without any special processing at the receiver side. The proposed scheme will contribute to the realization of the wireless communication systems operating in the TVWS.

Qi Ben-sheng - One of the best experts on this subject based on the ideXlab platform.

  • Simulation and Analysis of Ultra-Wideband Signals Power Spectrum
    Computer Simulation, 2007
    Co-Authors: Qi Ben-sheng
    Abstract:

    UWB signals and their power Spectrum Mask are important factors which need to be considered when studying the Spectrum coexisting and compatible problems between UWB systems and other radio systems.In this paper,according to the characteristics of UWB signals,the influence of Gaussian pulse and its derivatives,different information modulation mechanisms and time-hopping parameters on the power Spectrum Mask of UWB signals is simulated and analyzed from the view of power restriction,and the methods for controlling the power Spectrum Mask are concluded.This study will provide some useful ideas and methods for settling Spectrum coexistence problems between UWB communication systems and other radio systems.

Gao Yuan - One of the best experts on this subject based on the ideXlab platform.

  • Power Spectrum Simulation Model of Ultra-Wideband Signals
    Computer Simulation, 2006
    Co-Authors: Gao Yuan
    Abstract:

    UWB signals and their power Spectrum Mask are important factors which need to be considered when studying the Spectrum coexisting and compatible problems between UWB systems and other radio systems.In this paper,the UWB signal generator is established based on the math expression of UWB signals by MATLAB,and is combined with the Simulink block to perform the real time simulation to the power spectral density of UWB signals.An efficient and convenient interface is provided for analyzing and studying the power spectral density of UWB signals.Then the power spectral densities of UWB signals with difference parameters are simulated by the simulation model,and the feasibility of the model is validated.

Qian Liu - One of the best experts on this subject based on the ideXlab platform.

  • Linear Combination Method for UWB Vehicular Radar Pulse Design
    2010 International Conference on Computational Intelligence and Software Engineering, 2010
    Co-Authors: Bin Xia, Hong Xie, Qian Liu, Nan Xie
    Abstract:

    Ultra wideband (UWB) vehicular radar has been studied and developed to achieve a safe driving and to promote business in an intelligent transport system. In the paper, we propose a UWB radar pulse design method that makes use of a linear multi-pulse combination of wavelet pulses which satisfy the Federal Communications Commission (FCC) regulation. Simulation results show that the UWB pulse obtained by the method have the advantages of better Spectrum utility ratio and complying with the FCC Spectrum Mask.

  • Pulse design method for UWB vehicular radar system
    2010 Second Pacific-Asia Conference on Circuits Communications and System, 2010
    Co-Authors: Bin Xia, Hong Xie, Gang Liu, Qian Liu
    Abstract:

    A frequency-domain pulse design method for ultra wideband (UWB) vehicular radar system is proposed. Morlet wavelet pulses with the diverse dilatation factors are randomly selected as basis ones. By adjusting these parameters such as the dilation and the value of the amplitude spectral, the corresponding power spectral density (PSD) of linear combination pulse is obtained which must match the FCC's PSD Mask as closely as possible and maximize the bandwidth. Then the combination coefficients are directly obtained by the solution of frequency-domain restraint equation group. Simulation results show that the PSD of combination pulse has larger bandwidth than that of single Morlet pulse and complies with the FCC Spectrum Mask.

Bin Xia - One of the best experts on this subject based on the ideXlab platform.

  • Linear Combination Method for UWB Vehicular Radar Pulse Design
    2010 International Conference on Computational Intelligence and Software Engineering, 2010
    Co-Authors: Bin Xia, Hong Xie, Qian Liu, Nan Xie
    Abstract:

    Ultra wideband (UWB) vehicular radar has been studied and developed to achieve a safe driving and to promote business in an intelligent transport system. In the paper, we propose a UWB radar pulse design method that makes use of a linear multi-pulse combination of wavelet pulses which satisfy the Federal Communications Commission (FCC) regulation. Simulation results show that the UWB pulse obtained by the method have the advantages of better Spectrum utility ratio and complying with the FCC Spectrum Mask.

  • Pulse design method for UWB vehicular radar system
    2010 Second Pacific-Asia Conference on Circuits Communications and System, 2010
    Co-Authors: Bin Xia, Hong Xie, Gang Liu, Qian Liu
    Abstract:

    A frequency-domain pulse design method for ultra wideband (UWB) vehicular radar system is proposed. Morlet wavelet pulses with the diverse dilatation factors are randomly selected as basis ones. By adjusting these parameters such as the dilation and the value of the amplitude spectral, the corresponding power spectral density (PSD) of linear combination pulse is obtained which must match the FCC's PSD Mask as closely as possible and maximize the bandwidth. Then the combination coefficients are directly obtained by the solution of frequency-domain restraint equation group. Simulation results show that the PSD of combination pulse has larger bandwidth than that of single Morlet pulse and complies with the FCC Spectrum Mask.