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carrier frequency and symbol rate estimation based on cyclic spectrum

Journal of Systems Engineering and Electronics 2020年第1期31卷 37-44页

作者： CAO Sisi ZHANG Weiyan Institute of Computer Applications China Academy of Engineering Physics

carrier frequency and symbol rate estimation are the main contents of parameter estimation,which is the basis of modulation recognition and further processing of signals especially in non-cooperative *** the development of wireless communication,the signal transmission environment has become increasingly bad,causing more difficulties in parameter *** is well known that the signal cycle spectrum is robust to noises and signal parameters are closely *** practice,it is impossible to calculate the cyclic spectrum of infinite length data *** using finite length data to obtain a cycle spectrum,the truncation noise is induced,resulting in *** is necessary to overcome the influence of noises in order to improve the detection ability of discrete spectral *** improved method of the discrete spectral line extraction algorithm is proposed by reflecting the amplitude advantage of discrete spectral lines through salient features of continuous noises in discrete spectral line neighborhood.

关键词： digital modulation signal carrier frequency symbol rate cyclic spectrum noise control

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Performance of a novel carrier frequency offset estimation algorithm for OFDM-based WLANs

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第3期7卷 321-325页

作者：赵忠伟 Institute of Wireless Communication and Network Department of Information and Electronic Engineering Zhejiang Gongshang University Hangzhou 310035 China

This paper presents a novel carrier frequency offset estimation (CFO) algorithm for orthogonal frequency division multiplexing (OFDM)-based Wireless Local Area Networks (WLANs). Compared with previous approaches, this paper extends the whole frequency offset acquisition range by embedding a synthetic algorithm according to the preamble structure of WLANs symbols. The numerical results presented support the effectiveness of this algorithm by which the estimation error of the whole carrier frequency offset in the WLANs is effectively decreased.

关键词： carrier frequency OFDM WLANs Preamble structure Acquisition

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Online Measurements of High-band Grid Impedance Using Variable frequency carrier Based PWM Schemes

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CSEE Journal of Power and Energy Systems 2021年第1期7卷 128-139页

作者： Zheyu Miao Hao Tong Wenxi Yao Zhengyu Lu the College of Electrical Engineering Zhejiang UniversityHangzhou 310027China

Grid-connected power electronic devices, such asvoltage-source inverters (VSIs), are increasingly installed in thegrid for the utilization of renewable energy sources. Under highpenetration, the weak grid contains plentiful harmonics and complexgrid impedance values, which have deep impacts on systemstability as well as its control performance. Online impedancemeasurement is needed for impedance based adaptive controland analysis. This paper proposes a variable carrier frequencyPWM (VCFPWM) based online grid impedance measurementtechnology. This method broadens the available working rangein the high frequency band without increasing the low bandperturbations. Through good analysis and design of the carrierfrequency, the VCFPWM method injects sufficient harmonicenergy at specified high frequency points and guarantees lowTHDs at the same time. The detailed design considerations ofthe carrier frequency are clarified and the characteristics of theVCFPWM based excitations are analyzed in this paper. Finally,the simulation and experimental results based on a three-phasegrid-connected VSI are presented to verify the effectiveness ofthe proposed method.

关键词： carrier frequency harmonic impedance measurement voltage-source inverters weak grid

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