Multiuser carrier frequency offset estimation for WiMAX periodic ranging based on OFDMA by FAN Da1, CAO Zhi-gang1, I Chihlin2

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Carrier frequency offset and time synchronization estimation based on new autocorrelation over fading channel by WANG Yong, LIAO Gui-sheng, WANG Xi-yuan

Subjects: “…frequency offset estimation;synchronization;correlation;sampling…”
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Joint estimation of interference frequency offset and time delay in PCMA system by Xue-juan WEI, Yong YANG, Yi-ming GUO, Dong-ling ZHANG

“…For cooperative received high-order modulation PCMA (paired carrier multiple access) signals,joint estima-tion of frequency offset and time delay was proposed.The sequence samples stored locally were used as auxiliary data.Estimation of frequency offset and time delay was calculated by optimizing the objective function,which was obtained from the cross-correlation computation of the auxiliary data and mixed signal,and the optimized process was accom-plished by utilizing two-dimensional search.By setting the threshold of joint estimation,the calculated amount was greatly reduced.Modified Cramer-Rao bound (MCRB) of interference frequency offset and time delay was derived,which provided theoretical basis for performance of the proposed algorithm.Simulation results show that the algorithm has similar performance with existing algorithms,but its complexity is reduced by two-thirds.…”
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Joint estimation of interference frequency offset and time delay in PCMA system by Xue-juan WEI, Yong YANG, Yi-ming GUO, Dong-ling ZHANG

“…For cooperative received high-order modulation PCMA (paired carrier multiple access) signals,joint estima-tion of frequency offset and time delay was proposed.The sequence samples stored locally were used as auxiliary data.Estimation of frequency offset and time delay was calculated by optimizing the objective function,which was obtained from the cross-correlation computation of the auxiliary data and mixed signal,and the optimized process was accom-plished by utilizing two-dimensional search.By setting the threshold of joint estimation,the calculated amount was greatly reduced.Modified Cramer-Rao bound (MCRB) of interference frequency offset and time delay was derived,which provided theoretical basis for performance of the proposed algorithm.Simulation results show that the algorithm has similar performance with existing algorithms,but its complexity is reduced by two-thirds.…”
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Low-complexity and frequency-offset-robust synchronization algorithm based on CAZAC sequence by Fengkui GONG, Ni WEN, Guo LI, Yang GAO

“…A low-complexity and frequency-offset-robust synchronization algorithm based on CAZAC sequence was proposed, which was suitable for burst OFDM systems.A new preamble sequence was constructed based on the CAZAC sequence, and its simplified timing metric function was derived by using the combination characteristics of the sequence, and then the delay correlation and symmetric correlation characteristics were used to achieve accurate and stable timing synchronization.Furthermore, based on the new constructed preamble sequence, a weighted frequency synchronization scheme combining cyclic prefix was proposed to obtain more accurate frequency offset estimation.Simulation results show that the proposed algorithm has good synchronization performance in both Gaussian channels and multipath fading channels regardless of frequency offset, and its computational complexity is lower than the most existing representative algorithms.…”
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Carrier frequency offsets estimation for distributed MIMO system based on SOMP method by Yanyan HUANG, Hua PENG

“…By utilizing the half invariant property of high-order cyclic cumulants,the equation of signals and its high-order cyclic cumulants was rederivated first.Then simultaneous orthogonal matching pursuit (SOMP) method was used to jointly reconstruct multiple receiving signals’ high-order cyclic cumulants.At last,according to the fourfold relationship between carrier frequency offsets and cyclic frequencies of main non-zeros high-order cyclic cumulants,multiple transmitting signals’ carrier frequency offsets were obtained.Comparing with existing algorithms,the correlation between receiving signals is fully used by the proposed algorithm,the carrier frequency offset estimation performance at low signal to noise is improved and the pilots numbers are reduced.…”
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Carrier frequency offsets estimation for distributed MIMO system based on SOMP method by Yanyan HUANG, Hua PENG

“…By utilizing the half invariant property of high-order cyclic cumulants,the equation of signals and its high-order cyclic cumulants was rederivated first.Then simultaneous orthogonal matching pursuit (SOMP) method was used to jointly reconstruct multiple receiving signals’ high-order cyclic cumulants.At last,according to the fourfold relationship between carrier frequency offsets and cyclic frequencies of main non-zeros high-order cyclic cumulants,multiple transmitting signals’ carrier frequency offsets were obtained.Comparing with existing algorithms,the correlation between receiving signals is fully used by the proposed algorithm,the carrier frequency offset estimation performance at low signal to noise is improved and the pilots numbers are reduced.…”
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Pseudo code estimation of LSC-DS-CDMA signal with residual frequency offset by Pan Weiyu, Zhao Zhijin

“…Aiming at the problem of estimation of long and short code direct spread code division multiple access signal with residual frequency offset, firstly, the signal matrix is constructed by using the periodic piecewise received signals of short code and long code. …”
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Advancing In Vivo Molecular Bioimaging With Optimal Frequency Offset Selection and Deep Learning Reconstruction for CEST MRI by Adarsha Bhattarai, Chathumi Samaraweera, Mariano Uberti, Aditya N. Bade, Yutong Liu, Dongming Peng

“…However, CEST MRI data acquisition requires prolonged scanning times, as data need to be collected at multiple frequency offsets to capture necessary information for accurate analysis of biological compounds. …”
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Design of Balanced Wide Gap No-Hit Zone Sequences with Optimal Auto-Correlation by Duehee Lee, Seho Lee, Jin-Ho Chung

“…Third, a no-hit zone (NHZ) window with a zero pairwise Hamming correlation eliminates user collisions and self-interference when chip-level timing offsets fall inside the window. …”
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Pilot Position Optimization Design of WLAN System Based on Experiment by Jue Lan, Yunzhou Li, Xin Su, Shidong Zhou

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Ultra-Short Baseline Synthetic Aperture Passive Positioning Based on Interferometer Assistance by Gaogao Liu, Qidong Zhang, Jian Xu, Jiangbo Zhu, Ziyu Huang, Beibei Mu, Hongfu Guo

“…However, there are still key technical issues regarding SAPP methods, such as residual frequency offset (RFO) coupling at Doppler frequency leading to decreased positioning accuracy, and non-periodic discontinuous signals emitted by unknown radiation sources (NRSs) causing positioning algorithm failure. …”
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Optimal Constructions of Low-Hit Zone Frequency-Hopping Sequence Set Based on <i>m</i>-Sequence by Changyuan Wang, Yi Zhang, Wanan Yang, Chunhua Ren

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A cross-correlator-based timing tool for FemtoMAX by D. Kroon, E. Nilsson, B. Ahn, M. Bertelli, R. Calarco, I. Clementsson, S. De Simone, J. C. Ekström, A. Jurgilaitis, M. Longo, V. T. Pham, J. Larsson

“…The method is based on sum-frequency generation in a nonlinear crystal. The setup is similar to an auto/cross-correlator setup. …”
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Experimental Test of Continuous Wave Frequency Diverse Array Doppler Radar by Nicholas R. Munson, Bill Correll, Ram M. Narayanan, Travis D. Bufler

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An Error Analysis Method for Correlation-Based Parameter Estimators in Discrete-Time Signals Under Gaussian Noise by Chris Hall, Ivan Djordjevic

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Research on Anti-Single-Frequency Interference Ability of Underwater Acoustic DSSS Communication System with Short-Period PN Sequences by Xiaowei Wang, Yong Wei, Qi Ma

“…In all working conditions where the interference frequency offset is an integer multiple of the bit bandwidth, single-frequency interference with a frequency offset equivalent to the bit bandwidth has the greatest impact on the system. …”
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Microgrid Frequency Regulation Based on Precise Matching Between Power Commands and Load Consumption Using Shallow Neural Networks by Zhen Liu, Yinghao Shan

“…Islanded microgrids commonly use droop control methods for autonomous power distribution; however, this approach causes system frequency deviation when common loads change. This deviation can be eliminated using secondary control methods, but the core of this approach is to generate compensation values equal to the offset amount to add to the controller, thereby eliminating deviations from rated values. …”
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Correlation Analysis of Refractive and Visual Quality after Wavefront-Optimized Laser In Situ Keratomileusis for 50% and 100% Angle Kappa Compensation by Xin-Yu Ru, Zheng-Ri Li, Cheng-Lin Li, Hong Cui, Wen-Qing Deng, Shu-Hua Lin, Yu-Jie Jia, Ying-Jun Li

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Characterisation and synchronisation of a netted software defined radio radar by Ferran Valdes Crespi, Angel Slavov, Matthias Weiß, Peter Knott, Daniel O’Hagan

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