卫星多载波混合信号的时延估计算法
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摘要
针对卫星通信中时频重叠的多载波信号,提出了一种基于循环自相关函数的时延估计算法。该算法分别分析了信道衰减、滤波器等信号参数已知和未知两种情况对应的算法理论和实现步骤,并分别阐述了载噪比大小、符号长度、频率精度、幅度精度以及频率间隔等参数对该算法的影响,同时给出了多载波混合信号时延估计的理论界。分析和仿真结果表明,该算法具有有效性。
For the time-frequency overlapping multi-carrier signal in satellite communication, a novel timedelay estimation algorithm based on cyclic autocorrelation function is proposed. The algorithm analyzes the corresponding theoretical foundation and implementation steps in the cases that the channel gains and parameters of filter are known or not. And this paper describes the influence of parameters such as carrier-to-noise ratio, symbol length, frequency accuracy, amplitude accuracy and frequency interval on the algorithm, and gives the theoretical bound of multi-carrier mixed-signal delay estimation. Analysis and simulation results indicate that this proposed algorithm is feasible and effective.
For the time-frequency overlapping multi-carrier signal in satellite communication, a novel timedelay estimation algorithm based on cyclic autocorrelation function is proposed. The algorithm analyzes the corresponding theoretical foundation and implementation steps in the cases that the channel gains and parameters of filter are known or not. And this paper describes the influence of parameters such as carrier-to-noise ratio, symbol length, frequency accuracy, amplitude accuracy and frequency interval on the algorithm, and gives the theoretical bound of multi-carrier mixed-signal delay estimation. Analysis and simulation results indicate that this proposed algorithm is feasible and effective.
引文
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[11]万坚,涂世龙,廖灿辉等.通信混合信号盲分离理论与技术[M].北京:国防工业出版社,2012.WAN Jian,TU Shi-long,LIAO Can-hui,et al.Theory and Technology on Blind Source Separation of Communication Signals[M].Beijing:National Defense Industry Press,2012.
[2]朱巍,梁俊,肖楠等.基于物理层网络编码的卫星时隙ALOHA策略[J].计算机应用与软件,201532(11):134-138.ZHU Wei,LIANG Jun,XIAO Nan,et al.Slotted ALOHA Strategy for Satellite Based on Physical Layer Network Coding[J].Computer Applications and Software,2015,32(11):134-138.
[3]Ding W B,Yang F,Liu S C,et al.Non-orthogonal TimeFrequency Training-Sequence-Based CSI Acquisition for MIMO Systems[J].IEEE Transactions on Vehicular Te chnology,2016,65(32):5714-5719.
[4]Vukotim S,Vui D.Detection and Clasiffication of OFDM/QAM and OFDM/OQAM Signals Based on Cyclostationary Features[C].Proc.of Tele Communications Forum Telfor.,2015:232-235.
[5]Regev N,Iofedov I,Wulich D.Maximum Likelihood Detection of Nonlinearly Distorted OFDM Signal[C].Proc.of Global Communication Conference,2015:1-6.
[6]郭一鸣,杨勇,张冬玲等.单通道同频混合信号时延高效估计方法[J].系统工程与电子技术,2014,36(07):1416-1421.GUO Yi-ming,YANG Yong,ZHANG Dong-ling,et al.Efficient Time Delay Estimation Algorithm for Singlechannel Co-frequency Signals[J].Systems Engineering and Electronics,2014,36(07):1416-1421.
[7]曲阜平,熊涛,江桦等.基于信赖域法的同频混合QPSK信号时延估计算法[J].信息工程大学学报,2015,16(06):685-688.QU Fu-ping,XIONG Tao,JIANG Hua,et al.Maximum Likelihood Time Delay Estimation of Mixed QPSKSignals with Same Frequency Based on Trust Region Algorithm[J].Journal of Information Engineering University,2015,16(06):685-688.
[8]涂世龙,郑辉.单通道同频线性调制混合信号的时延估计[J].数据采集与处理,2010,25(04):449-453.TU Shi-long,ZHENG Hui.Time Delay Estimation of Co-frequency Linear Modulated Signals Using Singlechannel Mixture[J].Journal of Data Acquisition&Processing,2010,25(04):449-453.
[9]芮国胜,徐彬,张嵩.GMSK混合信号时延的并行估计算法[J].通信学报,2011,32(06):32-37.RUI Guo-sheng,XU Bin,ZHANG Song.Parallel Timedelay Estimation Algorithm for GM SK Mixing Signals[J].Journal on Commnunications,2011,32(06):32-37.
[10]Xiao B L,Yong L G,Soo N K.Single-channel Blind Separation of Co-frequency MPSK Signals Based on PSP Algorithm with DFSE[C].Proc.of Military Communications Conference,2016:1509-1514.
[11]万坚,涂世龙,廖灿辉等.通信混合信号盲分离理论与技术[M].北京:国防工业出版社,2012.WAN Jian,TU Shi-long,LIAO Can-hui,et al.Theory and Technology on Blind Source Separation of Communication Signals[M].Beijing:National Defense Industry Press,2012.