MIMO-OFDM/OQAM系统中基于导频的时域信道估计方法
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摘要
针对基于交错正交幅度调制的多输入多输出正交频分复用(multiple input multiple output orthogonal frequency division multiplexing with offset quadrature amplitude modulation,MIMO-OFDM/OQAM)系统的信道估计问题,构造了基于导频的时域信道估计模型,利用导频符号估计信道的时域脉冲响应。与传统的频域信道估计方法相比,这种方法需要的导频数量较少,并且在存在严重频率选择性衰落的信道条件下也有较好的估计性能,理论分析和仿真结果表明了算法的有效性。
The problem of channel estimation in multiple input multiple output orthogonal frequency division multiplexing with offset quadrature amplitude modulation(MIMO-OFDM/OQAM)systems is considered.The general preamble-based time domain channel estimation model is proposed and the frequency domain pilots are used to estimate the time domain channel impulse responses.Different from the conventional methods,this method needs fewer pilots overhead and has better estimation performance for highly frequency selective channels.Theoretical analyses and simulation results show the effectiveness of the proposed method.
The problem of channel estimation in multiple input multiple output orthogonal frequency division multiplexing with offset quadrature amplitude modulation(MIMO-OFDM/OQAM)systems is considered.The general preamble-based time domain channel estimation model is proposed and the frequency domain pilots are used to estimate the time domain channel impulse responses.Different from the conventional methods,this method needs fewer pilots overhead and has better estimation performance for highly frequency selective channels.Theoretical analyses and simulation results show the effectiveness of the proposed method.
引文
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[2]FARHANG-BOROUJENY B.OFDM versus filter bank multicarrier[J].IEEE Signal Processing Magazine,2011,28(3):92-112.
[3]赵宇,陈西宏,薛伦生.OFDM/OQAM系统中基于BEM信道模型的盲载波频偏估计算法[J].系统工程与电子技术,2016,38(6):1435-1439.ZHAO Y,CHEN X H,XUE L S.Blind carrier frequency offset estimation for OFDM/OQAM systems based on BEM[J].Systems Engineering and Electronics,2016,38(6):1435-1439.
[4]PEREZ-NEIRA A I,MARIUS C,ROSTOM Z,et al.MIMO signal processing in offset-QAM based filter bank multicarrier systems[J].IEEE Trans.on Signal Processing,2016,64(21):5733-5762.
[5]FUHRWERK M,MOGHADDAMNIA S,PEISSIG J.Scattered pilot-based channel estimation for channel adaptive FBMCOQAM systems[J].IEEE Trans.on Wireless Communications,2017,16(3):1687-1702.
[6]CUI W,QU D,JIANG T.Coded auxiliary pilots for channel estimation in FBMC-OQAM systems[J].IEEE Trans.on Vehicular Technology,2016,65(5):2936-2946.
[7]程国兵,肖丽霞,肖悦,等.一种改进的OFDM/OQAM系统信道估计算法[J].电子与信息学报,2012,34(2):427-432.CHENG G B,XIAO L X,XIAO Y,et al.An improved channel estimation algorithm for OFDM/OQAM systems[J].Journal of Electronics&Information Technology,2012,34(2):427-432.
[8]KOFIDIS E,KATSELIS D.Preamble-based channel estimation in MIMO-OFDM/OQAM systems[C]∥Proc.of the IEEE International Conference on Signal and Image Processing Applications,2011:579-584.
[9]KOFIDIS E,KATSELIS D,RONTOGIANNIS A,et al.Preamble based channel estimation in OFDM/OQAM systems:a review[J].Signal Processing,2013,93(7):2038-2054.
[10]SOHAIL T,GHORAISHI M,XIAO P,et al.Evaluation of preamble based channel estimation for MIMO-FBMC systems[J].ZTE Communications,2016,14(4):1-8.
[11]KOFIDIS E.Channel estimation in filter bank-based multicarrier systems:challenges and solutions[C]∥Proc.of the 6th IEEE International Symposium on Communications,Control and Signal Processing,2014:453-456.
[12]KONG D,QU D,JIANG T.Time domain channel estimation for OQAM-OFDM systems:algorithms and performance bounds[J].IEEE Trans.on Signal Processing,2014,62(2):322-330.
[13]KATSELIS D.On preamble-based channel estimation in OFDM/OQAM systems[C]∥Proc.of the European Signal Processing Conference,2011:1-5.
[14]KATSELIS D,KOFIDIS E,Rontogiannis A.Preamble-based channel estimation for CP-OFDM and OFDM/OQAM systems:a comparative study[J].IEEE Trans.on Signal Processing,2010,58(5):2911-2916.
[15]SAHIN A,GUVENC I,ARSLAN H.A survey on multicarrier communications:prototype filters,lattice structures,and implementation aspects[J].IEEE Communications Surveys Tutorials,2014,16(3):1312-1338.