一种改进的OFDM/OQAM信道估计方法
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摘要
针对OFDM/OQAM系统中格状导频信道估计,辅助导频信道估计方法辅助导频能量消耗大的问题,提出了一种改进的辅助导频信道估计方法。通过改变导频结构的布置,减少辅助导频消除干扰的时频格点数目,对其余时频格点的干扰通过置零法进行消除,从而降低了辅助导频法中辅助导频的能量消耗。仿真结果表明,改进方法保证了信道估计的性能,与现有的辅助导频方法相比,提升了信道估计的精度,同时有效降低了系统辅助导频的能量消耗。
The auxiliary pilot channel estimation method for OFDM/OQAM system has lower power efficiency. In view of this problem,this paper proposes an improved Auxiliary Pilot( AP) channel estimation method.In this method,the pilot structure is changed to reduce the number of time frequency points whose interference is eliminated by the auxiliary pilot and set to zero for other time frequency point that adjacent to the pilot,thereby reducing the energy consumption of auxiliary pilot.The simulation results show that the proposed method can maintain a better channel estimation performance,improve the accuracy of channel design,and have higher power efficiency,compared with existing auxiliary pilot method.
The auxiliary pilot channel estimation method for OFDM/OQAM system has lower power efficiency. In view of this problem,this paper proposes an improved Auxiliary Pilot( AP) channel estimation method.In this method,the pilot structure is changed to reduce the number of time frequency points whose interference is eliminated by the auxiliary pilot and set to zero for other time frequency point that adjacent to the pilot,thereby reducing the energy consumption of auxiliary pilot.The simulation results show that the proposed method can maintain a better channel estimation performance,improve the accuracy of channel design,and have higher power efficiency,compared with existing auxiliary pilot method.
引文
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[17] CHOI J M,OH Y,LEE H,et al.Pilot-Aided Channel Estimation Utilizing Intrinsic Interference for FBMC/OQAM Systems[J].IEEE Trans.on Broadcasting,2017,99:1-12.
[18] PENTHERL,JAVAUDIN J-P.A New Channel Estimation Method for OFDM/OQAM[C]∥Proccedings of the 7th International OFDM Workshop,2002:1-6.
[19] MOGOLB,YAMAZATO T,OKADA H,et al.Channel Stimation for BFDM/OQAM System in Dispersive Time-varying Channels[C]∥In Proc.ISWCS’06,2006:159-163.
[20] HE X,ZHAO Z,ZHANG H.A Pilot-aided Channel Estimation Method for FBMC/OQAM Communications System[C]∥International Symposium on Communications and Information Technologies,2012:175-180.
[21]梁燕,秦梦瑶,张贺伟.FBMC/OQAM系统导频辅助信道估计方法概述[J].重庆邮电大学学报,2015,27(4):477-483.
[22]蔡自伟.OFDM/OQAM系统的信道估计和信道编码技术研究[D].重庆:重庆大学,2014.
[2] BLCSKEI H. Orthogonal Frequency Division Multiplexing Based on Offset QAM[M]. Advances in Gabor Analysis.Boston:Birkhuser,2003:321-352.
[3] SIOHANP,SICLET C,LACAILLE N.Analysis and Design of OFDM/OQAM Systems Based on Filterbank Theory[J].IEEE Trans.on Signal Processing,2002,50(5):1170-1183.
[4] NDO G,SIOHAN P,HAMON M.A Comparison between Coded OFDM/OQAM and CP-OFDM Modulations over Multipath Channels[C]∥Proc. of the Vehicular Technology Conference Fall,IEEE Press,2010:1-5.
[5] VUKOTI S,VU I D.Detection and Classification of OFDM/QAM and OFDM/OQAM Signals Based on Cyclostationary Features[C]∥Proc. of the Telecommunications Forum Telfor,IEEE Press,2016:232-235.
[6] AMINJAVAHERI A,FARHANG A,REZAZADEHREYHANI A,et al.Impact of Timing and Frequency Offsets on Multicarrier Waveform Candidates for 5G[C]∥Proc. of the Signal Processing and Signal Processing Education Workshop,IEEE Press,2015:178-183.
[7] ZHAO Y,CHEN X,XUE L,et al.Iterative Preamble-Based Time Domain Channel Estimation for OFDM/OQAM Systems[J]. The Institute of Electronics,Information and Communication Engineers.2016,E99B(10):2221-2227.
[8] JAVAUDIN J P,LACROIX D,ROUXEL A. Pilot-aided Channel Estimation for OFDM/OQAM[C]∥Proc.of the Vehicular Technology Conference,IEEE Press,2003:1581-1585.
[9] LACROIX D,JAVAUDIN J P.A New Channel Estimation Method for OFDM/OQAM[C]∥Proc. of the 7th International OFDM Workshop,2002:1-6.
[10] LELE C,LEGOUABLE R,SIOHAN P.Channel Estimation with Scattered Pilots in OFDM/OQAM[J]. Signal Processing Advances in Wireless Communications,IEEE Press,2008:286-290.
[11] LLC. Iterative Scattered-Based Channel Estimation Method for OFDM/OQAM[J]. EURASIP Journal on Advances in Signal Processing,2012,2012(1):1-14.
[12] ZHAO Z,VUCIC N,SCHELLMANN M.A Simplified Scattered Pilot for FBMC/OQAM in Highly Frequency Selective Channels[C]∥Proc.of the International Symposium on Wireless Communications Systems,IEEE Press,2014:819-823.
[13] CARO L,SAVAUX V,BOITEAU D,et al.Preamble-Based LMMSE Channel Estimation in OFDM/OQAM Modulation[C]∥Proc. of the Vehicular Technology Conference,IEEE Press,2015:1-5.
[14] CHEN X,ZHAO M,XU C.Preamble-based Channel Estimation Methods with high Spectral Efficiency for Pulse Shaping OFDM/OQAM Systems[C]∥Proc. of the Sixth International Conference on Wireless Communications and Signal Processing,IEEE Press,2014:1-6.
[15] KOFIDIS E,KATSELIS D.Improved Interference Approximation Method for Preamble-Based Channel Estimation in FBMC/OQAM[C]∥Proc. of the Signal Processing Conference,European,IEEE Press,2015:1603-1607.
[16] 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.
[17] CHOI J M,OH Y,LEE H,et al.Pilot-Aided Channel Estimation Utilizing Intrinsic Interference for FBMC/OQAM Systems[J].IEEE Trans.on Broadcasting,2017,99:1-12.
[18] PENTHERL,JAVAUDIN J-P.A New Channel Estimation Method for OFDM/OQAM[C]∥Proccedings of the 7th International OFDM Workshop,2002:1-6.
[19] MOGOLB,YAMAZATO T,OKADA H,et al.Channel Stimation for BFDM/OQAM System in Dispersive Time-varying Channels[C]∥In Proc.ISWCS’06,2006:159-163.
[20] HE X,ZHAO Z,ZHANG H.A Pilot-aided Channel Estimation Method for FBMC/OQAM Communications System[C]∥International Symposium on Communications and Information Technologies,2012:175-180.
[21]梁燕,秦梦瑶,张贺伟.FBMC/OQAM系统导频辅助信道估计方法概述[J].重庆邮电大学学报,2015,27(4):477-483.
[22]蔡自伟.OFDM/OQAM系统的信道估计和信道编码技术研究[D].重庆:重庆大学,2014.