基于散射信道的OFDM/OQAM信道估计方法
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摘要
针对散射信道下OFDM/OQAM系统的信道估计问题,将散射信道建模为瑞利衰落信道,对预编码信道估计方法进行了分析,并且提出了一种改进的预编码信道估计方法。该方法通过改变导频结构的布置,减小预编码矩阵的维数,对未编码符号的干扰通过置零法进行消除,从而降低了预编码信道估计方法的计算复杂度。仿真结果表明,改进方法保证了信道估计的性能,与现有的预编码方法相比,改进方法显著降低了计算复杂度,同时不会产生额外的导频功率消耗。
The Precoding scatter pilot channel estimation method for OFDM/OQAM system based on troposcatter channel has a high computation complexity,for this problem,an improved Precoding channel estimation method is proposed. This method reduces complexity by change the structure of the pilot,reduce the code number of the codding matrix and set to zero in the other uncoded adjacent symbols in the pilot,thereby reduced the computation complexity efficiently. The simulation results show that the proposed method has a lower complexity than Precoding method,with no extra pilot power consumption and similar channel estimation performance.
The Precoding scatter pilot channel estimation method for OFDM/OQAM system based on troposcatter channel has a high computation complexity,for this problem,an improved Precoding channel estimation method is proposed. This method reduces complexity by change the structure of the pilot,reduce the code number of the codding matrix and set to zero in the other uncoded adjacent symbols in the pilot,thereby reduced the computation complexity efficiently. The simulation results show that the proposed method has a lower complexity than Precoding method,with no extra pilot power consumption and similar channel estimation performance.
引文
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[14]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.
[15]孙希东.OFDM/OQAM系统在瑞利信道下的信道估计与均衡方法[J].自动化技术与应用,2016,35(3):36-41.
[2]PENTHER L,JAVAUDIN J P. A new channel estimationmethod for OFDM/OQAM[C]//Proccedings of the 7th Inter-national OFDM Workshop,2002.
[3]MOGOL B,YAMAZATO T,OKADA H,et al.Channel stima-tion for BFDM/OQAM system in dispersive time-varyingchannels[C]//In Proc. ISWCS’06,2006:159-163.
[4] JAVAUDIN J P,LACROIX D,ROUXEL A. Pilot-aidedchannel estimation for OFDM/OQAM[C]//Proccedings ofthe 57th IEEE Semiannual Vehicular Technology Confer-ence,Jeju,South Korea,2003.
[5]刘圣明,熊兆飞.对流层散射技术[M].北京:国防工业出版社,1982.
[6]HE X,ZHAO Z,ZHANG H. A pilot-aided channel estima-tion method for FBMC/OQAM communications system[C]//International Symposium on Communications and InformationTechnologies,2012.
[7] LELE C,SIOHAN P,LEGOUABLE R. Preamble-basedchannel estimation techniques for OFDM OQAM over thepowerline[C]//IEEE International Symposium on PowerLine Communications and Its Applications,Pisa,Italy,2007.
[8]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.
[9]吴奔,陈西宏,刘晓鹏,等.散射通信中OFDM/OQAM的I-CI和ISI分析[J].火力与指挥控制,2015,40(9):35-39.
[10]DU J F,SIGNELL S.Novel preamble-based chan-nel esti-mation for OFDM/OQAM systems[C]//Pr-oceedings ofIEEE ICC,2009:1-6.
[11]LELE C,JACAUDIN J P,LEGOUABLE R. Channel esti-mation methods for preamble-based OFDM/OQAM modu-lations[C]//European Wireless Conference,Paris,France,2007.
[12]YOON T,IMS,HWANG S. Pilot structure for high data ratein OFDM/OQAM-IOTA system[C]//IEEE 68th VehicularTechnology Conference,2008.
[13]KOFIDIS E,KATSELIS D,RONTOGIANNIS A. Pream-ble-based channel estimation in OFDM/OQAM systems:Areview[J]. Signal Processing,2013(93):2038-2054.
[14]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.
[15]孙希东.OFDM/OQAM系统在瑞利信道下的信道估计与均衡方法[J].自动化技术与应用,2016,35(3):36-41.