一種降低OFDM移動通信系統(tǒng)中LS信道估計均方誤差的算法

李國松; 周正歐

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一種降低OFDM移動通信系統(tǒng)中LS信道估計均方誤差的算法

李國松, 周正歐

文章導航 > 電子與信息學報 > 2005 > 27(9): 1454-1458

李國松, 周正歐. 一種降低OFDM移動通信系統(tǒng)中LS信道估計均方誤差的算法[J]. 電子與信息學報, 2005, 27(9): 1454-1458.

引用本文:

李國松, 周正歐. 一種降低OFDM移動通信系統(tǒng)中LS信道估計均方誤差的算法[J]. 電子與信息學報, 2005, 27(9): 1454-1458.

Li GuoSong, Zhou ZhengOu. An Algorithm to Reduce MSE of LS Channel Estimation in Mobile OFDM System[J]. Journal of Electronics & Information Technology, 2005, 27(9): 1454-1458.

Citation:

Li GuoSong, Zhou ZhengOu. An Algorithm to Reduce MSE of LS Channel Estimation in Mobile OFDM System[J]. Journal of Electronics & Information Technology, 2005, 27(9): 1454-1458.

李國松, 周正歐. 一種降低OFDM移動通信系統(tǒng)中LS信道估計均方誤差的算法[J]. 電子與信息學報, 2005, 27(9): 1454-1458.

引用本文:

李國松, 周正歐. 一種降低OFDM移動通信系統(tǒng)中LS信道估計均方誤差的算法[J]. 電子與信息學報, 2005, 27(9): 1454-1458.

Li GuoSong, Zhou ZhengOu. An Algorithm to Reduce MSE of LS Channel Estimation in Mobile OFDM System[J]. Journal of Electronics & Information Technology, 2005, 27(9): 1454-1458.

Citation:

Li GuoSong, Zhou ZhengOu. An Algorithm to Reduce MSE of LS Channel Estimation in Mobile OFDM System[J]. Journal of Electronics & Information Technology, 2005, 27(9): 1454-1458.

一種降低OFDM移動通信系統(tǒng)中LS信道估計均方誤差的算法

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出版歷程
- 收稿日期: 2004-04-12
- 修回日期: 2005-02-07
- 刊出日期: 2005-09-19

An Algorithm to Reduce MSE of LS Channel Estimation in Mobile OFDM System

摘要

摘要: 在基于OFDM的移動通信系統(tǒng)中,針對LS信道估計時域結果的構成特點,同時結合無線信道沖激響應在時域為有限持續(xù)長度的特性,提出一種新的算法估計信道有效階數(shù),然后利用該估計值對LS信道估計時域結果進行加窗處理以減小LS算法中由噪聲和子信道間干擾引起的均方誤差:LS算法性能的提高及其對系統(tǒng)誤符號性能的改善通過計算機仿真得以驗證.
- OFDM; 信道估計; 有效階數(shù); LS算法
Abstract: In mobile OFDM system, this paper pays much attention to the character of time domain result of LS channel estimation. At the same time, it is noticed that the character of Channel Impulse Response （CIR） is finite impulse response. A new algorithm is proposed to estimate channel effective order, and then the estimated value is used to truncate the time-domain result of channel estimation achieved by LS algorithm in order to reduce Mean Square Error （MSE） of LS algorithm due to noise and Inter-Carrier Interference （ICI）. Performance improvement of LS algorithm and its enhancement on Symbol Error Rate （SER） have been evaluated by computer simulation.

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參考文獻(1)

Wu Song-ping.[J].Bar Ness Y. OFDM channel estimation in the presence of frequency offset and phase noise. ICC 03 IEEE International Conference on Communications, 11-15 May.2003,:-[2]Coleri Sinem, Ergen Mustafa, Puri Anuj, Bahai Ahmad. Channel estimation techniques based on pilot arrangement in OFDM systems[J].IEEE Trans. on Broadcasting.2002, 48(3):223-[3]李國松,周正歐.固定波形時間保護間隔OFDM系統(tǒng)循環(huán)卷積特性研究.信號處理,2004,20(1):35-39.[4]Li Y, Seshadri N, Ariyavisitakul L. Channel estimation for OFDM systems with transmitter diversity in mobile wireless channel[J].IEEE J. on Select. Areas Comm.1999, 17:461-[5]Xie Yong-zhe, Georghiades C N. Two EM-type channel estimation algorithms for OFDM with transmitter diversity[J].IEEE Trans. on Comm.2003, 51(1):106-[6]Zhao Yu-ping; Huang Ai-ping. A novel channel estimation method for OFDM mobile communication systems based on pilot signals and transform-domain processing. IEEE 47th VTC,4-7, May, 1997, vol.3:2089 - 2093.[7]Roy S, Li Cheng-yang. A subspac e blind channel estimation method for OFDM systems without cyclic prefix[J]., IEEE Trans.on Wireless Comm.2002, 1(4):572-579[8]Liavas Athanasios P, Regalia Phillip A, Delmas Jean-Pierre.Blind channel approximation: effective channel order determination[J].IEEE Trans. on Signal Processing.1999, 47(12):3336-[9]Li Y, Cimini L J, Sollenberger N R. Robust channelestimation for OFDM systems with rapid dispersive fading channels[J].IEEE Trans. on Comm.1998, 46(7):902-[10]劉福聲,羅鵬飛.統(tǒng)計信號處理.長沙:國防科技大學出版社,1999:第8章.[11]陸璇.數(shù)理統(tǒng)計基礎.北京:清華大學出版社,1998,附錄V.

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