[OFDM信道估计]A COM PARISON OF TW O 2D CHANNEL ESTIMATORS FOR OFDM SYSTEM

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A COM PARISON OF TW O 2D CHANNEL ESTIMATORS FOR OFDM SYSTEM

Shu Feng Cheng Shixin Chen M ing

Abstract The paper deals with two—dimensional(2D)channel estimation of Orthogonal Frequency
Division Multiplexing(OFDM)system i1 slow fading wireless channe1．We concentrate on two channel
estimation schemes：Least Square (LS)+Weighted BiLinear (WBL)and LS+Linear Minimum
Mean．Squared Error(LMMSE)where the first method is proposed in this paper．After theory analysis
and simulation in Typical Urban(TU)channel，we find that LS+LMMSE achieves the optimal perform—
ance by exploiting prior knowledge of channel whereas LS+W BL．without requiring channe1 knowl—
edge and with only llalf of the computational amount of LS+LMM SE．approaches LS+LMM SE in Bit
Error Ratio(B ER)performance when tile distance of two adjoining pilot symbols along frequency di—
rection is sufi ciently smal1．This makes LS+WBL very suitable for wideband wireless applications．
Key words OrthogonaI Frequency Division Multiplexing(OFDM)；Linear Minimum Mean—Squared
Error fLMMSE)；Weighted BiLinear(WBL)；ChanneI cstimation：Computational anlotlnt

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刘景景

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liuds7615

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kylkzy

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citta

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123wenni

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