MIMO-OFDM系统中一种新的低代价信道估计方法

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A new low-cost channel estimation method for MIMO-OFDM system

LIU Gang;GUO Yi;GE Jian-hua

(State Key Lab. of Integrated Service Networks, Xidian Univ., Xi′an 710071， China)

Received:1900-01-01 Revised:1900-01-01 Online:2005-10-20 Published:2005-10-20

Abstract

Abstract: An accurate channel estimation is crucial for the performance of multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems. In this paper, a novel pilot pattern with higher frequency efficiency is proposed, and a linear minimum mean squared error (LMMSE) channel estimator is derived for MIMO-OFDM systems. In order to track the time-varying channel, an improved direct decision (DD) method is further adopted. Theoretical analysis and numerical results show that the new channel estimation scheme can offer a good performance and a high ability to track the time-varying channel, meanwhile it requires a low complexity especially for systems with a large number of transmit antennas.

Key words: MIMO-OFDM, space-time code, channel estimation, MSE, WER

CLC Number:

TN911

LIU Gang;GUO Yi;GE Jian-hua.

A new low-cost channel estimation method for MIMO-OFDM system

[J].J4, 2005, 32(5): 772-776.

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A new low-cost channel estimation method for MIMO-OFDM system

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