DocumentCode :
1972812
Title :
An enhanced LMMSE channel estimation method for OFDM systems with virtual subcarriers
Author :
Wei Liu ; Zhanji Wu ; Hao Jin
Author_Institution :
Wireless Signal Process. & Network Laborary, Beijing Univ. of Posts & Telecommun., Beijing, China
fYear :
2011
fDate :
14-16 Oct. 2011
Firstpage :
171
Lastpage :
175
Abstract :
Linear Minimum Mean Square Error (LMMSE) channel estimator has excellent Mean Square Error (MSE) performance in Orthogonal Frequency Division Multiplexing (OFDM) systems. However, two main reasons limit the usefulness of theoretical LMMSE method in practical systems. First, the channel power delay profiles (PDP) are unknown in practical system, and due to the existence of virtual subcarriers, the difficulty in estimating PDP increases. Second, the computation complexity is high. In this case, an enhanced LMMSE channel estimation method for OFDM systems with virtual subcarriers is proposed to approach the performance of theoretical LMMSE method with low computation complexity and no requirement on the detailed channel information. The simulation results indicate that the proposed method outperforms conventional channel estimation methods and achieves approximate performance of theoretical LMMSE method in terms of MSE and Bit Error Rate (BER).
Keywords :
OFDM modulation; channel estimation; error statistics; least mean squares methods; radiocommunication; BER; OFDM systems; PDP; bit error rate; channel power delay profiles; computation complexity; conventional channel estimation methods; enhanced LMMSE channel estimation method; orthogonal frequency division multiplexing systems; virtual subcarriers; wireless communication; LMMSE; OFDM; channel estimation; virtual subcarriers;
fLanguage :
English
Publisher :
iet
Conference_Titel :
Communication Technology and Application (ICCTA 2011), IET International Conference on
Conference_Location :
Beijing
Type :
conf
DOI :
10.1049/cp.2011.0653
Filename :
6192849
Link To Document :
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