DocumentCode :
3462276
Title :
Time-domain ML channel estimation considering antenna switching time for RF-MIMO-OFDM
Author :
Yasukawa, Masahiro ; Saba, Takahiko
Author_Institution :
Dept. of Comput. Sci., Chiba Inst. of Technol., Narashino, Japan
fYear :
2011
fDate :
5-9 Dec. 2011
Firstpage :
1359
Lastpage :
1363
Abstract :
In this paper, we propose a channel estimation method for radio frequency multiple-input multiple-output orthogonal frequency division multiplexing (RF-MIMO-OFDM) systems. In RF-MIMO-OFDM systems, a receiver combines the received signals at the RF front-end. This implies that a receiver can estimate only one of MIMO channels during one OFDM symbol duration. Therefore, the conventional channel estimation method requires a number of pilot OFDM symbols in proportion to the numbers of transmit antennas and receive antennas. If the channels are varying during the pilot transmission, the accuracy of the conventional channel estimation is deteriorated. In this paper, we propose a channel estimation method which can estimate channels with a shorter time period considering the antenna switching time. Our proposed method uses time-domain maximum likelihood estimation and pilot symbols which have a repetitive waveform within one OFDM symbol duration. The proposed method estimates channel impulse responses (CIRs) of multiple channels during one OFDM symbol duration. From simulation results, we show that the proposed estimation method achieves a better estimation performance than the conventional estimation method. Furthermore, the error performance is also improved by the use of the proposed method.
Keywords :
MIMO communication; OFDM modulation; antenna arrays; channel estimation; maximum likelihood estimation; radio receivers; receiving antennas; time-domain analysis; transient response; transmitting antennas; MIMO channel estimation; RF front-end; RF-MIMO-OFDM; antenna switching time; multiple CIR estimation; multiple channel impulse response estimation; orthogonal frequency division multiplexing system; pilot symbol; radio frequency multiple-input multiple-output system; radio receiver; receive antenna; repetitive waveform; time-domain ML channel estimation method; time-domain maximum likelihood channel estimation method; transmit antenna; Channel estimation; Estimation; Frequency domain analysis; OFDM; Receiving antennas; Switches;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
GLOBECOM Workshops (GC Wkshps), 2011 IEEE
Conference_Location :
Houston, TX
Print_ISBN :
978-1-4673-0039-1
Electronic_ISBN :
978-1-4673-0038-4
Type :
conf
DOI :
10.1109/GLOCOMW.2011.6162408
Filename :
6162408
Link To Document :
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