Title :
Subcarrier allocation based compensation for carrier frequency offset and I/Q imbalances in OFDM systems
Author :
Lin, Hai ; Yamashita, Katsumi
Author_Institution :
Dept. of Electr. & Inf. Syst., Osaka Prefecture Univ., Sakai
Abstract :
We propose a novel subcarrier allocation (SCA) based approach for compensating carrier frequency offset (CFO) and I/Q imbalances in direct-conversion OFDM receivers. From the matrix representation of OFDM signals with CFO and I/Q imbalances, maximum likelihood CFO estimation and the associated SCA are given. Then, an SCA-based algorithm is proposed for the I/Q imbalances compensation. Moreover, the proposed approach is extended to a blind compensation scheme for OFDM signals with asymmetric SCA.
Keywords :
OFDM modulation; maximum likelihood estimation; receivers; I/Q imbalances; OFDM receivers; OFDM systems; carrier frequency offset; maximum likelihood CFO estimation; subcarrier allocation; Digital audio broadcasting; Digital video broadcasting; Frequency division multiplexing; Local oscillators; Mathematical model; Maximum likelihood estimation; OFDM; Radio spectrum management; Transmitters; Wireless communication; Carrier frequency offset (CFO); I/Q imbalance; orthogonal frequency division multiplexing (OFDM);
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/T-WC.2009.071007
