Title :
Novel subspace methods for blind estimation of multiple CFOs in MIMO-OFDM systems
Author :
Santra, Avik ; Hari, K.V.S.
Author_Institution :
Dept. of Electr. Commun. Eng., Indian Inst. of Sci., Bangalore, India
Abstract :
The problem of estimating multiple Carrier Frequency Offsets (CFOs) in the uplink of MIMO-OFDM systems with Co-Channel (CC) and OFDMA based carrier allocation is considered. The tri-linear data model for generalized, multiuser OFDM system is formulated. Novel blind subspace based estimation of multiple CFOs in the case of arbitrary carrier allocation scheme in OFDMA systems and CC users in OFDM systems based on the Khatri-Rao product is proposed. The method works where the conventional subspace method fails. The performance of the proposed methods is compared with pilot based Least-Squares method.
Keywords :
MIMO communication; OFDM modulation; channel allocation; frequency division multiple access; frequency estimation; Khatri-Rao product; MIMO-OFDM systems; OFDMA based carrier allocation; arbitrary carrier allocation scheme; blind subspace based estimation method; cochannel allocation; multiple CFO; multiple carrier frequency offset estimation; multiuser OFDM system; pilot based least-squares method; trilinear data model; Cost function; Direction of arrival estimation; Estimation; Generators; OFDM; Receiving antennas; Resource management; Co-channel users; Khatri-Rao product; MIMO-OFDM; Multiple Carrier Frequency Offsets; OFDMA; subspace method;
Conference_Titel :
Signal Processing (ICSP), 2010 IEEE 10th International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-5897-4
DOI :
10.1109/ICOSP.2010.5656649
