Title :
Efficient training design for estimation of channel, CFO, and receiver I/Q imbalance in MIMO-OFDM systems
Author :
Manasseh, Emmanuel ; Ohno, S. ; Yamamoto, Takayuki
Author_Institution :
Hiroshima Univ., Higashi-Hiroshima, Japan
Abstract :
In this paper, training design for estimation of frequency selective channels, carrier frequency offset (CFO) and in-phase/quadrature-phase (I/Q) imbalance in multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems is proposed. We utilize convex optimization technique to optimize power of all active subcarriers, then we employ adaptive Markov chain Monte Carlo (AMCMC) techniques to select training sequence that minimizes the channel estimate mean squared error (MSE) while suppressing the effect of the I/Q imbalance. To estimate CFO, maximum likelihood (ML) based scheme that utilizes two successive OFDM training symbols is deployed. Numerical simulations are provided to corroborate the efficacy of the proposed design.
Keywords :
MIMO communication; Markov processes; Monte Carlo methods; OFDM modulation; channel estimation; convex programming; maximum likelihood sequence estimation; mean square error methods; minimisation; radio receivers; AMCMC technique; CFO; I/Q imbalance effect suppression; MIMO; ML based scheme; MSE minimization; OFDM system; active subcarrier; adaptive Markov chain Monte Carlo; carrier frequency offset; convex optimization technique; frequency selective channel estimation; maximum likelihood estimation; mean squared error; multiple input multiple output; orthogonal frequency division multiplexing; power optimization; receiver I/Q imbalance estimation; training sequence selection; Channel estimation; Estimation; OFDM; Receiving antennas; Training; Vectors; AMCMC; CFO; I/Q imbalance; MIMO; ML; OFDM;
Conference_Titel :
Communications and Information Technologies (ISCIT), 2013 13th International Symposium on
Conference_Location :
Surat Thani
Print_ISBN :
978-1-4673-5578-0
DOI :
10.1109/ISCIT.2013.6645883
