Efficient training design for estimation of channel, CFO, and receiver I/Q imbalance in MIMO-OFDM systems

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.

[1]  Jun S. Liu,et al.  Monte Carlo strategies in scientific computing , 2001 .

[2]  Yi Liu,et al.  A Low-Complexity Receive-Antenna-Selection Algorithm for MIMO–OFDM Wireless Systems , 2009, IEEE Transactions on Vehicular Technology.

[3]  Hlaing Minn,et al.  Reduced-complexity baseband compensation of joint Tx/Rx I/Q imbalance in mobile MIMO-OFDM , 2010, IEEE Transactions on Wireless Communications.

[4]  V. K. Jones,et al.  Channel estimation for wireless OFDM systems , 1998, IEEE GLOBECOM 1998 (Cat. NO. 98CH36250).

[5]  Wilhelm Keusgen,et al.  Preamble Based Joint CFO, Frequency-Selective I/Q-Imbalance and Channel Estimation and Compensation in MIMO OFDM Systems , 2011, 2011 IEEE Vehicular Technology Conference (VTC Fall).

[6]  B. Achiriloaie,et al.  VI REFERENCES , 1961 .

[7]  Y. Lee,et al.  Preamble design for joint estimation of CFO and I/Q imbalance for direct conversion OFDM system , 2009, IET Commun..

[8]  Masayoshi Nakamoto,et al.  Training Symbol Design for Channel Estimation and IQ Imbalance Compensation in OFDM Systems , 2012, 2012 IEEE 75th Vehicular Technology Conference (VTC Spring).

[9]  M. Moonen,et al.  Joint compensation of IQ imbalance and frequency offset in OFDM systems , 2003, Radio and Wireless Conference, 2003. RAWCON '03. Proceedings.

[10]  Ali H. Sayed,et al.  Compensation schemes and performance analysis of IQ imbalances in OFDM receivers , 2005, IEEE Transactions on Signal Processing.

[11]  Shuichi Ohno,et al.  Preamble and pilot symbol design for channel estimation in OFDM systems with null subcarriers , 2011, EURASIP J. Wirel. Commun. Netw..

[12]  Hui Liu,et al.  Frequency offset and I/Q imbalance compensation for direct-conversion receivers , 2005, IEEE Transactions on Wireless Communications.

[13]  Shuichi Ohno,et al.  Preamble Based Channel and CFO Estimation for MIMO-OFDM Systems with Null Subcarriers , 2011, IEICE Trans. Fundam. Electron. Commun. Comput. Sci..