A Time-Domain Joint Estimation Algorithm for CFO and I/Q Imbalance in Wideband Direct-Conversion Receivers

Carrier frequency offset (CFO) and in-phase and quadrature-phase (I/Q) imbalance are two of the common front-end impairments in low-cost communication devices. It is known that CFO can cause significant performance degradation in multi-carrier modulation (MCM) systems. Also, the existence of the I/Q imbalance usually reduces the accuracy of CFO estimation. In this paper, we propose a new data-aided scheme for the joint estimation of CFO and I/Q imbalance using simple matrix formulation. The proposed algorithms utilize only the periodicity of the generalized periodic pilot (GPP). They do not need to know the channel impulse response and the exact values of the training sequence. Moreover, our method has a low complexity and its performance compares favorably with the existing methods.

[1]  Mikko Valkama,et al.  Circularity-Based I/Q Imbalance Compensation in Wideband Direct-Conversion Receivers , 2008, IEEE Transactions on Vehicular Technology.

[2]  Marc Moonen,et al.  Efficient Compensation of RF Impairments for OFDM Systems , 2009, 2009 IEEE Wireless Communications and Networking Conference.

[3]  Liesbet Van der Perre,et al.  Joint estimation of carrier frequency offset and IQ imbalance for 4G mobile wireless systems , 2006, 2006 IEEE International Conference on Communications.

[4]  Behzad Razavi,et al.  Design considerations for direct-conversion receivers , 1997 .

[5]  Mamiko Inamori,et al.  IQ Imbalance Compensation Scheme in the Presence of Frequency Offset and Dynamic DC Offset for a Direct Conversion Receiver , 2009, VTC Spring 2009 - IEEE 69th Vehicular Technology Conference.

[6]  Mikko Valkama,et al.  Pilot-Based Compensation of Frequency-Selective I/Q Imbalances in Direct-Conversion OFDM Transmitters , 2008, 2008 IEEE 68th Vehicular Technology Conference.

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

[8]  V.K.-P. Ma,et al.  Analysis of IQ imbalance on initial frequency offset estimation in direct down-conversion receivers , 2001, 2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471).

[9]  See-May Phoong,et al.  Joint estimation of I/Q imbalance, CFO and channel response for OFDM systems , 2009, 2009 IEEE International Conference on Acoustics, Speech and Signal Processing.

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

[11]  Wei-Ping Zhu,et al.  Carrier Frequency Offset Estimation and I/Q Imbalance Compensation for OFDM Systems , 2007, EURASIP J. Adv. Signal Process..

[12]  Marc Moonen,et al.  Joint Compensation of OFDM Frequency Selective Transmitter and Receiver IQ Imbalance , 2007, 2007 IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP '07.

[13]  Ying Chen,et al.  Frequency Offset Estimation for OFDM Systems in the Presence of I/Q Mismatch , 2007, 2007 IEEE 18th International Symposium on Personal, Indoor and Mobile Radio Communications.

[14]  Mikko Valkama,et al.  Frequency-Selective I/Q Mismatch Calibration of Wideband Direct-Conversion Transmitters , 2008, IEEE Transactions on Circuits and Systems II: Express Briefs.

[15]  See-May Phoong,et al.  A New Estimation Algorithm for CFO and I/Q Imbalance in Wideband Direct-Conversion Receivers , 2011, 2011 IEEE Global Telecommunications Conference - GLOBECOM 2011.

[16]  Paul H. Moose,et al.  A technique for orthogonal frequency division multiplexing frequency offset correction , 1994, IEEE Trans. Commun..

[17]  Mikko Valkama,et al.  Advanced methods for I/Q imbalance compensation in communication receivers , 2001, IEEE Trans. Signal Process..

[18]  See-May Phoong,et al.  A New Algorithm for Carrier Frequency Offset Estimation in the Presence of I/Q Imbalance , 2010, 2010 IEEE 71st Vehicular Technology Conference.

[19]  Hai Lin,et al.  Low-complexity pilot-aided compensation for carrier frequency offset and I/Q imbalance , 2010, IEEE Transactions on Communications.

[20]  Jui-Yuan Yu,et al.  Estimation of Carrier Frequency Offset With I/Q Mismatch Using Pseudo-Offset Injection in OFDM Systems , 2008, IEEE Transactions on Circuits and Systems I: Regular Papers.

[21]  G.B. Giannakis,et al.  Carrier frequency offset estimation for OFDM-based WLANs , 2001, IEEE Signal Processing Letters.

[22]  Marc Moonen,et al.  Joint Adaptive Compensation of Transmitter and Receiver IQ Imbalance Under Carrier Frequency Offset in OFDM-Based Systems , 2007, IEEE Transactions on Signal Processing.

[23]  André Bourdoux,et al.  Low-Complexity EM-based Joint Acquisition of the Carrier Frequency Offset and IQ Imbalance , 2008, IEEE Transactions on Wireless Communications.

[24]  Marc Moeneclaey,et al.  BER sensitivity of OFDM systems to carrier frequency offset and Wiener phase noise , 1995, IEEE Trans. Commun..

[25]  Ying Chen,et al.  Low-Complexity Estimation of CFO and Frequency Independent I/Q Mismatch for OFDM Systems , 2009, EURASIP J. Wirel. Commun. Netw..

[26]  Mamiko Inamori,et al.  Performance of frequency offset estimation in the presence of IQ imbalance for OFDM direct conversion receivers , 2009, 2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing.