Apparatus and method for compensating IQ imbalance in OFDM...

Details Apparatus and method for compensating IQ imbalance in OFDM... Apparatus and method for compensating IQ imbalance in OFDM...

2006-02-23

2009-08-11

Deppe, Betsy L (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C375S324000

Reexamination Certificate

active

07573954

ABSTRACT:
An apparatus and method of an OFDM system for compensating IQ imbalance. The apparatus includes a mixer module for mixing a wireless signal to generate a pair of in-phase and quadrature-phase analog signals; an in-phase and quadrature-phase imbalance parameter estimation unit coupled to the mixer module for estimating a gain compensation value and a phase compensation value; and a signal compensation module coupled to the in-phase and quadrature-phase imbalance parameter estimation unit for compensating the pair of in-phase and quadrature-phase analog signals for gain imbalance and phase imbalance, according to the gain compensation value and the phase compensation value respectively.

REFERENCES:
patent: 6044112 (2000-03-01), Koslov
patent: 7020220 (2006-03-01), Hansen
patent: 2003/0231723 (2003-12-01), Hansen
patent: 2005/0152463 (2005-07-01), DeChamps et al.
A. Schuchert. R. Hasholzner, P. Antoine., “A Novel IQ Imbalance Compensation Scheme for the Reception of OFDM Signals.”, IEEE Trans. On Consumer Electronics, Aug. 2001, pp. 313-318, vol. 47, No. 3.
J. Tubbax, B. Cóme, L. Van Der Perre, L. Deneire, S. Donnay, M. Engels, “Compensation of IQ imbalance in OFDM systems.”, 2003 IEEE, pp. 3403-3407.
S. Fouladifard, H. Shafiee, “On Adaptive cancellation of IQ Mismatch in OFDM Receivers,”, ICASSP 2003, pp. IV-564-IV-567, 2003 IEEE.

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