Telecommunications – Receiver or analog modulated signal frequency converter – With wave collector
Reexamination Certificate
2011-07-26
2011-07-26
Nguyen, Lee (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
With wave collector
C455S302000
Reexamination Certificate
active
07986930
ABSTRACT:
A wireless communication system receiver compensates a received signal containing an IQ gain imbalance prior to performing frequency correction. The IQ gain imbalance in the signal is estimated after frequency correction, providing an IQ gain imbalance estimate for subsequent IQ gain imbalance compensation. The IQ gain imbalance estimation includes formulating a plurality of hypotheses of phase error between I and Q signal components, and taking as the actual phase error the hypothesis that yields the maximum power ratio between I and Q signal components. The maximum power ratio is differentiated with respect to the IQ imbalance estimate. The IQ gain imbalance estimate is updated as a function of its prior value(s), the maximum power ratio, and the derivative of the maximum power ratio.
REFERENCES:
patent: 6442217 (2002-08-01), Cochran
patent: 6515980 (2003-02-01), Bottomley
patent: 6999501 (2006-02-01), Sawyer
patent: 7010278 (2006-03-01), Kirschenmann et al.
patent: 7035341 (2006-04-01), Mohindra
patent: 7076008 (2006-07-01), Jeong
patent: 7130359 (2006-10-01), Rahman
patent: 7133657 (2006-11-01), Kuenen et al.
patent: 7173988 (2007-02-01), Cochran et al.
patent: 7177372 (2007-02-01), Gu
patent: 7184714 (2007-02-01), Kutagulla et al.
patent: 7190733 (2007-03-01), Sugar
patent: 7242730 (2007-07-01), Kasperkovitz
patent: 2003/0007574 (2003-01-01), Li et al.
patent: 2003/0072393 (2003-04-01), Gu
patent: 2003/0165203 (2003-09-01), Mohindra
patent: 2004/0095993 (2004-05-01), Liu et al.
patent: 2004/0165678 (2004-08-01), Nadiri
patent: 2005/0070236 (2005-03-01), Paulus
patent: 2005/0152476 (2005-07-01), Coersmeier
patent: 2005/0243218 (2005-11-01), Yee et al.
patent: 2006/0034218 (2006-02-01), Ozluturk et al.
patent: 2006/0153318 (2006-07-01), Sugar
patent: 2006/0229051 (2006-10-01), Narayan et al.
patent: 2006/0252399 (2006-11-01), Paulus
patent: 2006/0256216 (2006-11-01), Takahito et al.
patent: 2006/0270375 (2006-11-01), Beamish et al.
patent: 2006/0281411 (2006-12-01), Isaac et al.
patent: 2007/0081614 (2007-04-01), Su
patent: 2007/0097271 (2007-05-01), Gao et al.
patent: 2007/0116149 (2007-05-01), Sugar
patent: 2008/0095249 (2008-04-01), Yoon et al.
patent: 1 416 691 (2006-03-01), None
Cao, M. et al. “Parametric Modeling in Mitigating the I/Q Mismatch: Estimation, Equalization, and Performance Analysis.” Annual Conference on Information Sciences and Systems, Mar. 2006, pp. 1286-1290.
Lohtia, A. et al. “An Adaptive Digital Technique for Compensating for Analog Quadrature Modulator / Demodulator Impairments.” IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, May 1993, vol. 2, pp. 447-450.
Zhu, Z. et al. “Bias Analysis of a Gain/Phase/DC-Offset Estimation Technique for Direct Frequency Conversion Modulators.” IEEE International Conference on Acoustics, Speech, and Signal Processing, Mar. 2005, vol. 3, pp. iii/825-iii/828.
Yu, J. et al. “A Novel Technique for I/Q Imbalance and CFO Compensation in OFDM Systems.” IEEE International Symposium on Circuits and Systems, May 2005, vol. 6, pp. 6030-6033.
Yamaoka, A. et al. “A Novel Error Separation Technique for Quadrature Modulators and Demodulators.” IEEE Radio and Wireless Symposium, Jan. 2007, pp. 563-566.
Xing, G. et al. “Frequency Offset and I/Q Imbalance Compensation for Direct-Conversion Receivers.” IEEE Transactions on Wireless Communications, Mar. 2005, vol. 4, No. 2, pp. 673-680.
Yan, F. et al. “Carrier Frequency Offset Estimation for OFDM Systems with I/Q Imbalance.” The 47th IEEE International Midwest Symposium on Circuits and Systems, Jul. 25-28, 2004, vol. 2, pp. II-633-II-636.
Tubbax, J. et al. “Joint Compensation of IQ Imbalance and Frequency Offset in OFDM Systems.” Proceedings of Radio and Wireless Conference 2003 (RAWCON '03), Aug. 10-13, 2003, pp. 39-42.
Simoens, S. et al. “New I/Q Imbalance Modeling and Compensation in OFDM Systems with Frequency Offset.” The 13th International Symposium on Personal, Indoor and Mobile Radio Communications 2002, Sep. 15-18, 2002, vol. 2, pp. 561-566.
Valkama, Mikko et al. “A Novel Image Rejection Architecture for Quadrature Radio Receivers.” IEEE Transactions on Circuits and Systems II: Express Briefs, Feb. 2004, vol. 51, No. 2, pp. 61-68.
Yu, L. et al. “Novel Adaptive Mismatch Cancellation System for Quadrature IF Radio Receivers.” IEEE Transactions on Circuits and systems II: Express Briefs, IEEE Service Center, New York, NY, US, vol. 46, No. 6, Jun. 1, 1999.
Lindoff, B. et al. “IQ Imbalance Image Suppression.” Co-pending U.S. Appl. No. 11/832,695, filed Aug. 2, 2007.
Jui-Yuan Yu et al., A Novel Technique for I/Q Imbalance and CFO Compensation in OFDM Systems, Circuits and Systems, 2005, ISCAS 2005, IEEE International Symposium O N Kobe, Japan, May 23, 2005.
Lindoff Bengt
Reial Andres
Coates & Bennett PLLC
Nguyen Lee
Telefonaktiebolaget LM Ericsson (publ)
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