Telecommunications – Transmitter – Noise or interference elimination
Reexamination Certificate
2011-03-01
2011-03-01
Le, Thanh C (Department: 2618)
Telecommunications
Transmitter
Noise or interference elimination
C455S126000, C330S149000
Reexamination Certificate
active
07899416
ABSTRACT:
An RF transmitter (10) includes an RF amplifier (22) that experiences gain-droop distortion as a result of self-heating. A heat compensator (20) is included to insert a gain boost of an amount which is the inverse of the gain droop experienced by the RF amplifier (22). The amount of gain boost is determined by generating a heat signal (88) from low-pass filtering (86) the squared magnitude (82) of a communication signal (14). The heat signal (88) is scaled by a weighting signal (68) estimated by monitoring the amplified RF signal (42) at the output of the RF amplifier (22). A nonlinear relationship section (96) then transforms the scaled signal into a gain-boost signal (94) that corresponds to the inverse of gain droop in the RF amplifier (22).
REFERENCES:
patent: 4019150 (1977-04-01), Lurey et al.
patent: 5177453 (1993-01-01), Russell et al.
patent: 5339046 (1994-08-01), Kornfeld et al.
patent: 5598127 (1997-01-01), Abbiati
patent: 5867065 (1999-02-01), Leyendecker
patent: 5923712 (1999-07-01), Leyendecker et al.
patent: 5959500 (1999-09-01), Garrido
patent: 6011415 (2000-01-01), Hahn et al.
patent: 6118335 (2000-09-01), Nielsen et al.
patent: 6141390 (2000-10-01), Cova
patent: 6282247 (2001-08-01), Shen
patent: 6731168 (2004-05-01), Hedberg et al.
patent: 7170343 (2007-01-01), Jin et al.
patent: 7279972 (2007-10-01), Smithson
patent: 7551905 (2009-06-01), Kubo et al.
patent: 2003/0006845 (2003-01-01), Lopez et al.
patent: 2003/0146787 (2003-08-01), Hedberg et al.
patent: 2004/0247042 (2004-12-01), Sahlman
patent: 2005/0157814 (2005-07-01), Cova et al.
patent: 2005/0163249 (2005-07-01), McCallister
patent: 2005/0163252 (2005-07-01), McCallister et al.
patent: 2005/0195919 (2005-09-01), Cova
patent: 2005/0212598 (2005-09-01), Lin et al.
patent: 2006/0091949 (2006-05-01), Smithson
patent: 2007/0018722 (2007-01-01), Jaenecke
International Search Report and Written Opinion regarding PCT/US2008/080485, dated Dec. 23, 2008.
H.Q. He and M. Faulkner, Performance of Adaptive Predistortion with Temperature, Fifth International Symposium on Signal Processing and its Applications, ISSPA '99, Brisbane, Australia, Aug. 22-25, 1999.
E. Schurack, et al., Analysis and Measurements of Nonlinear Effects in Power Amplifiers Caused by Thermal Power Feedback, Journal Article, Federal Armed Forces University Munich, 1992 IEEE.
J.S. Kenney and P. Fedorenko, Identification of RF Power Amplifier Memory Effect Origins using Third-Order Intermodulation Distortion Amplitude and Phase Asymmetry, Journal Article, School of Electrical and Computer Engineering, Atlanta, Georgia, 2006 IEEE.
O. Tornblad, et al., Modeling and Measurements of Electrical and Thermal Memory Effects for RF Power LDMOS, Journal Article, 2007 IEEE.
Ding et al., “A Memory Polynomial Predistorter Implemented Using TMS320C67XX”, (Proceedings of Texas Instruments Developer Conference), Feb. 2004, pp. 1-7, Texas, USA.
Hammi et al., “On the Effects of the Average Power of Training Sequences Used to Synthesize Memory Digital Predistorters in WCDMA Transmitters”, (© 2007 EuMA Proceedings of the 37th European Microwave Conference), Oct. 2007, pp. 174-177, Munich, Germany.
He et al., “Performance of Adaptive Predistortion With Temperature in RF Power Amplifier Linearization”, (Fifth International Symposium on Signal Processing and its Applications), Aug. 1999, pp. 717-720, Brisbane, Australia.
Liu et al., “Deembedding Static Nonlinearities and Accurately Identifying and Modeling Memory Effects in Wide-Band RF Transmitters”, (IEEE Transactions on Microwave Theory and Techniques), Nov. 2005, pp. 3578-3587, vol. 53, No. 11, Canada.
Morgan et al., “A Generalized Memory Polynomial Model for Digital Predistortion of RF Power Amplifiers”, (IEEE Transactions on Signal Processing), Oct. 2006, pp. 3852-3860, vol. 54, No. 10, Canada.
Paasschens et al., “Dependence of Thermal Resistance on Ambient and Actual Temperature”, (Proceedings of the 2004 Meeting on Bipolar Bicmos Circuits & Technology), Sep. 2004, pp. 96-99, The Netherlands.
Schurack et al., “Analysis and Measurement of Nonlinear Effects in Power Amplifiers Caused by Thermal Power Feedback”, (IEEE International Symposium on Circuits and Systems), May 1992, pp. 758-761, Munich, Germany.
Tornblad et al., “Modeling and Measurements of Electrical and Thermal Memory Effects for RF Power LDMOS”, (IEEE/MTT-S International Microwave Symposium), Jun. 2007, pp. 2015-2018, USA.
Yong-Sheng et al., “Research of Electro-Thermal Memory Effect of RF Power Amplifier based on LDMOS EFT”, (4th Asia-Pacific Conference on Environmental Electromagnetics), Aug. 2006, CEEM'2006/Dalian 4A2-09, pp. 787-791, China.
Zhu et al., “An Overview of Volterra Series Based Behavioral Modeling of RF/Microwave Power Amplifiers”, (RF & Microwave Research Group University College Dublin © 2006 IEEE), pp. 1-5, Ireland.
Brombaugh Eric M.
McCallister Ronald Duane
Crestcom, Inc.
Le Thanh C
Meschkow & Gresham P.L.C.
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