Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
1999-09-14
2008-08-05
Burd, Kevin M (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
Reexamination Certificate
active
07409007
ABSTRACT:
This invention relates to a method and apparatus for reducing adjacent channel power in wireless communication systems. More particularly, the present invention is directed to a system for digitally and adaptively pre-distorting a signal that includes applying a correction to the signal before it is applied to the input of an amplifier such that the correction is equal and opposite to anticipated distortion produced by the amplifier. Thus, the correction and the amplifier distortion cancel one another resulting in a system with an overall linear transfer characteristic. In these circumstances, the adjacent channel power is desirably reduced.
REFERENCES:
patent: 5867065 (1999-02-01), Leyendecker
patent: 5920808 (1999-07-01), Jones et al.
patent: 5923712 (1999-07-01), Leyendecker et al.
patent: 5963549 (1999-10-01), Perkins et al.
patent: 6288610 (2001-09-01), Miyashita
patent: 6493543 (2002-12-01), Shin et al.
patent: 6507732 (2003-01-01), Dajer et al.
patent: 6614854 (2003-09-01), Chow et al.
patent: 0 751 630 (1997-01-01), None
patent: 0 881 807 (1997-01-01), None
patent: WO 99/33170 (1999-07-01), None
J. A. Nelder et al., “A Simplex Method For Function Minimization,”Computer Journal, vol. 7, pp. 308-313 (1965).
Claudio G. Rey, “Predistorter Linearizes CDMA Power Amplifiers,”Microwaves&RF, pp. 114, 116, 119-120, 122-123 (Oct. 1998).
Lars Sundstrom et al., “Quantization Analysis and Design of a Digital Predistortion Linearizer for RF Power Amplifiers,”IEEE Transactions on Vehicular Technology, vol. 45, No. 4, pp. 707-719 (Nov. 1996).
T. Louie Valeña,An Adaptive Predistorter for TDMA Transmitters Using a Heterodyne Architecture, 1999 IEEE 49th Vehicular Technology Conference, Houston, TX, May 16-20, 1999, IDDD Vehicular Technology Conference, New York, NY, IEEE, US, vol. 3, Conf. 49, May 16, 1999, pp. 1915-1919, XP000936145, ISBN: 0-7803-5566-0, abstract, Figure 2.
Yuguang Huang and W. F. McColl,An Improved Simplex Method for Function Minimization, Systems, May and Cybernetics, 1996, IEEE International Conference on Beijing, China, Oct. 14-17, 1996, New York, NY, USA, IEEE, US, Oct. 14, 1996, pp. 1702-1705, XP010206741, ISBN: 0-7803-3280-6, abstract.
Johnson Robert Everest
Leney Mark Thomas
Vella-Coleiro George Philip
Burd Kevin M
Lucent Technologies - Inc.
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