Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2006-05-26
2010-06-08
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
C375S296000, C375S346000, C375S348000, C375S232000, C375S254000
Reexamination Certificate
active
07733978
ABSTRACT:
A digital adaptive predistorter look up table (DAPD-LUT) technique dynamically adapts a look up table (LUT) an LUT spacing for linearizing a power amplifier (PA). It optimizes the LUT spacing for the PA without prior knowledge of system state information. A size-N LUT divides a whole unsaturated PA input amplitude range into N bins, each predistorted by an entry of the LUT. The LUT is indexed by an input amplitude of a modulated signal via an index mapper to implement an unconditionally non-uniform LUT spacing. A spacing adaptor online interactively adapts the LUT spacing. The adapted LUT spacing balances the inter-modulation distortion (IMD) power at the PA output corresponding to each bin, so that the total IMD power at the PA output is minimized. This dynamically-optimum technique is practical, robust, and with low complexity.
REFERENCES:
patent: 5049832 (1991-09-01), Cavers
patent: 2003/0184374 (2003-10-01), Huang et al.
patent: 2005/0017801 (2005-01-01), Bachman et al.
patent: 2005/0140438 (2005-06-01), Jin et al.
patent: 200428763 (2004-12-01), None
J. K. Cavers, Amplifier linearization using a digital predistorter with fast adaptation and low memory requirements,.IEEE Trans. On Veh. Technol., vol. 39, pp. 374-382, Nov. 1990.
L. Sundstrom, M. Faulkner, and M. Johansson, Quantization analysis and design of a digital predistortion linearizer for RF power amplifiers,. IEEE Trans. on Veh. Technol., vol. 45, pp. 707-719, Nov. 1996.
A. S. Wright and W. G. Durtler, Experimental performance of an adaptive digital linearized power amplifier ,.IEEE Trans. on Veh. Technol., vol. 41, pp. 395-400, Nov. 1992.
J. K. Cavers, Optimum table spacing in predistorting amplifier linearizers,. IEEE Trans. On Veh. Technol., vol. 48, pp. 1699-1705, Sep. 1999.
J. Y. Hassani and M. Kamarei, A Flexible method of LUT indexing in digital pre-distortion linearization of RF power amplifiers,. IEEE International Symposium on Circuits and Syst., vol. 1, pp. 53-56, May 2001.
Chen Jiunn-Tsair
Lin Chih-Hung
Industrial Technology Research Institute
Liu Shuwang
Timory Kabir A
LandOfFree
Apparatus and method of dynamically adapting the LUT spacing... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method of dynamically adapting the LUT spacing..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method of dynamically adapting the LUT spacing... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4195852