Pre-distortion of non-linear devices by post-detection

Details Pre-distortion of non-linear devices by post-detection Pre-distortion of non-linear devices by post-detection

2005-02-01

2005-02-01

Choe, Henry (Department: 2817)

Amplifiers

Hum or noise or distortion bucking introduced into signal...

C375S297000

Reexamination Certificate

active

06850114

ABSTRACT:
A method and an arrangement is disclosed for linearizing the output signal from an inherently non-linear device, e.g. an amplifier, producing intermodulation or non-linear products. A pre-distorter having a unity transfer function is located between a signal input and the input of the inherently non-linear device. Furthermore a second device forming a post-distorter is coupled to the output of the nonlinear device in a way to be able to handle the amplified output signal or a portion of the output signal. According to the present method the post-distorter is optimized to give as output the same signal spectrum content as what is input to the non-linear device, whereafter the achieved parameters of the post-distorter are transferred to the pre-distorter. In other words a copy of the optimized post-distorter is then used as a pre-distorter in front of the non-linear device to obtain an improved output signal in terms of signal quality from the inherently non-linear device. The post-distorter is then optimized once more and parameters are again transferred to the pre-distorter as a further as a further small correction. In operation this is then generally repeated in a suitable scheduled way to give an ongoing correction to the pre-distortion. The pre-distorter and post-distorter may both be either digital devices or analog devices.

REFERENCES:
patent: 6016076 (2000-01-01), Arell
patent: 6075412 (2000-06-01), Bainvoll
patent: 6396327 (2002-05-01), Lam
Ghaderi et al, “Adaptive Predistortion Lineariser Using Polynomial Functions”, IEE Proceedings Communications, Apr. 2, 1994, vol. 141, No. 2, pp. 1526-1528.
Ghaderi et al, “Fast Adaptive Predistortion Lineariser Using Polynomial Functions”, Electronic Letters, Aug. 19, 1993, vol. 29, No. 17, pp. 49-55.
International Search Report mail Mar. 26, 2003 in corresponding PCT application PCT/SE01/02628.
International Preliminary Examination Report mailed Oct. 23, 2002 in corresponding PCT application PCT/SE01/02628.

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