Peak windowing for crest factor reduction

Details Peak windowing for crest factor reduction Peak windowing for crest factor reduction

2011-08-23

2011-08-23

Ha, Dac V (Department: 2611)

Pulse or digital communications

Receivers

Interference or noise reduction

C375S346000, C375S316000

Reexamination Certificate

active

08005177

ABSTRACT:
In order to reduce the crest factor of a signal for power amplification, a windowing function is applied. The windowing function that is applied is a triangular windowing function. The use of this function produces good results when those results are measured in terms of their effect on a transmitted signal in a WCDMA communications system. The filter for performing the triangular windowing function receives the signal, and applies it to a first delay element. The output from the first delay element is applied to a second delay element. An adder forms a weighted sum of the received signal and the signals at the outputs of the first delay element and the second delay element. A first accumulator is connected to receive an input from the adder and provides a first accumulator output, while a second accumulator is connected to receive an input from the first accumulator output and provides a second accumulator output.

REFERENCES:
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patent: 2002/0067771 (2002-06-01), Sander
patent: 2003/0179829 (2003-09-01), Pinckley et al.
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patent: 2004/0203430 (2004-10-01), Morris
Vaananen, Olli et al., “Effect of Clipping in Wideband CDMA System and Simple Algorithm for Peak Windowing”;2002 International Conference on Third Generation Wireless and Beyond, 7 pages.

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