Signal peak reduction circuit for non-constant envelope...

Details Signal peak reduction circuit for non-constant envelope... Signal peak reduction circuit for non-constant envelope...

2008-05-20

2008-05-20

Ghebretinsae, Temesghen (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Antinoise or distortion

C375S296000

Reexamination Certificate

active

10311872

ABSTRACT:
Circuits for reducing the signal peaks in telecommunications signals are described. The circuits and methods are preferably adapted for reducing the peak to average power ratio of non-constant envelope modulation signals. In one example the circuit includes a band-limiting filter for limiting the bandwidth of a data bearing signal and a predictive filter for predicting peaks in the data bearing signal at the output of the pulse-shaping filter. The circuit also includes a clipping processor for generating a compensation signal in response to one or more signal peaks predicted by the predictive filter and a signal combining device for applying the compensation signal to the data bearing signal prior to amplification of the data bearing signal.

REFERENCES:
patent: 4371842 (1983-02-01), Lee
patent: 4495643 (1985-01-01), Orban
patent: 5493587 (1996-02-01), Sandri et al.
patent: 5608760 (1997-03-01), Sandri et al.
patent: 6385238 (2002-05-01), Nguyen

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