Envelope limiting for polar modulators

Details Envelope limiting for polar modulators Envelope limiting for polar modulators

2007-01-30

2007-01-30

Vo, Nguyen T. (Department: 2618)

Telecommunications

Transmitter

Amplitude modulation

C455S110000, C455S127200, C332S145000

Reexamination Certificate

active

10202501

ABSTRACT:
Envelope limiting for a polar modulator. A system is provided that intelligently compresses the amplitude modulation in a polar modulator so that it can be implemented with a single-stage variable gain amplifier. Limiting the amplitude modulation range on the low side prevents collapse of the transmit signal's time-varying envelope and eases circuit implementation. Limiting the amplitude modulation range on the high side reduces the peak-to-average ratio of the waveform and thereby improves the efficiency of the radio transmitter.

REFERENCES:
patent: 5781849 (1998-07-01), Carlsson et al.
patent: 6438360 (2002-08-01), Alberth et al.
patent: 6917791 (2005-07-01), Chadwick
patent: 2002/0090921 (2002-07-01), Midtgaard et al.
patent: 2004/0071225 (2004-04-01), Suzuki et al.
patent: 403175823 (1991-07-01), None

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