Phase-to-frequency conversion for polar transmitters

Details Phase-to-frequency conversion for polar transmitters Phase-to-frequency conversion for polar transmitters

2007-06-19

2011-12-27

Tran, Pablo (Department: 2618)

Telecommunications

Transmitter

Plural modulation

C455S108000, C455S110000, C455S118000, C455S205000, C375S295000, C375S296000

Reexamination Certificate

active

08086189

ABSTRACT:
The present invention relates to a polar transmission method and a polar transmitter for transmitting phase and amplitude components derived from in-phase (I) and quadrature-phase (Q) components of an input signal. A first conversion is provided for converting the in-phase (I) and quadrature-phase (Q) components into the phase and amplitude components at a first sampling rate. Additionally, a second conversion is provided for converting the phase component into a frequency component, wherein the second conversion comprises a rate conversion for converting the first sampling rate into a lower second sampling rate at which the frequency component is provided. Thereby, the second sampling rate can be used as a lower update rate in a digitally controlled oscillator in order to save power or because of speed limitations, while the surplus phase samples obtain due to the higher first sampling rate enable better approximation of the phase component after the digitally controlled oscillator. This better approximation accounts for a cleaner spectrum around the synthesized channel.

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Sander, W.B., et al; “Polar Modulator for Multi-Mode Cell Phones”; Proceeding Fo the IEEE 2003 Custom Integrated Circuits Conference; vol. Conf. 23; Sep. 21, 2003; pp. 439-446; IEEE New York, NY, USA; ISBN: 0-7803-7842-3; XP010671064.

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