8PSK modulator

Pulse or digital communications – Transmitters – Angle modulation

Reexamination Certificate

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Reexamination Certificate

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07916808

ABSTRACT:
A modulation circuit uses pre-calculated and stored data to generate the modulated output. The modulator architecture uses pre-calculated, Gaussian filtered sine and cosine responses that are stored in a ROM (read-only memory) or other memory structure. The modulator output is then calculated as a simple sum of values read from the ROM and controlled by the input burst data stream.

REFERENCES:
patent: 4833479 (1989-05-01), Carlson
patent: 5285479 (1994-02-01), Iwane
patent: 5425055 (1995-06-01), Blaker
patent: 2003/0008626 (2003-01-01), Miyano et al.
patent: 2005/0025256 (2005-02-01), Van De Beek et al.
patent: 2009/0227210 (2009-09-01), Mak et al.

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