Method and apparatus for modifying amplitude of at least one sym

Details Method and apparatus for modifying amplitude of at least one sym Method and apparatus for modifying amplitude of at least one sym

1996-03-27

1998-08-18

Chin, Stephen

Pulse or digital communications

Transmitters

Quadrature amplitude modulation

375308, 332103, H04L 2736, H04L 2720

Patent

active

057967849

ABSTRACT:
In a modulator (300), a symbol weight determiner (301) determines a scaling factor (310) for at least one symbol (308). An integrator (303) and a complex symbol generator (305) operate to produce at least one complex symbol (314) based on the at least one symbol. The scaling factor (310) is used to scale the at least one complex symbol. In one embodiment, a scaler (307) comprises a gain-modifiable amplifier (609) and, in a second embodiment, the scaler comprises a gain-modifiable filter (809). When such a modulator is incorporated into an RF communication device (600, 800), the energy used to transmit any given symbol can be varied according to the relative importance of that symbol. Additionally, the overall received sensitivity of a communication, at a given signal strength, can be improved.

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