Pulse or digital communications – Transmitters – Quadrature amplitude modulation
Patent
1995-01-31
1998-02-10
Chin, Wellington
Pulse or digital communications
Transmitters
Quadrature amplitude modulation
375219, 375261, 455118, 332103, H04B 140
Patent
active
057177198
ABSTRACT:
A transmission-reception apparatus in a digital radio communication system for minimizing electrical interference within the apparatus by eliminating interference attributable to the use of different frequency generators. The transmission apparatus includes an antenna, a quadrature modulator for quadrature modulating first and second data to be input, an up-converter for increasing a frequency of the quadrature modulated signal to a transmission frequency band and then for supplying the resulting signal to the antenna, a reference frequency generator, a carrier frequency generator for generating a carrier frequency for modulation by being phase-locked with the reference frequency generator, and a frequency multiplier for generating a respective local oscillation frequency for up-conversion by multiplying the carrier frequency by a predetermined positive number. Up-conversion of the quadrature-modulated signal can be performed in a single stage or in a plurality of stages.
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Lee Jae-Min
Park Jae-Sun
Bushnell Esq. Robert E.
Chin Wellington
Corrielus Jean B.
Samsung Electronics Co,. Ltd.
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