Pulse or digital communications – Transmitters – Angle modulation
Patent
1995-06-30
1998-10-20
Pham, Chi H.
Pulse or digital communications
Transmitters
Angle modulation
375222, 332103, 332145, 370486, 370522, H04L 2720, H04J 100, H04H 108
Patent
active
058258299
ABSTRACT:
A multi-channel modulator for the transmission of telephony signals within a broadband communication system. An interpolation module generates processed I and Q signal components by upsampling filtered I and Q signal components. In turn, these processed I and Q signal components output by a filter are passed to a set of channel modulators. Each channel modulator accepts a pair of processed I and Q signal components and, in response, modulates a selected carrier signal with one of the telephony signals to produce a complex modulated signal. An adder module responds to the complex modulated signals by summing the real signal components to produce a real resultant signal, and to sum the imaginary components to produce an imaginary resultant signal. A digital-to-analog converter (DAC) module coverts the real resultant signal and the imaginary resultant signal, which are represented by digital data streams, to analog signals. A transmitter, responsive to the analog signals, transmits the modulated signals within a frequency band of the broadband communications network.
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Borazjani Ramin
Miller Kevin Lee
Barnhardt III Hubert J.
Gardner Kelly A.
Luther William
Massaroni Kenneth M.
Pham Chi H.
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