Title:
【発明の名称】広帯域通信システム用の群変調器
Document Type and Number:
Japanese Patent JPH11509057
Kind Code:
A
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.
Inventors:
Boraz Jani, Ramin
Kevin Lee, Miller
Kevin Lee, Miller
Application Number:
JP50522197A
Publication Date:
August 03, 1999
Filing Date:
June 28, 1996
Export Citation:
Assignee:
SCIENTIFIC-ATLANTA INCORPORATED
International Classes:
H04H20/46; H04H20/78; H04H60/94; H04H60/97; H04J1/00; H04J4/00; H04L5/02; H04L12/28; H04L27/18; H04L27/26; H04N7/10; (IPC1-7): H04J1/00; H04B10/20; H04L5/02; H04L27/18; H04N7/16
Attorney, Agent or Firm:
Kazuo Shamoto (5 outside)