Baseband signal generator for digital modulator

Details Baseband signal generator for digital modulator Baseband signal generator for digital modulator

1992-10-30

1995-01-03

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 54, 332103, H04L 2710

Patent

active

053793226

ABSTRACT:
A baseband signal generator according to the present invention performs differential encoding and mapping processings for a digital baseband signal and limits bandwidths of the obtained symbol mapping data of an I phase and a Q phase by digital filters. Each digital filter includes a circuit for accumulating symbol mapping data corresponding to a plurality of symbol sections, a plurality of ROMs provided corresponding to the plurality of symbol sections for storing symbol data corresponding to a predetermined filter waveform, and an adder for adding symbol data output from there ROMs. The adder outputs a digital baseband signal whose bandwidth is limited, which signal is converted into an analog baseband signal by a D/A converter and supplied to an analog modulation unit.

REFERENCES:
patent: 5175514 (1992-12-01), Iinuma et al.
patent: 5177769 (1993-01-01), Arnold et al.
patent: 5260973 (1993-11-01), Watanabe

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