Digital modulator with Root-Nyquist filter

Details Digital modulator with Root-Nyquist filter Digital modulator with Root-Nyquist filter

1996-09-27

1998-08-18

Chin, Stephen

Pulse or digital communications

Transmitters

Antinoise or distortion

332123, 332124, 36472413, 36472416, H04K 102

Patent

active

057967822

ABSTRACT:
A digital modulator having a pulse shaping filter which generates and accumulates impulse responses including prior impulse responses and posterior impulse responses to perform a Root-Nyquist raised cosine filtering. The pulse shaping filter includes a dummy accumulation data memory storing dummy accumulation values of prior impulse responses required for initial data transmission. When several initial impulse responses are to be transmitted, for example, on power-up, the impulse responses corresponding to input digital data are generated and added to the dummy accumulation values of prior impulse responses. After the initial transmission, the impulse responses corresponding to input digital data are generated and transmitted without the help of the dummy accumulation values.

REFERENCES:
patent: 5379322 (1995-01-01), Kosaka et al.
patent: 5404378 (1995-04-01), Kimura
patent: 5487089 (1996-01-01), Misaizu et al.
patent: 5657353 (1997-08-01), Hatcher et al.

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