Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1988-04-08
1989-06-27
Grimm, Siegfried H.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
332 23R, 375 57, 375 60, 375 67, H04L 2720
Patent
active
048433527
ABSTRACT:
A modulator for generating a burst-like modulated wave used in a multi-carrier transmission type communication system in which a plurality of modulated waves including at least one burst-like modulated wave exist on the same transmission line and the frequency band occupied by energy of each of the plurality of modulated waves is limited. Polarities of the transmission code which appear before and after either of on-timing and off-timing of the carrier on/off switched to obtain the burst-like modulated wave among the plurality of modulated waves are inverted to each other, whereby the envelope of the burst-like modulated wve can be changed gradually at the carrier on/off timing in order to reduce the interference of the modulated wave with the adjacent channels without degrading the transmission efficiency.
REFERENCES:
patent: 4485478 (1984-11-01), Takada
patent: 4706262 (1987-11-01), Ohta
patent: 4756008 (1988-07-01), Yagi et al.
Barert et al, "A QPSK Modem Designed for 120 Mb/s TDMA Transmissions with a 70 MHz Intermediate Frequency", Fourth International Conference on Digital Satellite Communications, Oct. 23-25, 1978, Montreal, Canada, p. 139, IEEE Catalog No. 78CH1326-8.
"An Approach for the Design of a TDMA Burst Modem Operating in a Highly Nonlinear Satellite Channel", p. 102.
Feher, Digital Communications Satellite/Earth Station Engineering Prentice-Hall Inc., N.J., 1981, pp. 367-369.
Boutin et al, "Analysis and Design of a ROM Synthesizer as an Optimum Digital Transmit Filter", pp. 87-90 Intelsat/Tece/TIE Third International Conference on Digital Satellite Communications, Nov. 11-13, 1975, Kyoto, Japan.
Takahashi et al, "Experimental System for Computer Network VIA Satellite" Review of the Radio Research Laboratories vol. 28, No. 145, Mar. 1982, pp. 31-38.
Kamisaka Tadayuki
Nakamura Shigeki
Takahashi Yasufumi
Yagi Kazuo
Grimm Siegfried H.
Hitachi , Ltd.
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