Title :
Development of variable-rate digital modem for digital satellite communication systems
Author :
Otani, Susumu ; Tanimoto, Yuta ; Iwasaki, Motoya ; Makita, Fumio ; Kobayashi, Hideo ; Eguchi, Kuniharu ; Masuda, Mitsuru
Author_Institution :
NEC Corp., Yokohama, Japan
fDate :
28 Nov-1 Dec 1988
Abstract :
The authors present the configuration of a continuously variable-rate digital modem that has been developed using a digital signal processing technology based on custom LSIs. The modem covers the operating baud rate range from 40 Kbauds to 6 Mbauds, and the bit error rate degradation for any baud rate is within 0.5 dB of the theoretical value. Seven custom-designed LSIs have been developed for the modem to realize a compact construction unit and low power consumption. The selection of the cutoff frequency of pre- and postfilters is discussed
Keywords :
digital communication systems; large scale integration; modems; satellite relay systems; bit error rate; custom LSIs; cutoff frequency; digital satellite communication systems; digital signal processing; postfilters; prefilter; variable-rate digital modem; Circuits; Clocks; Decoding; Digital filters; Frequency conversion; Frequency synthesizers; Large scale integration; Modems; Satellite communication; Transversal filters;
Conference_Titel :
Global Telecommunications Conference, 1988, and Exhibition. 'Communications for the Information Age.' Conference Record, GLOBECOM '88., IEEE
Conference_Location :
Hollywood, FL
DOI :
10.1109/GLOCOM.1988.25827
