DocumentCode :
1062506
Title :
A PSK Group Modem for Satellite Communications
Author :
Takahata, Fumio ; Yasunaga, Masayuki ; Hirata, Yasuo ; Ohsawa, Tomoki ; Namiki, Junji
Author_Institution :
Kokusai Denshin Denwa Res. and Dev. Labs., Japan
Volume :
5
Issue :
4
fYear :
1987
fDate :
5/1/1987 12:00:00 AM
Firstpage :
648
Lastpage :
661
Abstract :
A PSK group modem which modulates and demodulates multiple PSK signals en bloc will play an important role in realizing a cost-effective satellite communications system based on the narrowband multicarrier PSK/FDMA technique. This paper briefly discusses its possible applications, and presents a developed PSK group modem including its algorithm, hardware design, and implementation. In the algorithm, filtering of respective PSK signals is effectively carried out by digital signal processing techniques applied to the digital transmultiplexer. Furthermore, in order to compensate for the difference between the operation timing of the PSK group modem and the symbol timing of each input/output data signal, digital signal processings based on a table-look-up method using ROM and a rate-conversion filter with adaptive weighting are proposed for the modulator and demodulator, respectively. An experimental 4-phase PSK group modem has been developed, and experiments have been conducted under various conditions. The measured performance of the developed hardware is also demonstrated.
Keywords :
Phase-shift keying; Satellite communication, onboard systems; Transmultiplexing; Digital filters; Digital signal processing; Hardware; Modems; Narrowband; Phase shift keying; Satellite communication; Signal processing; Signal processing algorithms; Timing;
fLanguage :
English
Journal_Title :
Selected Areas in Communications, IEEE Journal on
Publisher :
ieee
ISSN :
0733-8716
Type :
jour
DOI :
10.1109/JSAC.1987.1146585
Filename :
1146585
Link To Document :
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