Title :
Novel satellite digital video TDMA system for business video communications
Author :
Kubota, Shuji ; Kazama, Hiroshi ; Morikura, Masahiro ; Kato, Shuzo
Author_Institution :
NTT Radio Commun. Syst. Lab., Yokosuka, Japan
Abstract :
The authors propose an integrated satellite digital video system for business video communications which realizes multipoint to multipoint dynamic channel assignment, simultaneous plural video signal transmission, and efficient use of the transponder transmission power. An offset quadrature phase shift keying (QPSK) modulation scheme with a high-coding-gain high-coding-rate forward error correction scheme obtains compact spectrum characteristics and highly interference-resistant characteristics in nonlinear satellite channels. For backward voice channel transmission from video signal receive-only terminals, a superposed spread spectrum multiple access voice signal transmission scheme over a time division multiple access video signal through one transponder that employs a cochannel interference cancellation technique is proposed
Keywords :
digital radio systems; interference suppression; phase shift keying; radiofrequency interference; satellite relay systems; spread spectrum communication; telecommunication channels; teleconferencing; time division multiple access; videotelephony; visual communication; voice communication; QPSK; backward voice channel transmission; business video communications; cochannel interference cancellation technique; compact spectrum characteristics; high-coding-gain high-coding-rate forward error correction scheme; highly interference-resistant characteristics; integrated satellite digital video system; multipoint to multipoint dynamic channel assignment; nonlinear satellite channels; offset quadrature phase shift keying; simultaneous plural video signal transmission; superposed spread spectrum multiple access voice signal transmission scheme; time division multiple access video signal; transponder transmission power; video signal receive-only terminals; videotelephony; Artificial satellites; Business communication; Forward error correction; Interference; Nonlinear dynamical systems; Phase modulation; Quadrature phase shift keying; Spread spectrum communication; Time division multiple access; Transponders;
Conference_Titel :
Communications, 1992. ICC '92, Conference record, SUPERCOMM/ICC '92, Discovering a New World of Communications., IEEE International Conference on
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-0599-X
DOI :
10.1109/ICC.1992.268022
