The authors propose a satellite video signal transmission system that uses a time-division multiple-access (CDMA) scheme for digital video signal transmission and a code-division multiple-access (CDMA) scheme for voice signal transmission from a video-signal reception-only earth station (backward voice signal transmission). The adoption of a TDMA scheme makes it possible to transmit video signals from various places and to communicate in multipoint-to-(multi)point mode. For backward voice channel transmission from video-signal-reception-only earth stations, a superposed CDMA voice signal transmission over TDMA video signals by using the same transponder is proposed. The employment of high coding gain forward error correction and development of a cochannel interference cancellation technique have made it possible for the proposed system to transmit a practical number of voice channels. The performance of the proposed system has been experimentally evaluated and the results show the proposed scheme can transmit about 20 CDMA voice channels simultaneously.
|Number of pages||12|
|Journal||IEEE Journal on Selected Areas in Communications|
|Publication status||Published - 1992 Aug|
ASJC Scopus subject areas
- Computer Networks and Communications
- Electrical and Electronic Engineering