Title :
Trial application of spread spectrum technologies to hierarchical digital broadcasting
Author :
Hamazumi, Hiroyuki ; Ito, Yasuhiro ; Shogen, Kazuyoshi ; Miyazawa, Hiroshi
Author_Institution :
NHK Sci. & Tech. Res. Labs., Tokyo, Japan
Abstract :
This paper describes two advanced hierarchical digital transmission systems using SS (spread spectrum) technology in order to improve the breakdown characteristics of digital transmission. One is AW-CDM (adaptively weighted code division multiplexing) hierarchical digital transmission system for terrestrial digital broadcasting, which enables one to use mobile/portable receiver as well as fixed receiver. The other is TDM-SS (time division multiplexing using spread spectrum) hierarchical digital transmission system for Ka-band satellite broadcasting, which enables one to receive limited but continuous service even in heavy rain attenuation. Through simulations and experiments using prototype models, some of their features have been verified
Keywords :
adaptive systems; digital television; direct broadcasting by satellite; electromagnetic wave absorption; mobile radio; pseudonoise codes; radio receivers; rain; spread spectrum communication; television broadcasting; time division multiplexing; tropospheric electromagnetic wave propagation; AW-CDM; DBS; DS-SS; Ka-band satellite broadcasting; TDM-SS; adaptively weighted code division multiplexing; breakdown characteristics; direct sequence spread spectrum; experiments; fixed receiver; hierarchical digital broadcasting; hierarchical digital transmission systems; mobile/portable receiver; prototype models; rain attenuation; simulations; spread spectrum technologies; terrestrial digital broadcasting; time division multiplexing; Bandwidth; Broadcast technology; Degradation; Electric breakdown; OFDM; Satellite broadcasting; Signal processing; Spread spectrum communication; TV broadcasting; Video compression;
Conference_Titel :
Spread Spectrum Techniques and Applications Proceedings, 1996., IEEE 4th International Symposium on
Conference_Location :
Mainz
Print_ISBN :
0-7803-3567-8
DOI :
10.1109/ISSSTA.1996.563229
