Title :
Robust digital signal compression and modulation exploiting the advantages of analog communications
Author :
Lervik, John M. ; Grøvlen, Asbjørn ; Ramstad, Tor A.
Author_Institution :
Dept. of Telecommun., Norwegian Inst. of Technol., Trondheim, Norway
Abstract :
A visual communication system for power- and bandwidth-limited channels, which gracefully degrades as the channel deteriorates is presented. The system is based on joint optimization of subband coding and 81-QAM through robust mappings between the source coder space and the modulation space. A novel definition for measuring system efficiency, based on a comparison to pure analog transmission, is used to evaluate the proposed system. The ideas presented in this paper can be used for terrestrial digital TV broadcasting or mobile communications
Keywords :
data compression; digital television; image coding; land mobile radio; modulation coding; quadrature amplitude modulation; telecommunication channels; television broadcasting; visual communication; 81-QAM; analog communications; analog transmission; bandwidth limited channels; digital signal compression; digital signal modulation; image coding; joint optimization; mobile communications; modulation space; power limited channels; robust mappings; source coder space; subband coding; system efficiency measurement; terrestrial digital TV broadcasting; visual communication system; Bandwidth; Codecs; Degradation; Digital modulation; Digital video broadcasting; Image coding; Mobile communication; Radio transmitters; Robustness; Standards development;
Conference_Titel :
Global Telecommunications Conference, 1995. GLOBECOM '95., IEEE
Print_ISBN :
0-7803-2509-5
DOI :
10.1109/GLOCOM.1995.502564
