Title :
The effect of atmospheric duct on modern OFDM-based digital broadcasting systems
Author :
Oraizi, Homayoon ; Hosseinzadeh, Shahram
Author_Institution :
Dept. of Electr. Eng., Iran Univ. of Sci. & Technol., Tehran, Iran
Abstract :
The aim of this paper is to investigate the effect of atmospheric ducts on modern OFDM-based broadcasting systems in VHF, UHF and L bands. Full-wave parabolic equation method will be used for calculation of electromagnetic field strength in time domain. It will be shown that the effect of atmospheric duct on the delay of electromagnetic field is negligible in comparison with the guard interval of OFDM signal. However, the duct amplifies the strength of EM signal which causes interference effects on adjacent services and because of brick-wall properties of OFDM-based signals; it may cause harmful effects on adjacent services and reduce the frequency reuse distance. Finally, it will be shown that the duct affects the field at far distances. Consequently, the usages of low distributed power transmitters are recommended for radio coverage in the presence of ducts.
Keywords :
OFDM modulation; broadcasting; electromagnetic fields; electromagnetic wave propagation; field strength measurement; parabolic equations; EM signal; L bands; OFDM signal; UHF; VHF; atmospheric duct; brick-wall properties; electromagnetic field strength; frequency reuse distance; full-wave parabolic equation method; guard interval; interference effects; low distributed power transmitters; modern OFDM-based digital broadcasting systems; radio coverage; time domain; Bandwidth; Digital audio broadcasting; Digital video broadcasting; Ducts; Electromagnetic fields; Equations; Optical transmitters; Radio broadcasting; Radio transmitters; Video compression;
Conference_Titel :
Microwave Conference, 2003. 33rd European
Print_ISBN :
1-58053-834-7
DOI :
10.1109/EUMC.2003.1262998
