Anomalous Radio Propagation Problems in Terrestrial Digital Television Broadcastings

Abstract

It is known that VHF- and UHF-band radio waves propagate over a longer distance than usual, when subjected to atmospheric ducting, which occurs under certain weather conditions. Anomalous overreach propagation causes co-channel interference in wireless systems such as terrestrial digital TV broadcasting systems. For digital TV systems, it has been difficult to take countermeasures against overreach interference since it is difficult to identify sources of interference. This review explains the anomalous propagation caused by atmospheric ducting and describes new countermeasures employed in digital TV systems.