Spatial variation of mobile DTV signals in Singapore

Singapore has launched mobile DVB-T (COFDM 2K) on an SBS bus service. The central frequency of transmission is 602 MHz and it has 8 MHz bandwidth. An experimental campaign is undertaken in 48 sectors to study the location variation of the DTV signals and the results are compared with the ITU-R values. Measurements carried out in 48 sectors confirm that the results are in close agreement with the ITU-R recommendations in some sectors. However, in the majority of sectors, the standard deviations are much smaller than the recommended value. A relationship between the height of the buildings and standard deviation of signal variation has been proposed. These results will be very useful for DTV predictions in built-up areas as the ITU-R classification of urban and sub-urban conditions are different for different countries.