Cognitive radio (CR) systems are designed to utilize the available radio spectrum in an efficient and intelligent manner. Terrestrial\nDigital Video Broadcasting (DVB-T) frequency bands are one of the future candidates for cognitive radio applications especially\nbecause after digital television transition the TV white spaces (TVWS) became available for radio communication. This paper\ndeals with the survey of the DVB-T spectrum; wideband measurements were performed on mobile platform in order to study\nthe variation of the radio signal power in city area aboard a moving vehicle.The measurement environment was a densely built-in\nregionwhere the properDVB-T receiving was guaranteed by three TVtransmitters, utilizing three central channel frequencies using\n610, 746, and 770MHz. In our paper the methods, the applied antenna, and measurement devices will be presented together with\nsimulated andmeasured fading statistics.Thefinal result is an estimation of the cognitive DVB-T spectrumutilization opportunity;\nfurthermore a scenario is also proposed for secondary channel usage.
Loading....