Compatibility analysis between cognitive radio and DVB-T system

Since IEEE802.22 is required to reuse the fallow TV spectrum without causing harmful interference to the incumbents (i.e., the TV receivers), Cognitive Radio (CR) techniques are of great importance to get access to the TV bands opportunistically. Meanwhile, the opportunistic spectrum access (OSA) model provides an approach to allow the compatibility between low-power cognitive devices and the incumbents on certain geographical regions. In order to offer a technical guidance for the future CR network construction, British Telecom's (BT) mobility research center concentrates their works on measuring and analyzing the interactive interference between CR transmitters and DVB-T (digital video broadcasting-terrestrial) receivers in the mainland of the UK. In this paper, we show the preliminary research result. Based on the ITU-R REC.P.370 radiowave propagation model and report of DVB-T system from European Radiocommunications Committee (ERC), we establish a compatibility scenario in OXFORD, modify the propagation model and simulate the scenario in MATLAB to obtain the interference power at DVB-T receivers on different operating frequencies and different locations within the coverage. In addition, we also present the safe distance that CR users should keep away from DVB-T receivers as a function of frequency difference in the simulation results.