Protection ratios and interference curves for broadcast and cognitive co-channel and adjacent channel operation

This paper presents an extended study of the performance of an 802.22 WRAN system operating into the same coverage range of a DTT receiver. We performed extended measurements for evaluating the protection of the existing broadcasting services. In order to evaluate the performance of DTT systems interfered by 802.22 transmission in their adjacent channels, the Picture Failure levels have been monitored for different operation modes of the 802.22 standard. The goal of the present study is to find the maximum transmission power level and bandwidth configuration of an 802.22 signal operating in the adjacent channels of an active DTT system that ensures the protection of the primary broadcast system. The results from the measurements performed in the various scenarios have been analyzed and conclusions have been drawn.