Unit 5 Agression Paper

After collection of enough spectrum sensing results from each secondary user by the FC as above, relation is determined in the spectrum sensing results of each SU to identify both OMU and ROMU with the abnormal sensing reports to the fusion centre using the following steps. Variation in the Sensing results
In the first step, FC measure the differences in the sensing results provided by each individual SU with all other SUs, during each sensing interval from initial to N_0 interval. Here sensing results of all other SUs is taken while ignoring sensing results provided by the j^th SU in the i^th interval. This make clear how the combine sensing results is affected due to the j^th SU decision, by neglecting the j^th SU result in the i^th sensing interval to find out the impact of not including this particular user in the combine sensing result. Similar sensing results for all other SUs during each of the N_0 sensing interval is made as
V_ij=[m_ij] where m_ij={((∑_(j=1)^M▒z_(i,j) )-z_ij)/(M-1)} (12) …show more content…
Value for m_ij is calculated as the collective energy reports of other SUs in the i^th sensing interval while ignoring the sensing results of the j^th SU. The result obtained in Equation (12) for both OMU and ROMU users have a different response than normal SUs due to the difference in their sensing information. Taking these MUs out of the average value during each sensing interval is generating different results for these MUs against normal SUs. Now difference in the sensing results of each individual SU Z_ij is made with the average sensing information m_ij delivered by all other SUs as