Desempenho do Sensoriamento Espectral com Múltiplas Antenas sob Sinais Correlacionados

In centralized cooperative spectrum sensing with decision fusion, secondary user terminals sense a radio frequency band, sending to a fusion center the local decisions made based on local test statistics. At the fusion center, the global decision on the occupation state of the sensed band is made based on the logical combination of the received local decisions. This article evaluates the performance of this class of spectrum sensing under the effect of correlation between the signals received by secondary terminals equipped with multiple antennas. Although it is known that the existence of correlation between signals received by such terminals can degrade the spectrum sensing performance, the results presented herein show that correlation can be beneficial at different levels, depending on the local test statistics used.