Example problematic scenarios. The primary network transmission will be intercepted by the secondary transmission initiated due to a miss-predicted spectral opportunity as shown in Figure 1a. Meanwhile, the secondary user misses a spectral opportunity because of the misleading interference measurement as depicted in Figure 1b. a Hidden primary sender scenario; b Exposed primary sender scenario.
Khattab et al. EURASIP Journal on Wireless Communications and Networking 2011 2011:188 doi:10.1186/1687-1499-2011-188