In a cognitive radio network, a primary user (PU) shares its spectrum with secondary users (SUs) temporally and spatially, while allowing for some interference. Consider the problem of estimating the no-talk region of the PU, i.e., the region outside which SUs may utilize the PU’s spectrum regardless of whether the PU is transmitting or not. And propose a adaptive boundary estimation algorithm ...

Introduction Spectral spatial (SPSP) RF pulses are simultaneously selective in both the spectral and spatial domains [1]. SPSP pulses consist of a train of slice selective RF subpulses applied simultaneously with an oscillating slice select gradient. When used for spatially selective water or fat excitation, the difference in frequency between water and fat, ∆ , limits the spacing between RF su...