2012/02/05 by Stefano Rini, Rini, Stefano, Carolin Huppert +1
Engineering · #Wireless Communication Security Techniques
paper · pdf · doi:10.48550/arxiv.1202.0977
In this paper the study of the cognitive interference channel with a common\nmessage, a variation of the classical cognitive interference channel in which\nthe cognitive message is decoded at both receivers. We derive the capacity for\nthe semideterministic channel in which the output at the cognitive decoder is a\ndeterministic function of the channel inputs. We also show capacity to within a\nconstant gap and a constant factor for the Gaussian channel in which the\noutputs are linear combinations of the channel inputs plus an additive Gaussian\nnoise term. Most of these results are shown using an interesting transmission\nscheme in which the cognitive message, decoded at both receivers, is also\npre-coded against the interference experienced at the cognitive decoder. The\npre-coding of the cognitive message does not allow the primary decoder to\nreconstruct the interfering signal. The cognitive message acts instead as a\nside information at the primary receiver when decoding its intended message.\n