(n, K)-user interference channels: Degrees of freedom

The gains of opportunistic communication in multiuser interference channels is analyzed. Consider a network of fully connected n-user Gaussian interference channel that afford activating K ≤ n at-a-time. It is shown that when n obeys certain scaling laws, by opportunistically and dynamically selecting the K active pairs the number of degrees of freedom can exceed K/2 and, in fact, can be made arbitrarily close to K. More specifically the network size scaling as n ∈ ω (SNR^d(K-1)) is a sufficient condition for achieving d ∈ [0, K] degrees of freedom.