Abstract-For the fully connected K user wireless interference channel where the channel coefficients are time-varying and are drawn from a continuous distribution, the sum capacity is characterized as C(SNR) = K 2 log(SNR) + o(log(SNR)). Thus, the K user time-varying interference channel almost surely has K=2 degrees of freedom. Achievability is based on the idea of interference alignment. Examples are also provided of fully connected K user interference channels with constant (not time-varying) coefficients where the capacity is exactly achieved by interference alignment at all SNR values. Index Terms-Capacity, degrees of freedom, interference alignment, interference channel, multiple-input-multiple-output (MIMO), multiplexing.
In seminal work REF , interference alignment has been proposed to achieve the optimal DoF of the K-user interference channel with time-varying channel coefficients.
Interference Alignment and Degrees of Freedom of the $K$-User Interference Channel
IEEE Transactions on Information Theory
IEEE Transactions on Information Theory
Mathematics Computer Science