Interference Alignment and Degrees of Freedom of the K-User Interference Channel

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.

• Type: Journal
• Year: 2008
• Where: TIT
• Authors: Viveck R. Cadambe, Syed Ali Jafar
• Keywords: Interference Channels, TIT 2008, User Time-varying Interference, User Wireless Interference