Degrees of Freedom of Wireless X Networks

Abstract— We study the degrees of freedom characterization of wireless X networks, i.e. networks of M distributed single antenna transmitters and N distributed single antenna receivers where every transmitter has an independent message to every receiver. We provide an outerbound on the capacity region of X networks within o(log(SNR)). If the channel co-efficients are time-varying/frequency selective, we show that the total number of degrees of freedom is equal to MN M+N−1 using a coding scheme based on the idea of interference alignment.

• Type: Journal
• Year: 2007
• Where: CORR
• Authors: Viveck R. Cadambe, Syed Ali Jafar
• Keywords: CORR 2007, Education, Single Antenna, Single Antenna Receivers, Single Antenna Transmitters