Ergodic Interference Alignment With Delayed Feedback

We propose new ergodic interference alignment techniques for K-user interference channels with delayed feedback. Two delayed feedback scenarios are considered - delayed channel information at transmitter (CIT) and delayed output feedback. It is proved that the proposed techniques achieve total 2K/(K+2) DoF which is higher than that by the retrospective interference alignment for the delayed feedback scenarios.

[1]  Shlomo Shamai,et al.  On Degrees of Freedom Region of MIMO Networks Without Channel State Information at Transmitters , 2012, IEEE Transactions on Information Theory.

[2]  Aria Nosratinia,et al.  The multiplexing gain of wireless networks , 2005, Proceedings. International Symposium on Information Theory, 2005. ISIT 2005..

[3]  Hua Wang,et al.  Gaussian Interference Channel Capacity to Within One Bit , 2007, IEEE Transactions on Information Theory.

[4]  Syed Ali Jafar,et al.  Interference Alignment and Degrees of Freedom of the $K$-User Interference Channel , 2008, IEEE Transactions on Information Theory.

[5]  Syed Ali Jafar,et al.  Blind Interference Alignment , 2012, IEEE Journal of Selected Topics in Signal Processing.

[6]  Laura Cottatellucci,et al.  Retrospective interference alignment for interference channels with delayed feedback , 2012, 2012 IEEE Wireless Communications and Networking Conference (WCNC).

[7]  Max H. M. Costa,et al.  The capacity region of the discrete memoryless interference channel with strong interference , 1987, IEEE Trans. Inf. Theory.

[8]  Shlomo Shamai,et al.  Retrospective interference alignment , 2010, 2011 IEEE International Symposium on Information Theory Proceedings.

[9]  Sriram Vishwanath,et al.  Ergodic Interference Alignment , 2009, IEEE Transactions on Information Theory.

[10]  Venugopal V. Veeravalli,et al.  Gaussian Interference Networks: Sum Capacity in the Low-Interference Regime and New Outer Bounds on the Capacity Region , 2008, IEEE Transactions on Information Theory.