Retrospective Interference Alignment

Abstract

We explore similarities and differences in recent works on blind interference alignment under different models such as staggered block fading model and the delayed CSIT model. In particular we explore the possibility of achieving interference alignment with delayed CSIT when the transmitters are distributed. Our main contribution is an interference alignment scheme, called retrospective interference alignment in this work, that is specialized to settings with distributed transmitters. With this scheme we show that the 2 user X channel with only delayed channel state information at the transmitters can achieve 8/7 DoF, while the interference channel with 3 users is able to achieve 9/8 DoF. We also consider another setting where delayed channel output feedback is available to transmitters. In this setting the X channel and the 3 user interference channel are shown to achieve 4/3 and 6/5 DoF, respectively.

References in corpus (3)

• On the Capacity of Fading MIMO Broadcast Channels with Imperfect Transmitter Side-Information
• Aiming Perfectly in the Dark - Blind Interference Alignment through Staggered Antenna Switching
• Error Exponents for the Gaussian Channel with Active Noisy Feedback

Cited by in corpus (11)

• Capacity Results for Binary Fading Interference Channels with Delayed CSIT
• Interference Alignment for the MIMO Interference Channel with Delayed Local CSIT
• Communication Through Collisions: Opportunistic Utilization of Past Receptions
• The Degrees of Freedom Regions of Two-User and Certain Three-User MIMO Broadcast Channels with Delayed CSIT
• The Degrees of Freedom Region and Interference Alignment for the MIMO Interference Channel with Delayed CSI
• Ergodic Interference Alignment
• Broadcast Channels with Delayed Finite-Rate Feedback: Predict or Observe?
• The Degrees of Freedom Region of the MIMO Interference Channel with Shannon Feedback
• The Degrees of Freedom of the 2-Hop, 2-User Interference Channel with Feedback
• Spatial Intercell Interference Cancellation with CSI Training and Feedback
• Secrecy Degrees of Freedom of MIMO Broadcast Channels with Delayed CSIT