Aiming Perfectly in the Dark - Blind Interference Alignment through Staggered Antenna Switching

Abstract

We propose a blind interference alignment scheme for the vector broadcast channel where the transmitter is equipped with M antennas and there are K receivers, each equipped with a reconfigurable antenna capable of switching among M preset modes. Without any knowledge of the channel coefficient values at the transmitters and with only mild assumptions on the channel coherence structure we show that MK/M+K-1 degrees of freedom are achievable. The key to the blind interference alignment scheme is the ability of the receivers to switch between reconfigurable antenna modes to create short term channel fluctuation patterns that are exploited by the transmitter. The achievable scheme does not require cooperation between transmit antennas and is therefore applicable to the MxK X network as well. Only finite symbol extensions are used, and no channel knowledge at the receivers is required to null the interference.

27 pages, 15 figures

References in corpus (4)

• On the "degrees of freedom" of the lasso
• On the Degrees of Freedom of the Compound MIMO Broadcast Channels with Finite States
• Ergodic Interference Alignment
• On the Degrees of Freedom of Finite State Compound Wireless Networks - Settling a Conjecture by Weingarten et. al

Cited by in corpus (6)

• Retrospective Interference Alignment
• The Degrees of Freedom Regions of Two-User and Certain Three-User MIMO Broadcast Channels with Delayed CSIT
• Joint Spatial Division and Multiplexing
• Linear Degrees of Freedom of MIMO Broadcast Channels with Reconfigurable Antennas in the Absence of CSIT
• Interference Alignment for the Multi-Antenna Compound Wiretap Channel
• Two-User Interference Channels with Local Views: On Capacity Regions of TDM-Dominating Policies