Open AccessInterference alignment in space, time and frequency: achievable DoF analysis
Author(s) -
Falahati A.,
Akbari M.
Publication year - 2016
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2015.3541
Subject(s) - interference (communication) , interference alignment , channel (broadcasting) , co channel interference , single antenna interference cancellation , adjacent channel interference , control theory (sociology) , computer science , degrees of freedom (physics and chemistry) , zero forcing precoding , topology (electrical circuits) , scheme (mathematics) , space (punctuation) , electronic engineering , mimo , telecommunications , mathematics , physics , engineering , precoding , electrical engineering , control (management) , artificial intelligence , operating system , mathematical analysis , quantum mechanics
It is well established that the employment of interference alignment (IA) in the interference channel can enhance the achievable degrees of freedom (DOF) significantly. The feasibility of IA in a multi‐carrier time‐extended interference channel is considered. A new IA scheme is introduced that jointly performs the alignment over space, time and frequency. An asymmetric case is considered where the users are equipped with a different number of transmit/receive antennas. In the wake of this asymmetry, the feasible DoF of each user can be different. A closed‐form necessary condition on the feasibility of asymmetric achievable DoF in the proposed scheme is derived.