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Conditions are derived on line-of-sight channels to ensure the feasibility ofinterference alignment. The conditions involve choosing only the spacingbetween two subcarriers of an orthogonal frequency division multiplexing (OFDM)scheme. The maximal degrees-of-freedom are achieved and even an upper bound onthe sum-rate of interference alignment is approached arbitrarily closely.

Feasibility Conditions of Interference Alignment via Two Orthogonal Subcarriers