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Cognitive Interference Alignment for OFDM Two-Tiered Networks

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Executive Summary

In this paper, the authors introduce an interference alignment scheme that allows the coexistence of an Orthogonal Frequency Division Multiplexing (OFDM) macro-cell and a cognitive small-cell, deployed in a two-tiered structure and transmitting over the same bandwidth. They derive the optimal linear strategy for the single antenna secondary base station, maximizing the spectral efficiency of the opportunistic link, accounting for both signal sub-space structure and power loading strategy. Their analytical and numerical findings prove that the pre-coder structure proposed is optimal for the considered scenario in the face of Rayleigh and exponential decaying channels.

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