Interference Cancellation trough Interference Alignment for Downlink of Cognitive Cellular Networks

TL;DR

This paper proposes an interference alignment technique for cognitive cellular networks' downlink, enhancing interference cancellation, degrees of freedom, and sum rate performance through optimal power allocation.

Contribution

It introduces a novel interference cancellation method using interference alignment specifically for cognitive cellular networks' downlink.

Findings

Achieves higher degrees of freedom with interference alignment.

Provides analytical derivation of achievable sum rates.

Demonstrates improved interference management in cognitive networks.

Abstract

In this letter, we propose the interference cancellation through interference alignment at the downlink of cognitive cellular networks. Interference alignment helps the spatial resources to be shared among primary and secondary cells and thus, it can provide higher degrees of freedom through interference cancellation. We derive and depict the achievable degrees of freedom. We also analyse and calculate the achievable sum rates applying water-filling optimal power allocation.