On Achievable Schemes of Interference Alignment with Double-Layered Symbol Extensions in Interference Channel

TL;DR

This paper explores interference alignment in K-user interference channels using double-layered symbol extensions to create effective time-variant channels, enabling improved alignment strategies for constant or slowly changing channels.

Contribution

It introduces a novel application of double-layered symbol extensions to simulate channel variability, facilitating interference alignment in scenarios with limited channel dynamics.

Findings

Double-layered symbol extensions enable interference alignment in constant channels.

The method constructs equivalent time-variant channels for better alignment.

Improves achievable degrees of freedom in interference channels.

Abstract

This paper looks into the $K$-user interference channel. Interference Alignment is much likely to be applied with double-layered symbol extensions, either for constant channels in the H$\o$st-Madsen-Nosratinia conjecture or slowly changing channels. In our work, the core idea relies on double-layered symbol extensions to artificially construct equivalent time-variant channels to provide crucial \textit{channel randomness or relativity} required by conventional Cadambe-Jafar scheme in time-variant channels \cite{IA-DOF-Kuser-Interference}.