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

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$\text{o}$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 $\mathit{\text{channel}}\mathit{\text{randomness}}\mathit{\text{or}}\mathit{\text{relativity}}$ required by conventional Cadambe-Jafar scheme in time-variant channels \cite{IA-DOF-Kuser-Interference}.