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\section{Non-Orthogonal Multiple-Access: NOMA}  We consider the system model with one base station ${\sf B}$ and $N$ downlink users ${\sf U}_1, \ldots, {\sf U}_N$; all terminals are equipped with a single antenna. In the traditional orthogonal multiple access methodology, $\sf B$ serves only one users at any time slot.  Hey, welcome. Double click anywhere on the text to start writing. In addition to simple text you can also add text formatted in \textbf{boldface}, \textit{italic}, and yes, math too: $E = mc^{2}$! Add images by drag'n'drop or click on the "Insert Figure" button.