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Rate adaptation schemes for other single-user networks (such as MIMO networks and amplify-and-forward relay networks) can be designed in a similar way.  \subsection{Challenges for Rate Adaptation for Multiuser Networks with Limited Feedback}  Rate adaptation for multiuser networks (such as multiple-access networks, decode-and-forward relay networks)  \section{Power Allocation for Non-Orthogonal Multiple-Access (NOMA) Systems with Limited Feedback}  In the future 5G communication systems, a promising downlink multiple access scheme is the non-orthogonal multiple access (NOMA) which achieves high spectral efficiencies by combining superposition coding at the transmitter with successive