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This paper aims to realize a new multiple access technique based on recentlyproposed millimeter-wave reconfigurable antenna architectures. To this end,first we show that integration of the existing reconfigurable antenna systemswith the well-known non-orthogonal multiple access (NOMA) technique causes asignificant degradation in sum rate due to the inevitable power division inreconfigurable antennas. To circumvent this fundamental limit, a new multipleaccess technique is proposed. The technique which is called reconfigurableantenna multiple access (RAMA) transmits only each user's intended signal atthe same time/frequency/code, which makes RAMA an inter-user interference-freetechnique. Two different cases are considered, i.e., RAMA with partial and fullchannel state information (CSI). In the first case, CSI is not required andonly the direction of arrival for a specific user is used. Our analyticalresults indicate that with partial CSI and for symmetric channels, RAMAoutperforms NOMA in terms of sum rate. Further, the analytical result indicatesthat RAMA for asymmetric channels achieves better sum rate than NOMA when lesspower is assigned to users that experience better channel quality. In thesecond case, RAMA with full CSI allocates optimal power to each user whichleads to higher achievable rates compared to NOMA for both symmetric andasymmetric channels. The numerical computations demonstrate the analyticalfindings.

Reconfigurable Antenna Multiple Access for 5G mmWave Systems