Joint antenna selection for MIMO-NOMA networks over Nakagami-m fading channels

摘要

In this paper, a two-user multiple-input multiple-output non-orthogonal multiple access (MIMO-NOMA) network is analyzed. A joint antenna selection (JAS) scheme, which determines the best transmit antenna at the source node and the optimal antenna at the two users is proposed to minimize the outage probability. The exact expression for the outage probability is derived in closed-form. Meanwhile, the asymptotic outage expression in high signal-to-noise ratio (SNR) regime is also obtained to illustrate the diversity order of the proposed JAS scheme. Finally, numerical results demonstrate the correctness of theoretical analysis and the superiority of the proposed JAS scheme over the max-min-max antenna selection(AIA-AS) and the max-max-max antenna selection(A3-AS) schemes. Compared with conventional orthogonal multiple access (OMA), NOMA can achieve a better outage performance and higher spectrum utilization.