Abstract

In the present wireless scenario, nonorthogonal multiple access (NOMA) and multiple-input multiple-output (MIMO) aims to achieve substantially improved spectrum efficiency and high performance. In this paper, we analyze the outage and sum-rate performance of MIMO- NOMA using fair and improved fair power allocation (PA) and compare it with MIMO-orthogonal multiple access (OMA). Also, we evaluate system performance over Nakagami-m fading scenario. The weak user is given priority while computing the power coefficient for fair PA. To meet the weak user’s target rate, the PA coefficients are computed. We observe that the outage probability steadily increases with the increase in weak user’s target rate in fair PA. The likelihood of a weak user reaching the target rate decreases as the target rate rises. Moreover, we make minor alterations to improve efficacy and minimize outages for strong users using improved fair PA. Simulation results show that MIMO-NOMA delivers lesser outages and larger sum rate for both the users using improved PA than MIMO-OMA in Nakagami- m fading.

Authors

Keerti Tiwari
Capgemini Engineering, Bangalore, India

Keywords

Multiple-Input Multiple-Output, Nonorthogonal Multiple Access, Improved Fair Power Allocation, Nakagami-M Fading