Resource Allocation for mmWave-NOMA Communication through Multiple Access Points Considering Human Blockages

• Main Authors: Barghikar, Foad, Tabataba, Foroogh S, Soorki, Mehdi Naderi
• Format: Journal Article
• Language: English
• Published: 27-05-2020
• DOI: 10.48550/arxiv.2005.13182

In this paper, a new framework for optimizing the resource allocation in a
millimeter-wave-non-orthogonal multiple access (mmWave-NOMA) communication for
crowded venues is proposed. MmWave communications suffer from severe blockage
caused by obstacles such as the human body, especially in a dense region. Thus,
a detailed method for modeling the blockage events in the in-venue scenarios is
introduced. Also, several mmWave access points are considered in different
locations. To maximize the network sum rate, the resource allocation problem is
formulated as a mixed integer non-linear programming, which is NP-hard in
general. Hence, a three-stage low-complex solution is proposed to solve the
problem. At first, a user scheduling algorithm, i.e., modified worst connection
swapping (MWCS), is proposed. Secondly, the antenna allocation problem is
solved using the simulated annealing algorithm. Afterward, to maximize the
network sum rate and guarantee the quality of service constraints, a non-convex
power allocation optimization problem is solved by adopting the difference of
convex programming approach. The simulation results show that, under the
blockage effect, the proposed mmWave-NOMA scheme performs on average 23% better
than the conventional mmWave-orthogonal multiple access scheme. Moreover, the
performance of proposed solution is 11.4% lower than the optimal value while
reducing complexity by 96%.