This paper describes a nonorthogonal multiple access (NOMA)-based device-to-device
(D2D) communication system underlaying in a cellular network sharing time and frequency
resource. To optimize the total transmit power for all users in the network, we investigate a
comprehensive resource allocation solution consisting of joint subchannel assignments,
user pairings, and power control. The optimization problem is a mixed integer linear
program, which is solved in three low-complexity steps. We first group D2D users to …

This chapter considers coexistence between the nonorthogonal multiplexing access
(NOMA) device‐to‐device (D2D) downlink system and the uplink cellular system extending
the centralized models developed in literature. D2D communications can potentially
facilitate peer‐to‐peer services. Considering the potentials of D2D and NOMA, it is essential
to explore whether NOMA can be combined with D2D communication systems to maximize
efficiency. The chapter proposes an effective subchannel allocation and user pairing method …