Abstract
This letter investigated a device-to-device (D2D) communication underlaying cellular system, where one wireless device (WD) can directly transmit information to two inner users under non-orthogonal multiple access (NOMA) protocol with low latency. Considering the user fairness and reliability, both users can adopt successive interference cancellation (SIC) to decode information by the given decoding order. Subject to predefined quality-of-service (QoS) requirement and the constraint of WD’s transmit power, the maximal rate of latter decoded information and the corresponding precoding vectors are obtained by applying the technique of semidefinite relaxation (SDR) and the Langrangian duality method. Then, the suboptimal scheme based on singular value decomposition (SVD) is also proposed with a lower computational complexity. Numerical simulation shows that with the design of proper precoding vectors D2D communication system assisted by NOMA has a better performance than orthogonal multiple access (OMA).
Highlights
Non-orthogonal multiple access (NOMA) is one of the promising multiple access to realize the challenging requirements of 5G [1, 2], such as massive connectivity, high data rate, and low latency
Many various NOMA designs combined with multiple-input multiple-output (MIMO) [5], cooperative relaying [6] and millimeter-wave communications [7], have appeared in recent researches
2 Method This paper considers the D2D communication underlaying cellular system in a multiple cellular networks, which takes advantages of NOMA and D2D systems to increase the available throughput of the wireless networks
Summary
Non-orthogonal multiple access (NOMA) is one of the promising multiple access to realize the challenging requirements of 5G [1, 2], such as massive connectivity, high data rate, and low latency. Unlike conventional orthogonal multiple access, NOMA uses the power domain to serve multiple users at different power levels at the same time, code, and frequency [3], in which superposition coding and successive interference cancellation (SIC) are employed [4]. In [12] and [14], mode selection in underlay D2D networks is studied, while [13] investigates an efficient way of reusing the downlink resources for cellular and D2D mode communication. A step further from D2D pairs, [15] studies D2D groups that use NOMA as their transmission technique to serve multiple D2D receivers. Zhao et al [16] consider the setting of an uplink single-cell cellular network communications. In order to further improve the outage performance of the NOMA-weak user in a user pair and reduce cooperative
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