期刊
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
卷 17, 期 3, 页码 1502-1517出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TWC.2017.2779504
关键词
Millimeter wave (mm-wave); non-orthogonal multiple access (NOMA); power allocation; user scheduling
资金
- National Science Foundation of China [61731017]
- 111 Project [111-2-14]
- U.K. EPSRC [EP/L025272/1]
- H-MSCA-RISE [690750]
- Engineering and Physical Sciences Research Council [EP/L025272/1] Funding Source: researchfish
- EPSRC [EP/L025272/1, EP/N029720/2] Funding Source: UKRI
This paper investigates the application of non-orthogonal multiple access (NOMA) in millimeter wave (mm-Wave) communications by exploiting beamforming, user scheduling, and power allocation. Random beamforming is invoked for reducing the feedback overhead of the considered system. A non-convex optimization problem for maximizing the sum rate is formulated, which is proved to be NP-hard. The branch and bound approach is invoked to obtain the epsilon-optimal power allocation policy, which is proved to converge to a global optimal solution. To elaborate further, a low-complexity suboptimal approach is developed for striking a good computational complexity-optimality tradeoff, where the matching theory and successive convex approximation techniques are invoked for tackling the user scheduling and power allocation problems, respectively. Simulation results reveal that: 1) the proposed low complexity solution achieves a near-optimal performance and 2) the proposed mm-Wave NOMA system is capable of outperforming conventional mm-Wave orthogonal multiple access systems in terms of sum rate and the number of served users.
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