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Energy-Efficient Power Allocation for NOMA With Imperfect CSI
- Source :
- IEEE Transactions on Vehicular Technology. 68:1009-1013
- Publication Year :
- 2019
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2019.
-
Abstract
- An optimum user power allocation solution to maximize the energy efficiency (EE) in a non-orthogonal multiple access (NOMA) system with imperfect channel state information at transmitter (CSIT) and user quality of service constraint is proposed. The EE objective function is a non-convex nonlinear function that leads to a fractional programming problem. To deal with this problem, an auxiliary variable is defined, which converts the problem into a convex one. A closed form optimal solution for the power allocated to each user is found using the Karush–Kuhn–Tucker conditions. Furthermore, difference of two concave functions—DC—programming and Dinkelbach structure are used to find close-to-optimal total power value (sum of powers being allocated to all users) for the multiuser NOMA system. Simulation results show that in terms of EE, for users with low rate requirement and with CSIT error, NOMA has a better performance compared with conventional orthogonal multiple access (OMA).
- Subjects :
- Mathematical optimization
Linear programming
Computer Networks and Communications
Computer science
Quality of service
Transmitter
Aerospace Engineering
020302 automobile design & engineering
02 engineering and technology
medicine.disease
Power (physics)
Noma
0203 mechanical engineering
Automotive Engineering
medicine
Electrical and Electronic Engineering
Efficient energy use
Subjects
Details
- ISSN :
- 19399359 and 00189545
- Volume :
- 68
- Database :
- OpenAIRE
- Journal :
- IEEE Transactions on Vehicular Technology
- Accession number :
- edsair.doi...........581f428f44e2b476d07b25507654b792