Power distribution method for maximizing safety energy efficiency in non-orthogonal multiple access system

Abstract

The invention provides a power distribution method for maximizing safety energy efficiency in a non-orthogonal multiple access system.A NOMA system with a function of eavesdropper wiretapping useful information is provided, meanwhile, physical layer safety and 5G green communication requirements are considered; safety energy efficiency SEE is defined as the ratio of the safety and the rate of theNOMA system to the total consumed power, then the power distribution factor of each legal user and the total power distribution factor of the system are designed in an optimized mode, an optimal powerdistribution scheme is sought, and SEE maximization of the system is achieved.

Description

technical field [0001] The invention relates to a power allocation scheme in a non-orthogonal multiple access (NOMA) system. Background technique [0002] With the rapid development of mobile communication technology, the demand for mobile services is also increasing rapidly, resulting in increasingly tight spectrum resources. Therefore, it is necessary to study new multiple access technologies that can support more user connections, higher security, higher spectral efficiency and energy efficiency. [0003] NOMA technology is a promising multiple access technology for 5G wireless communication systems. In the traditional Orthogonal Multiple Access (OMA) technology, a single resource block in a given domain is allocated to only one user, while the NOMA technology allows multiple users to share the entire time-frequency resource block and achieve multiplexing in the power domain , and use the successive interference cancellation (Successive Interference Cancellation, SIC) m...

AI Technical Summary

Problems solved by technology

[0010] Most of the existing studies on power allocation in NOMA systems are based on maximizing the total capacity or sum rate of system users without considering eavesdroppers (such as literature 1, 2), and there are relatively few scenarios where eavesdroppers are considered , and there are eavesdroppers in the system involved in the present invention to eavesdrop on useful information

In addition, the existing research basically only considers the security of the physical layer or only considers the requirements of 5G green communication, and then seeks the optimal power allocation in the NOMA system based on security and speed or energy efficiency (such as literature 3, 4, 5), and fails to consider at the same time Physical layer security and green communication require these two key indicators to carry out optimal design of power allocation

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