Computer Science ›› 2021, Vol. 48 ›› Issue (3): 269-274.doi: 10.11896/jsjkx.191100213

• Computer Network • Previous Articles     Next Articles

Collaborative Optimization of Joint User Association and Power Control in NOMA Heterogeneous Network

CHENG Yun-fei, TIAN Hong-xin, LIU Zu-jun   

  1. State Key Laboratory of Integrated Service Network Theory and Key Technologies,Xidian University,Xi’an 710071,China
  • Received:2019-11-28 Revised:2020-04-19 Online:2021-03-15 Published:2021-03-05
  • About author:CHENG Yun-fei,born in 1993,postgraduate.His main research interests include non-orthogonal multiple access network and wireless communication.
    TIAN Hong-xin,born in 1968,master.His main research interests include communication signal processing,satellite communication and communication countermeasures.
  • Supported by:
    National Natural Science Foundation of China(61301170),Fundamental Research Funds for the Central Universities of Ministry of Education of China(JB150109) and Project 111(B08038).

Abstract: Aiming at the two-layer heterogeneous network of non-orthogonal multiple access(NOMA) system,a cooperative optimization problem of user association and power control based on utility function maximization model is proposed.In this problem,the total energy efficiency of the system is taken as a utility function,and a joint user correlation and power control algorithm is proposed under the constraint of certain QoS and maximum power limit.This algorithm first converts the original problem with parameter polynomial form of the problem.In the outer loop,it uses the dichotomy of optimal energy efficiency factor.Then in the inner loop,respectively,it uses distributed user correlation algorithm and power control algorithm to get the best user incidence matrix and optimal transmission power.Finally,it realizes the system energy efficiency maximization.Simulation results show that the proposed algorithm performs better in energy efficiency than the single fixed power allocation scheme and fixed user association scheme.

Key words: Energy efficiency, Heterogeneous network, NOMA, Power control, User association

CLC Number: 

  • TN915.6
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