室内VLC-NOMA网络的协作多点用户接入和功率分配OA北大核心CSTPCD

The combination of visible light communication(VLC)and non-orthogonal multiple access(NOMA)tech-nology is an important method to meet the needs of indoor high speed communication and broadband data access.Due to the increasing demand for indoor dense communication,inter cell interference(ICI)and resource scarcity are becoming in-creasingly severe.In order to reduce the ICI,further enhance the quality of experience(QoE)of indoor user's high-speed communication,and improve the spectrum resource utilization for VLC,a collaborative multi-point user access and power allocation algorithm is proposed for indoor VLC-NOMA.In the user access stage,a user access algorithm based on user needs of QoE and coordinated multi-point(UA-UEQCM)accessing VLC is designed.We can evaluate the QoE and equiva-lent mean opinion score(MOS)in terms of user's satisfaction value,according to the minimum rate required by user,the recommended rate value required by user,and the achievable rate provided by VLC-NOMA.Then,based on the MOS user required and the available resource of coordinated access point in VLC-NOMA,a utility function of NOMA group is put forward to optimize the bidirectional selection between user equipment and coordinated multiple access points of VLC for improving MOS in VLC-NOMA network.In the power allocation stage,a power allocation algorithm by using improved teaching and learning(PA-ITL)is adopted to optimize the power allocation of the NOMA group.We design the total MOS value of VLC-NOMA as the fitness function value,and use adaptive updating and learning modes to optimize the NOMA group's power allocation factor.The simulation results show that,compared with the comparison user access algorithm and power allocation,when the number of users is 26,the proposed user access algorithm and power allocation can improve the total MOS value by up to 18.06%and 8.60%for indoor VLC-NOMA networks,respectively.