Performance Analysis Of Non-orthogonal Multiple Access Cellular Networks

In the context of the era of big data,the demand of communication data has grown exponentially,ultra-dense cellular mobile networks,NOMA(Non-orthogonal multiple access,NOMA)and full duplex have become a member of the 5G mobile communication,correspondingly.Owing to the distribution characteristics of base stations and users in the dense NOMA-based cellular network,the stochastic geometry,a mathematical theory,is used as mathematical analysis tool to study the performance of multi-cell NOMA-based cellular networks.The main contributions of this thesis are listed as follows:(1)Aiming at the imperfect interference cancellation in NOMA-based cellular network and introducing the channel gain distribution,the performance of the network is studied in transmission environment with Nakagami fading under random user selection and fixed power allocation.Firstly,according to the channel gain distribution user's coverage probability and average achievable rate are derived under the condition of imperfect SIC(Successive Interference Cancellation).Then,based on the expression of coverage probability,the network performance metrics,such as area spectral efficiency and area energy efficiency are derived.Finally,the effects of fixed power allocation,imperfect SIC and path loss exponent on NOMA cellular network are analyzed.Theoretical numerical results show that the NOMA with imperfect SIC can achieve better user fairness and higher energy efficiency through power allocation compared with the OMA.(2)Considering the base station's self-interference and the mix interference of OMA uplink and NOMA downlink,the performance of NOMA cell networks with full-duplex base station is investigated in transmission environment with Rayleigh fading.Furthermore,the coverage probabilities and average achievable rate of the target cells in the OMA uplink and NOMA downlink scenarios are respectively deduced.Finally,the performance of full duplex NOMA network under residual self-interference and imperfect SIC is discussed.Through the simulation,with ideal self-interference cancellation,the full duplex hybrid access NOMA cellular network can improve the performance of remote user and increase the amount of equipment access in network.