Non-Orthogonal Multiple Access (NOMA) Based Resource Management In Wireless Networks

The rapid growth of mobile terminals makes explosive growth of data traffic.How to effectively cope with such a huge data traffic is eager issue for network operators.The Non-Orthogonal Multiple Access(NOMA)has been considered as a promising scheme to slove this issue.By enabling a group of wireless terminal users to share a same frequency channel,which improves the spectrum efficiency and energy efficiency.The main contributions of this thesis are as follows:1.In relay-transmission networks,this thesis proposes an optimal power allocation and scheduling problem.With the help of convexity and monotonicity,this thesis proposes a layered-algorithm to compute the optimal power allocation solution.Numerical results show that the proposed NOMA relay-transmission can increase the throughput up to 30 percent compared with the conventional Time Division Multiple Access(TDMA)scheme.Furthermore,this thesis proposes a hybrid NOMA(HB-NOMA)relay that adaptively exploits the NOMA relay and the TDMA relay.2.In downlink single-cell networks,this thesis proposes a joint optimisation scheme of the bandwidth and the transmit-power allocations.By characterising the connection between the bandwidth and the transmit powers,the joint optimisation problem can be transformed into a bandwidth optimisation problem,and proposes an algorithm to compute the optimal bandwidth allocation and the corresponding transmit powers.Numerical results validate the proposed algorithm and the advantage of the proposed joint bandwidth and power allocations for the NOMA transmission.