Robust Transmission in Non-Orthogonal Multiple Access AF Relay Networks

SINR-Outage Minimization of Robust Beamforming for the Non-Orthogonal Wireless Downlink

“…In [31], two types of imperfect CSI were considered and MIMO-NOMA was designed for communicating with users in multiple clusters subject to certain outage constraints. Zhao et al [32] studied a robust sum rate optimization problem in a NOMA amplify-and-forward (AF) relay network. In [33], the authors conceived robust beamforming for the NOT-aided multipleinput single-output (MISO) downlink in the face of bounded channel uncertainties in a single-user cluster.…”

Robust Security Beamforming for SWIPT-Assisted Relay System with Channel Uncertainty

“…Assuming the CSI error between the base station and the user in a bounded ellipsoid region, a robust beamforming scheme based on S-procedure is proposed to achieve the minimum base station transmission power [ 14 ]. The robust sum rate optimization in non-orthogonal multiple access (NOMA) amplifying and forwarding (AF) relay networks is considered in [ 15 ], and the power allocation scheme and beamforming matrix are jointly optimized to achieve the maximum rate at the quality of service (QoS) constraints and relay transmission power constraints. In addition, a joint information beamforming and energy beamforming scheme based on semidefinite relaxation (SDR) and successive convex approximation (SCA) techniques is proposed to achieve the maximum secrecy rate of the multiple input single output (MISO) network [ 16 ], in which the CSI error is also restrained in a bounded elliptic region.…”

“…It is worth noting that the difference between our work and the above works are the following. Different from [ 13 ], we discussed the bounded ellipsoid model of the channel error instead of the Gaussian distribution model, which is widely used in the literature [ 14 , 15 , 16 , 17 , 18 ]. Although the bounded ellipsoid channel error model is discussed in [ 14 , 15 , 16 , 17 , 18 ], the point to point algorithm proposed in [ 14 , 16 , 17 ] can not be directly generalized to our SWIPT relay network.…”

“…Different from [ 13 ], we discussed the bounded ellipsoid model of the channel error instead of the Gaussian distribution model, which is widely used in the literature [ 14 , 15 , 16 , 17 , 18 ]. Although the bounded ellipsoid channel error model is discussed in [ 14 , 15 , 16 , 17 , 18 ], the point to point algorithm proposed in [ 14 , 16 , 17 ] can not be directly generalized to our SWIPT relay network. The security problem of two-tier downlink heterogeneous network is studied in [ 18 ], since channel error between the base station and the eavesdropper is not involved in [ 18 ], and their system models are too different from ours, and its conclusions could not be directly extended to SWIPT WSN.…”

“…The security problem of two-tier downlink heterogeneous network is studied in [ 18 ], since channel error between the base station and the eavesdropper is not involved in [ 18 ], and their system models are too different from ours, and its conclusions could not be directly extended to SWIPT WSN. The research in [ 15 ] only focuses on how to obtain the best quality of service for users, while ignoring the problem of user information leakage. Our research can effectively prevent information leakage while maximizing user transmission rate.…”