… when the same imperfect CSI is assumed at both sides of the link. However, when the CSI …
, into the transmitter cost function, different levels of CSI. Alternatively, we divide the design in …

… Moreover, in this paper, we consider imperfect CSI for the energy efficient resource allocation
problem and formulate it as a probability mixed non-convex optimization problem. The …

… , which equals to the total power being allocated to all users. Our problem formulation in
this work is to maximize EE using optimum user power allocation with imperfect CSI. The …

… imperfect channel state information (CSI) in the presence of spatially randomly distributed
eavesdroppers. We derive the optimal solutions of the power allocation … power allocation …

… schemes, the perfect channel state information (CSI) is … a power allocation scheme to
maximize energy efficiency for downlink NOMA heterogeneous networks based on imperfect CSI. …

… It is difficult to obtain exact CSI … Imperfect CSI: Since it is difficult to obtain perfect CSI due
to quantization errors and parametric estimation errors, robust RA schemes with imperfect CSI …

… with imperfect CSI [20], [21] or lacked research on the EE of massive MIMO CRNs [3], [4], [22]–
[25], in this paper, we study an energy-efficient joint power allocation … under imperfect CSI. …

… adaptive modulation and imperfect channel state information (CSI) are investigated … power
allocation (PA) to maximize the SE is firstly formulated subject to the maximum transmit power …

… In this paper, we investigate power allocation using only the largescale CSI. Unlike in [8]–[10]
where … The power allocation problem is formulated as a nonconvex fractional programming …

… power allocation problem that maximizes energy efficiency for a Massive MIMO downlink
system with imperfect CSI… an energy-efficient power allocation iterative algorithm for the …