Exploiting Opportunistic Scheduling for Physical-Layer Security in Multitwo User NOMA Networks

Algorithm 1

The Descent-based Algorithm for Finding .

Input: system parameters such as , , , , , , , ; and the given optimization parameters

 such as step size, = , search length, =

Output:

(1) Assign iteration index to the initial:

(2) Choose a starting point of the searching optimal value:

(3) while do

(4) Update the searching optimal value: ,

(5) end while

(6) return