Weighted Sum Secrecy Rate Optimization for Cooperative Double-IRS-Assisted Multiuser Network

Algorithm 1

Lagrange dual algorithm for problem (12).

1: Initialization: set the accuracy , a feasible point and the searching bounds and ;

2: Calculate and . Ifthen and terminate; Otherwise, move to step 3;

3: Repeat

4: Calculate;

5: Update and according to Equations (17a) and (17b), respectively;

6: Ifset; Otherwise, setend if;

7: Until;

8: Output.