6G Green IoT Network: Joint Design of Intelligent Reflective Surface and Ambient Backscatter Communication

Algorithm 2

IRS phase shift optimization.

1:Initialize: backscatter coefficients generated in Algorithm 1, transmit beamforming vector generated in Algorithm 1; number of Gaussian randomization

2:Relax the constraint (23d), then optimize problem (P7) by CVX and get .

3:Perform eigenvalue decomposition

4:for to do

5:Get a rank-one solution of (P7): end for

6:Obtain the target value of problem (P7), where

7:Obtain the target value of problem (P5), where