Hybrid Differential Evolution with Biogeography-Based Optimization for Design of a Reconfigurable Antenna Array with Discrete Phase Shifters

Algorithm 5

procedure Hybrid migration-operator of DE/BBO

Begin

   for  𝑖=1 to NP

       select randomly 𝑎≠𝑏≠𝑐≠𝑑≠𝑖

       𝑗_rand=⌊rand(0,1)^∗𝐷⌋

       for 𝑗=1 to D

       if rand(0,1)<𝜆_𝑖  then

       if rand(0,1)≤CR or j==𝑗_rand then

       𝑢_𝑖,𝑗=𝑥_𝑎,𝑗+𝐹×(𝑥_𝑏,𝑗−𝑥_𝑐,𝑗)

     else

     Select 𝑥_𝑘 with probability based on 𝜇_𝑘

       𝑢_𝑖,𝑗=𝑥_𝑘,𝑗

       end if

     else

        𝑢_𝑖,𝑗=𝑥_𝑖,𝑗

      end if

       end for

   end for

End