pso optimazation for side lobe level

Hi to all, Could you help me please.I had a linear Array Factor with 7 elements, but the side lobe level still very high ( more than -20 dB).How can i optimize this values using PSO algorithm ?thank you in advance for your help. Find attached the description of steps of algorithm in section4 and my code .thank you in advance for your help

Answer 1

[Walter Roberson]

http://www.scielo.br/pdf/jmoea/v16n2/2179-1074-jmoea-16-02-0577.pdf

Answer 2

[YOSRA BOUCHOUCHA]

Thank you for your reply,i had this paper,just i need a help for the matlab code.