using pid controller to simulate adaptive transmit ower control as a mitigation technique

please i am carrying out a project on fade mitigation techniques using adaptive power control and i am interested on Zeigler Nichol Technique tunning using PID controller. I need a code for it. please can some one help me

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer