I had to bind the values from another list  to all the controls of the form depending upon the title field but people picker control's value didn't appear.I did the following work around

1)Created a new single line of text column

2)Split the username variable to remove the token part(i0#) and to fetch name

3)Bind that username variable to single line of text column

4)After submit trigger a workflow to update peoplepicker value with single line of text

5)Trigger a mail to "Peoplepicker" control value