If you are expelled from your country and you are therefore an stateless you must compete under this flag and your tracksuit must be white, this is called Independent Olympic Participants (IOP) like in barcelona 92 Macedonia and the Federal Republic of Yugoslavia and sydney 2000 the east timor athletes
http://www.britannica.com/blogs/wp-content/uploads/2008/04/olympics.gif
if you win a medal they will run it up and the olympic anthem will be listened.