The only way for you to get the best out of your connection currently is for you to put your ps3 into DMZ or port forward the game, if your internet is running through a router anyway. It may not improve it vastly seem it's mostly the matchmaking that seems to be the problem. But it may help you find some more games that will be closer to you.
for the fear of being a noob ... but what do you mean by putting your PS3 into DMZ?
You don't know the answer to something, google is your best friend. http://forums.afterdawn.com/thread_view.cfm/610541
Something with ports