You talking about an 1803 router with wireless? Well just to let you know, you can have APs with a single or multiple SSIDs provide roaming as long as you have coverage and the traffic stays on the same subnet. I don't know about using an 1803 as an access point, your better off picking up a few 1131's of eBay which you can find pretty cheap.
Ronny: as long as the SSIDs with exact same config (name, auth, encryption...etc.). And it is highly recommended and best practice to have non-overlapping channels for your 3 SSID's. You need also to keep 15-20 % cell overlapping between your APs for roamong to work properly.
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