Can I use my android as a wifi bridge via USB?
Setup the phone as a modem. Still most android phones can be setup as a WiFi hotspot. 

Following URLs may help you


http://benchmarkreviews.com/index.php?option=com_content&amp;task=view&amp;id=658&amp;Itemid=38
http://blogs.computerworld.com/smartphones/20726/android-wifi-hotspot