A repeater for re-transmitting uplink and downlink signals in a wireless network. The repeater uses antenna cross-polarization, signal cancellation and digital processing techniques to reduce or eliminate coupling of echo signals between the receive and transmit antennas of the downlink and uplink signal...http://www.google.com/patents/US20060014491?utm_source=gb-gplus-sharePatent US20060014491 - Apparatus and method for echo cancellation in a wireless repeater using cross-polarized antenna elements
