Patent ID: 8134976
Filing Date: 2012-03-13
Classification: H04B,H04L,H04W

Abstract:
1. A method for establishing peer-to-peer communications by a first user terminal (UT) in a wireless communication system, comprising: calibrating with an access point, by: obtaining an estimate of a downlink channel response; obtaining an estimate of an uplink channel response; determining first and second sets of correction factors based on the estimates of the downlink and uplink channel responses; and calibrating a downlink channel and uplink channel based on each of the first and second sets of correction factors, respectively, to form a calibrated downlink channel and a calibrated uplink channel; and determining a scaling value indicative of an average difference between the estimate of the downlink channel response and the estimate of the uplink channel response, wherein the estimates for the downlink and uplink channel responses are normalized to account for receiver noise floor; and establishing direct peer-to-peer communication with a second UT that has also calibrated with the same or a different access point, wherein the establishing is performed without further calibration between the first and second UTs.