CORRECTION FOR DIFFERENCES BETWEEN DOWNLINK AND UPLINK CHANNEL RESPONSES

摘要

In one embodiment, pilots are transmitted on the downlink and uplink channel s and used to derive estimates of the downlink and uplink channel responses, respectively. Two sets of correction factors are then determined based on th e estimates of the downlink and uplink channel responses. A calibrated downlin k channel is formed by using a first set of correction factors for the downlin k channel, and a calibrated uplink channel is formed by using a second set of correction factors for the uplink channel. The first and second sets of correction factors may be determined using a matrix-ratio computation or a minimum mean square error (MMSE) computation. The calibration may be perform ed in real-time based on over-the-air transmission.