Channel calibration for a time division duplexed communication system
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United States of America Patent
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-
Mar 13, 2012
Grant Date -
May 6, 2004
app pub date -
Oct 23, 2003
filing date -
Oct 25, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Techniques to calibrate the downlink and uplink channels to account for differences in the frequency responses of the transmit and receive chains at an access point and a user terminal. In one embodiment, pilots are transmitted on the downlink and uplink channels and used to derive estimates of the downlink and uplink channel responses, respectively. Two sets of correction factors are then determined based on the estimates of the downlink and uplink channel responses. A calibrated downlink channel is formed by using a first set of correction factors for the downlink 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 performed in real-time based on over-the-air transmission.
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