Channel calibration for a time division duplexed communication system
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United States of America Patent
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Oct 29, 2013
Grant Date -
Jun 16, 2005
app pub date -
Jan 27, 2005
filing date -
Oct 25, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Techniques are described 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 method, pilots are transmitted on the downlink and uplink channels and used to derive estimates of the downlink and uplink channel responses, respectively. Correction factors for the access point and correction factors for the user terminal are determined based on (e.g., by performing matrix-ratio computation or minimum mean square error (MMSE) computation on) the downlink and uplink channel response estimates. The correction factors for the access point and the correction factors for the user terminal are used to obtain a calibrated downlink channel and a calibrated uplink channel, which are transpose of one another. The calibration may be performed in real time based on over-the-air transmission.
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