CHANNEL CALIBRATION FOR DUPLEX COMMUNICATION SYSTEM WITH TIME DIVISION MULTIPLEX Russian patent published in 2010 - IPC H04B7/05 

FIELD: information technology.

SUBSTANCE: in the calibration method, pilot signals are transmitted over downlinks and uplinks and are used to derive estimates downlink and uplink characteristics, respectively. Correction coefficients for an access point and correction coefficients for a user terminal are determined based on (for example by calculating the ratio of matrices or calculating minimum mean-square error (MMSE)) estimates of downlink and uplink characteristics. Correction coefficients for the access point and correction coefficients for the user terminal are used to obtain a calibrated downlink and a calibrated uplink, which are transposed relative each other. Calibration can be carried out in real time based on radio transmission.

EFFECT: high efficiency owing to taking account of differences in frequency characteristics of downlinks and uplinks.

32 cl, 8 dwg, 3 tbl