... opposite direction. The received signal isused as described in Section 2 in order to estimate the TDDcalibration coefficient that is (c tx2 c rx1)/ (c tx1 c rx2). The calibrationscheme is applied ... multiplication.diag(v)A diagonal matrix with the elements of v alongthe diagonal.diag (c 1, , c m)A diagonal matrix with scalars c 1, , c malongthe diagonal.2. Calibration ProcedureWe consider ... C MS,txHCBS,rxdiag1, c BS,tx2 c BS,rx1 c BS,tx1 c BS,rx2, , c BS,txm c BS,rx1 c BS,tx1 c BS,rxm=1 c BS,tx1 C MS,txHCBS,rx×diag c BS,tx1, c BS,tx2 c BS,rx1 c BS,rx2, , c BS,txm c BS,rx1 c BS,rxm= c BS,rx1 c BS,tx1 C MS,txH...