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Online calibration is essential for the proper operation of six-port digital receivers in communication systems, as such calibration cancels out receiver ageing and manufacturing defects. Simple calibration methods, using only three or four signal standards (SS), were reported in a previous paper, where these methods were assessed using an ADS software simulation for an ideal six-port circuit. A unified and general theory is presented for examining the effects of hardware imperfection on the performance of a six-port receiver (SPR) calibrated using these simplified techniques. This can be used to establish permissible hardware tolerances for proper operation of SPRs in different digital modulations.
Microwaves, Antennas and Propagation, IEE Proceedings (Volume:153 , Issue: 2 )
Date of Publication: 3 April 2006