Patent ID: 8351492
Filing Date: 2013-01-08
Classification: H04B,H04L

Abstract:
1. An apparatus comprising: a transceiver having a receiver and a transmitter connected through a segment of a calibration loop back path; and a control system configured to communicate with said transceiver through an analog-to-digital converter connected to said receiver and a digital-to-analog converter connected to said transmitter; wherein said calibration loop back path has an intentional phase shift that can be toggled between an off state and an on state by said control system; and wherein said control system is configured to calculate said intentional phase shift by examining the difference of a first and a second phase angle, said first phase angle obtained from a first transmission of a first pair of signals with said intentional phase shift in said off state, and said second phase angle obtained from a second transmission of a second pair of signals with said intentional phase shift in said on state.