Patent ID: 8885692
Filing Date: 2014-11-11
Classification: H04B,H04L

Abstract:
1. An apparatus comprising: a transceiver that includes a receiver, a transmitter and a calibration loop back path coupling the transmitter to the receiver, wherein the calibration loop back path has a first state and a second state, wherein no intentional phase shift is introduced to signals transmitted through the calibration loop back path in the first state, and wherein an intentional phase shift is introduced to signals transmitted through the calibration loop back path in the second state; and a control system coupled to the transceiver, wherein the control system is configured to identify the intentional phase shift by determining a difference between a first phase angle and a second phase angle, wherein the first phase angle is obtained in response to transmitting a first pair of signals from the transmitter to the receiver through the calibration loop back path while the calibration loop back path is configured in the first state, and the second phase angle is obtained in response to transmitting a second pair of signals from the transmitter to the receiver through the calibration loop back path while the calibration loop back path is configured in the second state.