Patent ID: 8670555
Filing Date: 2014-03-11
Classification: H04B

Abstract:
1. A communication apparatus comprising: a transmitter, for transmitting a first training sequence to a second communication apparatus after a calibration order is decided by the communication apparatus and the second communication apparatus according to a master-slave relationship between the communication apparatus and the second communication apparatus; an analog-front-end circuit, coupled with the transmitter, for receiving and processing an analog input signal during a period, wherein the period starts while the transmitter transmits the first training sequence to the second communication apparatus and the period ends before the analog-front-end circuit receives a second training sequence; an analog-to-digital converter (ADC), coupled with the analog-front-end circuit, for converting processed signal from the analog-front-end circuit into a digital input signal; and a control unit, coupled with the ADC and the transmitter, for adjusting at least one resistance, at least one capacitance, or at least one resistance and at least one capacitance in an analog echo cancellation circuit according to the digital input signal before the analog-front-end circuit receives the second training sequence; wherein the second training sequence is a very first training sequence transmitted from the second communication apparatus after the calibration order is decided.