Joint transmit/receive image compensation with blind adaptive calibration in a transceiver system
AssigneeAnokiwave, Inc.
InventorsKartik Sridharan, Eric Ng
Life of this patent
Estimating the term…
Abstract
Joint transmit/receive image compensation is performed with the transceiver online and on an ongoing basis by using blind image compensation techniques when in a receive mode in order to converge receive image compensation coefficients based on “live” receive data and then in a transmit mode, after convergence of the receive image compensation coefficients, coupling the “live” transmit signal to the receive signal path to adapt the transmit image compensation coefficients.
Claims22
A joint transmit/receive image compensation system comprising:
- a transmit signal path comprising a transmitter for generating transmit signals to a transmit interface and a transmit image compensation filter for filtering images from the transmit signals;
- a receive signal path comprising a blind adaptive calibration circuit for joint transmit/receive image compensation and a receive image compensation filter for filtering images from receive signals;
- a switching circuit for selectively switching the receive signal path between a receive interface and the transmit signal path;
- and
- a calibration controller in communication with the switching circuit and configured to run:
- (a) an online receive calibration mode in which the switching circuit couples the receive signal path to the receive interface so that the blind adaptive calibration circuit receives signals from the receive interface and adapts receive image compensation coefficients for the receive image compensation filter based on the signals from the receive interface;
- and
- (b) an online transmit calibration mode in which, after convergence of the receive image compensation coefficients, the switching circuit couples the receive signal path to the transmit signal path so that the blind adaptive calibration circuit receives the transmit signals from the transmit signal path and adapts transmit image compensation coefficients for the transmit image compensation filter based on the transmit signals from the transmit signal path.
A joint transmit/receive image compensation method in a transceiver having a transmit signal path comprising a transmitter for generating transmit signals to a transmit interface and a transmit image compensation filter for filtering images from the transmit signals, a receive signal path comprising a blind adaptive calibration circuit for joint transmit/receive image compensation and a receive image compensation filter for filtering images from receive signals, and a switching circuit for selectively switching the receive signal path between a receive interface and the transmit signal path, the method comprising:
- in an online receive calibration mode, coupling, via the switching circuit, the receive signal path to the receive interface so that the blind adaptive calibration circuit receives signals from the receive interface and adapting, by the blind adaptive calibration circuit, receive image compensation coefficients for the receive image compensation filter based on the signals from the receive interface;
- and
- in an online transmit calibration mode, after convergence of the receive image compensation coefficients, coupling, via the switching circuit, the receive signal path to the transmit signal path so that the blind adaptive calibration circuit receives the transmit signals from the transmit signal path and adapting, by the blind adaptive calibration circuit, transmit image compensation coefficients for the transmit image compensation filter based on the transmit signals from the transmit signal path.
An RF integrated circuit (RFIC) including a joint transmit/receive image compensation system, the RFIC comprising:
- a transmit signal path comprising a transmitter for generating transmit signals to a transmit interface and a transmit image compensation filter for filtering images from the transmit signals;
- a receive signal path comprising a blind adaptive calibration circuit for joint transmit/receive image compensation and a receive image compensation filter for filtering images from receive signals;
- a switching circuit for selectively switching the receive signal path between a receive interface and the transmit signal path;
- and
- a calibration controller in communication with the switching circuit and configured to run:
- (a) an online receive calibration mode in which the switching circuit couples the receive signal path to the receive interface so that the blind adaptive calibration circuit receives signals from the receive interface and adapts receive image compensation coefficients for the receive image compensation filter based on the signals from the receive interface;
- and
- (b) an online transmit calibration mode in which, after convergence of the receive image compensation coefficients, the switching circuit couples the receive signal path to the transmit signal path so that the blind adaptive calibration circuit receives the transmit signals from the transmit signal path and adapts transmit image compensation coefficients for the transmit image compensation filter based on the transmit signals from the transmit signal path.
Dependencies are inferred from the claim text.