US 12,015,451 B1
Joint transmit/receive image compensation with blind adaptive calibration in a transceiver system
Kartik Sridharan, San Diego, CA (US); and Eric Ng, Belmont, MA (US)
Assigned to Anokiwave, Inc., San Diego, CA (US)
Filed by Anokiwave, Inc., San Diego, CA (US)
Filed on May 11, 2022, as Appl. No. 17/741,907.
Claims priority of provisional application 63/187,645, filed on May 12, 2021.
Int. Cl. H04B 17/14 (2015.01); H04B 17/24 (2015.01)
CPC H04B 17/14 (2015.01) [H04B 17/24 (2015.01)] 22 Claims
OG exemplary drawing
 
1. 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.