US 11,990,937 B2
Echo cancellation system and method
Mu Xu, Broomfield, CO (US); Zhensheng Jia, Superior, CO (US); Junwen Zhang, Broomfield, CO (US); Haipeng Zhang, Broomfield, CO (US); and Luis Alberto Campos, Superior, CO (US)
Assigned to Cable Television Laboratories, Inc., Louisville, CO (US)
Filed by Cable Television Laboratories, Inc., Louisville, CO (US)
Filed on Aug. 22, 2022, as Appl. No. 17/821,316.
Application 17/821,316 is a continuation of application No. 17/207,982, filed on Mar. 22, 2021, granted, now 11,424,828.
Application 17/207,982 is a continuation of application No. 16/869,265, filed on May 7, 2020, granted, now 10,958,345, issued on Mar. 23, 2021.
Claims priority of provisional application 62/957,615, filed on Jan. 6, 2020.
Claims priority of provisional application 62/844,379, filed on May 7, 2019.
Prior Publication US 2022/0407602 A1, Dec. 22, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04B 10/2507 (2013.01); H04B 10/40 (2013.01); H04B 10/69 (2013.01); H04Q 11/00 (2006.01)
CPC H04B 10/2572 (2013.01) [H04B 10/40 (2013.01); H04B 10/6971 (2013.01); H04Q 11/0067 (2013.01); H04Q 2213/1319 (2013.01)] 24 Claims
OG exemplary drawing
 
1. An echo cancellation system comprising:
a phase-distortion estimator configured to estimate, from an equalized signal derived from an unequalized echo-interference-signal, a plurality of phase-distortion estimates;
a phase retriever configured to retrieve a phase of a transmitted signal, to yield a phase-retrieved signal;
a subtractor circuit configured to generate a clean signal as a difference between a reconstructed echo signal and a first phase signal from which the unequalized echo-interference-signal is generated; and
a decision decoder configured to output a primary signal by mapping each of a plurality of clean-phase estimates of the clean signal to one of a plurality of constellation symbols associated with a modulation scheme of the primary signal.