The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 27, 2016
Filed:
Jul. 27, 2015
Sanguoon Chung, San Diego, CA (US);
Sanguoon Chung, San Diego, CA (US);
Other;
Abstract
The present invention is a method and apparatus for mitigating phase noise in data communication systems. The present invention provides effective phase noise mitigation with very low latency by combining the decision feedback equalizer and carrier recovery loop effectively. The phase noise estimate is obtained by calculating the phase difference between the input and output of the decision device (DD) in the decision feedback equalizer (DFE) and then applying a digital phase locked loop (DPLL) on the phase difference. Deriving the phase noise estimate from the phase noise estimation process, phase noise mitigation is obtained by multiplying the phase noise estimate at the input signal of the feedforward filter (FFF) and at the input signal of the DD in DFE. An accurate signal-to-noise ratio (SNR) estimate is also obtained in the process of the filter coefficient update process in the DFE.