Hardware efficient implementation of decision feedback phase estimation for an ultra high speed coherent receiver
US9628193B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 2013 |
| Grant date | Apr 18, 2017 |
| Priority date | — |
| Expiry date | Aug 5, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/6165
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method for estimating the phase of a modulated complex optical signal, according to which, the phase of the signal is isolated and the complex amplitude of the signal is digitized by a block of P samples. An adaptive filter minimizes phase-error between the phase of the received symbol and the phase of a sample, rotated by a phase correction factor, by iteratively performing a Block-Wise Phase LMS estimation on the samples using a step size parameter. During each iteration, the resulting correction factor consists of the sum of the estimated errors multiplied by this parameter, and the correction factor of previous iteration, which is updated, until obtaining the final correction factor from the last iteration. The samples constituting the received signal are recovered by adding the most updated correction factor to the phase of each sample and performing a decision regarding the phase of each sample.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.