MIMO equalization optimized for baud rate clock recovery in coherent DP-QPSK metro systems
US9608735B2 · kind B2 · utility
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Key dates
| Filing date | Mar 10, 2015 |
| Grant date | Mar 28, 2017 |
| Priority date | — |
| Expiry date | Apr 30, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2096
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present invention is directed to a MIMO equalization system and method, optimized for baud rate clock recovery in coherent symbol-spaced DP-QPSK Metro systems. According to this method, the Mueller & Muller timing function is extended to cope with controlled ISI induced signals, while decoupling between MIMO equalization and clock recovery loops, using a midpoint output of the equalizer for timing estimation, instead of its final output. At least a portion of controlled Inter-Symbol Interference (ISI) is kept intact and the controlled ISI is compensated by an MLSE, right after carrier timing synchronization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.