Multilevel QAM symbol timing detector and multilevel QAM communication signal receiver
US7933362B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 5, 2005 |
| Grant date | Apr 26, 2011 |
| Priority date | — |
| Expiry date | Aug 10, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/389
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A multilevel symbol timing signal detector is provided, which is used for reliably detecting the symbol timing of a multilevel QAM signal. When an oversampling I signal is inputted to I-Signal Histogram Generator 610, the signal is subjected to 1-symbol length buffering by computing absolute values. Sampling times corresponding to an oversampling frequency and amplitude data for these times are extracted from the buffered data and the amplitude data is buffered for each sampling time over predetermined intervals. Histograms of the amplitude data for each sampling time are generated based on these buffered amplitude data. Symbol timing is acquired by detecting a sampling time corresponding to the amplitude data with the highest frequency of detection based on the histograms of amplitude data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.