Method and apparatus for adaptively classifying a multi-level signal
US6198779A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 1999 |
| Grant date | Mar 6, 2001 |
| Priority date | — |
| Expiry date | May 5, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/10
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A radio receiver circuit (200) is used for receiving a multi-level signal (201) that includes a plurality of symbols, wherein each level is representative of a symbol of data. Baseband samples are generated for each symbol, whereby each baseband sample has a phase and a signal level. The radio receiver circuit (200) measures the received signal environment. A digital circuit (212) selects a scan duration from a scan duration table (251) based on the measured signal environment and a combination of signal types used for classification of the received signal. The digital circuit tallies, by category, occurrences of the baseband samples, whereby each category is representative of one of a plurality of phases, and one of a plurality of signal level ranges. The digital circuit (212) selects a set of optimized thresholds from a table of predetermined, optimized thresholds (252), based on the measured signal environment and a combination of signal types, and correlates the tallies to at least one template, and classifies the multi-level signal according to the correlation results and the selected optimized thresholds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.