Timing control for Modem receivers
US4969163A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 1, 1989 |
| Grant date | Nov 6, 1990 |
| Priority date | — |
| Expiry date | Sep 1, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/10
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
For a modem receiver using an adaptive equalizer with fractional tap spacing, method and apparatus are disclosed for controlling the sample-timing phase. By evaluating bandedge components of the received signal in a particular way, a timing-phase vector signal is derived which is independent of the signal energy at the bandedges and of the quality of frequency separation of the filters for the bandedge signals. After an initial period, the current timing-phase vector signal is captured and stored as a reference. Thereafter, the sampling phase of the receiver is kept at its initial random value, represented by the stored reference timing-phase vector. The necessity to initially change the sampling phase in the receiver to a value which is forced by the received signal is avoided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.