Automatic adaptive equalizer
US5168507A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1989 |
| Grant date | Dec 1, 1992 |
| Priority date | — |
| Expiry date | Nov 9, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D2200/0082
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A digital wireless subscriber telephone unit for wireless communication with a base station. An IF is used within the subscriber unit and base station which is combined with a carrier signal generated by a synthesizer for RF transmission between stations. In intervals between actuation of the system, a training mode is used wherein a known training signal is compared with a known values to produce correction coefficients to compensate for undesirable variations in timing and/or frequency, these constants being stored for use in correcting actual received signals. During demodulation, the modulated digital signals are fed to the modem processor in the form of time multiplexed I and Q samples and are demultiplexed. The demultiplexed I and Q samples are fed to an equalizer and frequency correction circuit for minimization of errors for production of a frequency correction signal based upon the correction coefficients which is used to correct any errors in the timing and frequency of the system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.