Radio remote interface for modulating/demodulating data in a digital communication system
US5970086A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 1997 |
| Grant date | Oct 19, 1999 |
| Priority date | — |
| Expiry date | May 22, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2007/047
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a digital communications system for communicating between two radios by transceiving a signal comprising a first type control signal, a second type data traffic signal, and a third type voice signal, a remote communication interface for providing transmission therebetweeen comprising a duplexer bridge network for transceiving the signal, low pass filters, and analog to digital and digital to analog converters for processing received and transmitted signals respectively, and a digital signal processor for modulating and demodulating the signal for transmission or reception according to the signal type. A control signal output from the digital signal processor enables adjustment of the clock sampling frequency during the reception and demodulation process to obtain bit sync, bit tracking and frequency tracking. The communication interface is operable to transceive either the modulated traffic, control, or voice signal, or combined modulated traffic and control signal, or combined modulated voice and control signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.