Device for detecting BPSK modulated singular words suitable for a TDMA analog modem and detection method used therein
US5548618A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1994 |
| Grant date | Aug 20, 1996 |
| Priority date | — |
| Expiry date | Jun 27, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/042
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A device for recovering the carrier of a TDMA signal supplies the complex envelope of this signal on a real channel and an imaginary channel. Circuitry for offsetting the constellation of the complex envelope by .pi./4 supply a complex signal on a main channel and on an auxiliary channel. An energy detector arrangement controls a multiplexer so that it supplies to a correlator whichever of the real or imaginary channels conveys the greater energy. The correlator calculates the correlation level between the multiplexer output signal and a reference singular word. An arrangement for comparing the correlation level with a threshold value indicates detection of the singular word in the signal on the channel applied to the correlator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.