Non-coherent synchronization signal detector
US5539783A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 18, 1995 |
| Grant date | Jul 23, 1996 |
| Priority date | — |
| Expiry date | May 18, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/08
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A system and technique for detecting a recurring signal, for example, a synchronization pulse contained in an information signal stream modulated on a carrier signal, wherein the recurring signal has a known duration (.tau.) and a known period (T). The signal carrier is demodulated such that the recurring signal exhibits a certain characteristic amplitude variation over its duration .tau., and the demodulated signal carrier is sampled at intervals less than .tau. thereby obtaining signal samples exhibiting the amplitude variation of the recurring signal. The signal samples are applied to an input of a coincidence network including at least one delay circuit which provides a delay corresponding to the period T of the recurring signal to a passing signal sample, and input and output terminals of each delay circuit are coupled to different inputs of an associated coincidence gate circuit. Each coincidence gate circuit produces an output whenever its input signal samples coincide with one another. The number of outputs of all gate circuits are added at each sample interval, and the total numbers obtained are summed over a time window corresponding to the duration .tau. of the recurring…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.