Direct-sequence spread-spectrum communication system
US5689525A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 4, 1995 |
| Grant date | Nov 18, 1997 |
| Priority date | — |
| Expiry date | Aug 4, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/709
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A clock signal generator produces a basic clock signal. A variable delay device is operative for delaying the basic clock signal by an adjustable interval and thereby converting the basic clock signal into a delay-resultant clock signal. A pseudo-noise code is generated at a timing depending on the delay-resultant clock signal. A spread-spectrum information signal is despread into a non-spread information signal in response to the pseudo-noise code. A correlator detects a correlation between the spread-spectrum information signal and the pseudo-noise code. The adjustable interval provided by the variable delay device is controlled in response to the detected correlation to provide synchronization between the spread-spectrum information signal and the pseudo-noise code.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.