Method for the transferring a digital data signal using spread spectrum
US6393048B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 8, 1998 |
| Grant date | May 21, 2002 |
| Priority date | — |
| Expiry date | Oct 8, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/707
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In the method for the transfer of a digital data signal with predetermined band width from a transmitter to a receiver, the spread spectrum technique is used. In the method, the data signal is modulo-2 added with a PN code sequence, the bit rate of which is very much higher than the bit rate of the data signal. A carrier is then modulated with the resulting spread signal, after which the carrier is transmitted. The modulated carrier is demodulated in a receiver and the demodulated signal, to obtain the data signal, is multiplied with the PN code sequence produced in the receiver, synchronized with the PN code sequence of the transmitter by autocorrelation. A periodic rectangular signal with a constant duty cycle is used as code sequence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.