Apparatus and method for narrowband data transmission by means of a DSSS transmission system
US9742461B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 3, 2014 |
| Grant date | Aug 22, 2017 |
| Priority date | — |
| Expiry date | Jul 3, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/18
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A system providing a spread spectrum and a narrowband data transmission may comprise a DSSS transmitter and a DSSS receiver. The DSSS transmitter may convert a bit succession (di) into a chip succession (sk) using a chip sequence (cj, cj′) and send a succession of impulses (s(t)) corresponding to the chip succession (sk). The DSSS receiver may receive impulses (s(t)) sent by the transmitter and filter the received impulses (r(t)) using a filter having an impulse response (x(t)) dependent on the chip sequence (cj, cj′). The chip sequence (cj) may be a spread sequence. The narrowband data transmission may use chip sequence (cj′) and a corresponding impulse response (x(t)) of the filter. The chip sequence (cj′) does not comprise a succession having two directly successive arithmetic sign changes and an arithmetic sign change does not occur after the first and before the last chip in the chip sequence (cj′).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.