Spread spectrum coding method and apparatus
US4606039A · kind A · utility
100Cited by
4References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1984 |
| Grant date | Aug 12, 1986 |
| Priority date | — |
| Expiry date | Jul 10, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/7073
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In a process for coding of radio transmissions by spectrum spreading, a signal is phase modulated by means of a 0-pi modulator controlled by a psuedo random sequence formed by combining in accordance with a logical majority function an odd number of elementary codes constituted by pseudo random binary sequences of different lengths. On reception, the synchronization of the code which controls the demodulator is realized by correlating each of the elementary codes with the received signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.