Spread spectrum digital transmission system using low-frequency pseudorandom encoding of the wanted information and spectrum spreading and compression method used in a system of this kind
US5546423A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 1994 |
| Grant date | Aug 13, 1996 |
| Priority date | — |
| Expiry date | Jun 8, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04K1/02
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A spread spectrum digital transmission system using low-frequency pseudorandom encoding of desired information, and a spectrum spreading and compression method used in such a system. In a transmitter in the system, each block of a digital signal to be transmitted is combined with a sample obtained from a low-frequency pseudorandom generator. The resulting various combinations are converted into orthogonal or quasi-orthogonal sequences which are modulated and transmitted to a receiver. The receiver demodulates the signal received and combines each sequence with a sample identical to that used for the low-frequency coding at the transmitter to recover the various blocks of the transmitted signal. Hence, low frequency spectrum spreading of a signal to be transmitted is achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.