Spread spectrum modulation
US6023488A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 12, 1997 |
| Grant date | Feb 8, 2000 |
| Priority date | — |
| Expiry date | May 12, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L5/026
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A spread spectrum modulation system uses an input signal and a spreading signal for modulating the input signal. The spreading signal includes a plurality of component signals spaced apart substantially equally in frequency and with substantially equal amplitudes. Each component signal is phase encoded by either having a phase assigned by a random or pseudo-random number generator or by reference to a look-up table. Interference in the spread spectrum system is reduced by detecting, in the received signal, a channel or channels in which interference is present. The parts of the de-spreading signal corresponding to the channel or channels having interference are discarded, so as to form a modified de-spreading signal. The received spread spectrum signal is then de-spread using the modified de-spreading signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.