Spread spectrum communication device
US5323419A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 17, 1993 |
| Grant date | Jun 21, 1994 |
| Priority date | — |
| Expiry date | Feb 17, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J13/0077
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In a spread spectrum communication system for communicating data by spreading spectrum thereof, using PN codes, on the transmitter side, a first modulated output portion, which is spread-spectrum-modulated, containing no data to be transmitted and a second modulated output portion, which is spread-spectrum-modulated, following the first modulated output portion and containing data to be transmitted are generated; and the second modulated output portion is transmitted with a low electric power and the first modulated output portion with a high electric power. On the receiver side, a correlation-demodulated output is generated by correlation-demodulating a received input; and from the correlation-demodulated output consisting of a first correlation-demodulated output portion corresponding to the first modulated output portion and a second correlation-demodulated output portion corresponding to the second modulated output portion the first correlation-demodulated output portion is detected. Further timing signal serving as a reference for an operation on the receiver side is generated, starting from the first correlation-demodulated output portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.