Modem for use in multipath communication systems
US4694467A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 3, 1986 |
| Grant date | Sep 15, 1987 |
| Priority date | — |
| Expiry date | Jul 3, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0071
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A modem in which the transmitter uses spectrum spreading techniques applied to sequentially supplied input bits, a first group thereof having one spread spectrum sequence characteristic and a second group thereof having a different spread spectrum sequence characteristic, the spread spectrum bits being modulated and transmitted. The receiver generates complex samples of the received modulated signal at a baseband frequency and uses a detector for providing signal samples of the complex samples which are time delayed relative to each other. A selected number of the time delayed samples are de-spread and demodulated and the de-spread and demodulated samples are then combined to form a demodulated receiver output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.