Receiving apparatus for spectrum spread system
US5822364A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1997 |
| Grant date | Oct 13, 1998 |
| Priority date | — |
| Expiry date | Mar 26, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/7085
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A spectrum spread receiver is provided with a delayed waveform phase determination circuit which determines whether or not a detected delayed waveform is in the phase as the previously-detected delayed waveform, and outputs a delayed waveform switch signal if they are out of phase with each other. If the delayed waveform switch signal is in an ON state, on the basis of the signal despread by a second despreading circuit 7 and the delayed waveform switch signal, a demodulation circuit 9 demodulates the first half and second half of a received signal, as a boundary is a received signal at which a delayed waveform switch signal is turned on, by using the phase estimated from a first known signal and the phase estimated from a second known signal, thereby preventing the received signal from becoming degraded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.