CDMA communication system using orthogonal code
US5983113A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 18, 1997 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Jun 18, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/7103
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
With a CDMA mobile communication system of the present invention, the phase difference sensing circuit of the base station senses the phase difference with respect to a reference phase from the cross-correlation value of the up-link channel signals coming from mobile stations and sends timing control information for compensating the phase difference closer to zero to the mobile stations. Then, in each of the mobile stations, the transmission timing control circuit variably sets the amount of delay in the delay circuit of the modulation circuit according to the timing control information sent from the base station. This enables the transmission timing of the transmission signal of each of the mobile stations to undergo delay control, maintaining the orthogonality between the individual up-link channel signals at the base station.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.