Spectrum spread communication system
US6195343A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 12, 1997 |
| Grant date | Feb 27, 2001 |
| Priority date | — |
| Expiry date | Mar 12, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/06
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In base station side equipment, a control channel for transmitting control information and a communication channel for transmitting information to each mobile station are spread with different synchronizing codes before being superposed by operating a switch to switch the output of an adder over to the output of a synchronizing code generator. Further, a synchronizing code is periodically inserted in a signal by one symbol length and the signal is transmitted over the superposed channel. In a plurality of base station side equipment, moreover, the synchronizing code and its transmission period are equal and the transmission timing is asynchronous and independent. A synchronizing correlator in mobile station side equipment obtains the correlation value of the whole chip phase in a synchronizing code transmission period using the synchronizing code and decides a base station which is transmitting the synchronizing code at the greatest correlating peak position to the closest one and further extracts symbol timing from the peak position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.