Wireless data communication system
US5583852A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1994 |
| Grant date | Dec 10, 1996 |
| Priority date | — |
| Expiry date | Dec 21, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W72/00
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A wireless data communication system comprises: base stations located to have cells arranged equidistantly therebetween; mobile units, each being located within either of the cells, each of the base stations communicating with mobile units within its cell through plural channels provided by FDM. In the system, each of the base station may comprise a detector for monitoring the channels and detecting a free channel, and a transmission portion for continuously transmitting a signal including data indicative of the detected free channel. In the system, the plurality of channels used in one of cells have given frequency bands respectively which are the same as given frequency bands in other cells. In the system, each of the mobile stations may comprise a chip synchronizing circuit for effecting chip synchronizing between the each of the mobile stations and its base station. In that system, a mobile unit having an antenna whose directivity is controllable, measures distances to determine a direction to its base station with measured distances and received distance from other mobile unit. In that system, a channel with an interference is detected and inhibited to be used and data indicat…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.