System and method for transmitting information signals
US5960047A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 1997 |
| Grant date | Sep 28, 1999 |
| Priority date | — |
| Expiry date | Nov 12, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B17/27
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system and method for transmitting information in which a relatively narrowband signal is transmitted followed by the transmission of a relatively wideband signal. The narrowband signal may be used by the receiver to alert the receiver to the upcoming wideband signal. In a system in which the transmissions occur asynchronously to the receiver, the receiver may be less complicated because the receiver is provided with an indication of the time and/or the center frequency of the wideband signal. Either the narrowband signal or the wideband signal may be used to transmit information from the transmitting device to the receiver. The system and method find particular advantage in tracking and locating systems in which a plurality of tags asynchronously transmit information and/or location information to a receiver or a set of receivers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.