CDMA communications and geolocation system and method
US5365544A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 23, 1994 |
| Grant date | Nov 15, 1994 |
| Priority date | — |
| Expiry date | Feb 23, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W88/08
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A spread-specttrm CDMA communications system for locating remote units, and for communicating message data between a plurality of remote units and a base station. The spread-spectrum CDMA communications system includes a plurality of base stations and a plurality of remote units. A base station has a spread-spectrummodulator for spread-spectrum processing the message data, and a transmitter for transmitting the spread-spectrum processed-message data, combined with a generic-chip-code signal, from the base station to a remote unit. The base station also has an antenna, and spread-spectrum detectors for recovering message-data communicated from the remote-units. A remote-unit has an antenna, and a detector coupled to the antenna for recovering data communicated from the base station. The detector includes a spread spectrum demodulator. Also, the remote unit has a device for converting the format of the data into a form suitable for communicating over radio waves, a spread spectrum modulator and a transmitter. The base station has a range circuit, which compares the generic-chip-code signal generated at the base station with the generic-chip-code signal received from the remote unit, …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.