CDMA communications and geolocation system and method

Details CDMA communications and geolocation system and method CDMA communications and geolocation system and method

1994-02-23

1994-11-15

Cangialosi, Salvatore

Pulse or digital communications

Repeaters

Testing

H04L 2730, H04K 100

Patent

active

053655443

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, for determining a range between the remote unit and the base station.

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Pleading in suit between InterDigital Technology Corp. and Ohi America, Inc. et al., Defendant Qualcomm Incorporated's Supplemental Responses to Plaintiff's Interrogatories 3,5,12 and 13; U.S. Dist. Ct. for the Eastern Dist. of Pa.; Civil Case No. 93-CV-2004 (Baille An.) pp. 5-6, 12-13.

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