Importance

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Abstract

A spread spectrum CDMA communications system for communicating message data between a plurality of users to a plurality of PCN units. The spread spectrum communications system is located within a same geographical region as occupied by a pre-existing system such as a cellular telephone system or microwave system. The spread spectrum CDMA communications system can operate without causing undue interference to the cellular telephone system or microwave system and the cellular telephone system or microwave system can operate without causing significant interference, less than 1% total users affected, to the PCN system. The spread spectrum CDMA communications system includes a plurality of PCN-base stations and a plurality of PCN units. A PCN-base station has a device for converting the format of the message data into a form suitable for communicating over radio waves, a spread spectrum modulator for spread spectrum processing the message data, and a transmitter for transmitting the spread spectrum processed converted message data from the PCN-base station to a PCN unit. The PCN-base station also has an antenna, and spread spectrum detectors for recovering message data communicated from the PCN units. A PCN unit has an antenna, and a detector coupled to the antenna for recovering message data communicated from the PCN-base station. The detector includes a spread spectrum demodulator. Also, the PCN unit has a device for converting the format of the message message data into a form suitable for communicating over radio waves, a spread spectrum modulator, and a transmitter.

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First Claim