| 摘要 |
A spread spectrum CDMA communications system for communicating data and/or digitized voice between a plurality or users to a plurality of PCN units. The spread spectrum communications system is located within a same geographical region as occupied by an existing FDMA, proposed TDMA or any other mobile cellular 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 comb filter (333) for notch filtering predetermined channels of the mobile cellular system, a device for converting the format of the data into a form suitable for communicating over radio waves, a spread spectrum modulator for spread spectrum processing the data, and a transmitter for transmitting the spread spectrum processed converted data from the PCN-base station to a PCN unit. The PCN-base station also has an antenna; and spread spectrum detectors (334) for recovering data communicated from the PCN units. A PCN unit has an antenna (330), and a detector coupled to the antenna for recovering data communicated from PCN-base station. The detector includes a spread spectrum demodulator (334). Also, the PCN 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.
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