Spread spectrum CDMA communications system
First Claim
1. A spread spectrum CDMA communications system for communicating data between a plurality of PCN units, said spread spectrum CDMA communications system located within a same geographical region as occupied by a mobile cellular system with each cell of the mobile cellular system having a cellular bandwidth divided into predetermined channels with guard bands between the predetermined channels, and having cellular-users communicating on the predetermined channels, said spread spectrum CDMA communications system comprising:
- a plurality of PCN-base stations located within the mobile cellular system for communicating data to the plurality of PCN units, each of said plurality of PCN-base stations including,a base modulator for converting the format of the data into a form suitable for communicating over radio waves;
a pseudorandom generator for generating a selected-chip code;
a product device coupled to said pseudorandom generator and to said base modulator, for spread spectrum processing the converted data from said base modulator with the selected-chip code; and
a transmitter coupled to said product device for transmitting across the cellular bandwidth, the spread-spectrum-processed-converted data to a PCN unit;
a plurality of PCN units, each of said plurality of PCN units including,a PCN antenna; and
PCN detection means coupled to said PCN antenna and including PCN-spread-spectrum-processing means, for recovering the spread-spectrum-processed-converted data communicated from each of said plurality of PCN-base stations.
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Abstract
A spread spectrum CDMA communications system for communicating data and/or digitized voice 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 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 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 for recovering data communicated from the PCN units. A PCN unit has an antenna, and a detector coupled to the antenna for recovering 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 data into a form suitable for communicating over radio waves, a spread spectrum modulator and a transmitter.
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Citations
15 Claims
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1. A spread spectrum CDMA communications system for communicating data between a plurality of PCN units, said spread spectrum CDMA communications system located within a same geographical region as occupied by a mobile cellular system with each cell of the mobile cellular system having a cellular bandwidth divided into predetermined channels with guard bands between the predetermined channels, and having cellular-users communicating on the predetermined channels, said spread spectrum CDMA communications system comprising:
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a plurality of PCN-base stations located within the mobile cellular system for communicating data to the plurality of PCN units, each of said plurality of PCN-base stations including, a base modulator for converting the format of the data into a form suitable for communicating over radio waves; a pseudorandom generator for generating a selected-chip code; a product device coupled to said pseudorandom generator and to said base modulator, for spread spectrum processing the converted data from said base modulator with the selected-chip code; and a transmitter coupled to said product device for transmitting across the cellular bandwidth, the spread-spectrum-processed-converted data to a PCN unit; a plurality of PCN units, each of said plurality of PCN units including, a PCN antenna; and PCN detection means coupled to said PCN antenna and including PCN-spread-spectrum-processing means, for recovering the spread-spectrum-processed-converted data communicated from each of said plurality of PCN-base stations. - View Dependent Claims (2, 3, 4, 5, 11, 14, 15)
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6. A spread spectrum CDMA communications system for communicating data between a plurality of PCN units, said spread spectrum CDMA communications system located within a same geographical region as occupied by a mobile cellular system with each cell of the mobile cellular system having a cellular bandwidth divided into predetermined channels with guard bands between the predetermined channels, and having cellular-users communicating on the predetermined channels, said spread spectrum CDMA communications system comprising:
a plurality of PCN units, located within a same geographical region as occupied by a mobile cellular system for communicating data to a plurality of users, each of said plurality of PCN units including, a pseudorandom generator for generating a selected-chip code; a product device coupled to said pseudorandom generator for spread spectrum processing the data with the selected-chip code; and a transmitter for transmitting across the cellular bandwidth, the spread-spectrum-processed data to a PCN-base station; said PCN-base station including, a base antenna; a comb filter coupled to said base antenna for notch filtering the predetermined channels; and base detection means coupled to said comb filter, said base-detection means including base-spread-spectrum-processing means, for recovering the spread-spectrum-processed data communicated from each of said plurality of PCN units. - View Dependent Claims (7, 8, 9, 10)
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12. A spread-spectrum receiver for use with a PCN-base station of a spread spectrum CDMA communications system for communicating data between a plurality of PCN units, said spread spectrum CDMA communications system located within a same geographical region as occupied by a mobile cellular system with each cell of the mobile cellular system having a cellular bandwidth divided into a plurality of predetermined channels with guard bands between the plurality of predetermined channels, and having a plurality of cellular-users communicating on the plurality of predetermined channels, said spread-spectrum receiver comprising:
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a base antenna; a comb filter coupled to said base antenna for notch filtering the plurality of predetermined channels; and a detector coupled to said comb filter for recovering data communicated from said plurality of PCN units. - View Dependent Claims (13)
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Specification