Broadband CDMA overlay system and method
First Claim
1. A spread-spectrum code division multiple access (CDMA) communications system for communicating data between a plurality of spread-spectrum units, said spread-spectrum CDMA communications system located within a same geographical region as occupied by a mobile-cellular system having an allocated frequency spectrum, with each cell of the mobile-cellular system having a cellular bandwidth divided into predetermined channels and having guard bands between the predetermined channels, the mobile-cellular system having cellular units communicating on the predetermined channels, said spread-spectrum CDMA communications system overlaying the cellular bandwidth and reusing the allocated frequency spectrum, comprising:
- a plurality of spread-spectrum-base stations located within the mobile-cellular system for communicating data to the plurality of spread-spectrum units, each of said spread-spectrum-base stations including,a base-modulator for converting the format of the data into a form for output to communicate over radio waves;
a base-spread-spectrum modulator for spread-spectrum-processing the converted data;
a base-transmitter for transmitting across cellular bandwidth the spread-spectrum-processed-converted data from the spread-spectrum-base station to a spread-spectrum unit as a spread-spectrum signal; and
a base-comb filter for attenuating the predetermined channels of the mobile-cellular system;
the plurality of spread-spectrum units, each of said plurality of spread-spectrum units including,a unit antenna for receiving the spread-spectrum signal as a received signal; and
a unit-spread-spectrum-receiver, coupled to said antenna, for recovering the data in the received signal communicated from said spread-spectrum signal communicated from said spread-spectrum-base station, said unit-spread-spectrum-receiver including a unit filter and a unit demodulator.
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Abstract
A spread-spectrum CDMA communications system for communicating data between a plurality of users to a plurality of spread-spectrum 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 spread-spectrum-base stations and a plurality of spread-spectrum units. A spread-spectrum-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 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 spread-spectrum-base station to a spread-spectrum unit. The spread-spectrum-base station also has an antenna, and spread-spectrum detectors for recovering data communicated from the spread-spectrum units. A spread-spectrum unit has an antenna, and a detector, including a spread-spectrum demodulator, coupled to the antenna for recovering data communicated from the spread-spectrum-base station, and the spread-spectrum unit has a spread-spectrum modulator, a transmitter, and a device for converting the format of the data for communicating over radio waves.
213 Citations
39 Claims
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1. A spread-spectrum code division multiple access (CDMA) communications system for communicating data between a plurality of spread-spectrum units, said spread-spectrum CDMA communications system located within a same geographical region as occupied by a mobile-cellular system having an allocated frequency spectrum, with each cell of the mobile-cellular system having a cellular bandwidth divided into predetermined channels and having guard bands between the predetermined channels, the mobile-cellular system having cellular units communicating on the predetermined channels, said spread-spectrum CDMA communications system overlaying the cellular bandwidth and reusing the allocated frequency spectrum, comprising:
a plurality of spread-spectrum-base stations located within the mobile-cellular system for communicating data to the plurality of spread-spectrum units, each of said spread-spectrum-base stations including, a base-modulator for converting the format of the data into a form for output to communicate over radio waves; a base-spread-spectrum modulator for spread-spectrum-processing the converted data; a base-transmitter for transmitting across cellular bandwidth the spread-spectrum-processed-converted data from the spread-spectrum-base station to a spread-spectrum unit as a spread-spectrum signal; and a base-comb filter for attenuating the predetermined channels of the mobile-cellular system; the plurality of spread-spectrum units, each of said plurality of spread-spectrum units including, a unit antenna for receiving the spread-spectrum signal as a received signal; and a unit-spread-spectrum-receiver, coupled to said antenna, for recovering the data in the received signal communicated from said spread-spectrum signal communicated from said spread-spectrum-base station, said unit-spread-spectrum-receiver including a unit filter and a unit demodulator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A spread-spectrum code division multiple access (CDMA) communications system for communicating data between spread-spectrum units, said spread-spectrum CDMA communications system located within a same geographical region as occupied by a mobile-cellular system having an allocated frequency spectrum, with each cell of the mobile-cellular system having a cellular bandwidth divided into predetermined channels and having guard bands between the predetermined channels, the mobile-cellular system having cellular users communicating on the predetermined channels, said spread-spectrum CDMA communications system overlaying the cellular bandwidth and reusing the allocated frequency spectrum, comprising:
a plurality of spread-spectrum units, located within the mobile-cellular system for communicating data to a plurality of spread-spectrum unit users, each of said plurality of spread-spectrum units including, a unit modulator for converting the data to a form for output to communicate over radio waves; a unit-spread-spectrum modulator for spread-spectrum-processing the converted data; and a unit-spread-spectrum transmitter for transmitting across the cellular bandwidth, the spread-spectrum-processed-converted data from said spread-spectrum unit to a spread-spectrum-base station as a spread-spectrum signal; said spread-spectrum-base station including, a base antenna for receiving the spread-spectrum signal; a base-comb-filter coupled to said base antenna for notch filtering the received spread-spectrum signal at the predetermined channels, reducing interference to the cellular users and to the spread-spectrum unit users such that the allocated frequency spectrum effectively supports four to eleven times an original maximum-capacity number of the cellular users as supported users, the supported users including the cellular users and the spread-spectrum unit users; and a base-spread-spectrum-receiver, coupled to said base-comb-filter, for recovering the data communicated from said spread-spectrum unit, said base-spread-spectrum receiver including a base-spread-spectrum-filter and a base spread-spectrum-demodulator. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A spread-spectrum receiver for use with a spread-spectrum-base station of a spread-spectrum code division multiple access (CDMA) communications system for communicating data between a plurality of spread-spectrum units, said spread-spectrum communications system located within a geographical area occupied by a mobile-cellular system having an allocated frequency spectrum, with each cell of the mobile-cellular system having a cellular bandwidth divided into predetermined channels and having guard bands between the predetermined channels, the mobile-cellular system having a plurality of cellular users communicating on the predetermined channels, said spread-spectrum CDMA communications system overlaying the cellular bandwidth and reusing the allocated frequency spectrum, said spread-spectrum receiver comprising:
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a base antenna; base-sector means for dividing the geographical area, within which the spread spectrum communications system is located, into six sectors, said base-sector means including a six sector antenna and control circuits for handing-off between sectors; a base-comb-filter for notch filtering a received spread-spectrum signal at the predetermined channels; and a base-detector, coupled through said base-comb-filter and said base-sector means to said base antenna, for recovering the data in the received spread-spectrum signal communicated from at least one of said plurality of spread-spectrum units. - View Dependent Claims (16)
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17. A broadband code division multiple access (B-CDMA) spread-spectrum communications system for communicating data between a plurality of spread-spectrum units, said B-CDMA spread-spectrum communications system located within a same geographical region as occupied by a mobile-cellular system having mobile-cellular units, with each cell of the mobile-cellular system having a cellular bandwidth divided into predetermined channels separated by guard bands, said mobile-cellular units communicating on the predetermined channels, said B-CDMA spread-spectrum communications system overlaying the cellular bandwidth such that a total number of the plurality of spread-spectrum units and the mobile-cellular units using the cellular bandwidth is from four to eleven times a number of original mobile-cellular units before overlay, with the number of original mobile-cellular units being close to a maximum number supportable by the mobile-cellular system, comprising:
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a plurality of spread-spectrum-base stations, each of said plurality of spread-spectrum-base stations located within a cell of the mobile-cellular system for communicating the data to the plurality of spread-spectrum units, each of said plurality of spread-spectrum-base stations having base-sector means including at least a three-sector antenna for dividing a geographical area covered by said spread-spectrum-base station into at least three sectors, with said spread-spectrum-base station, for each sector, including, base-converting means for converting the format of the data into a form for output to communicate over radio waves; base-spread-spectrum-processing means for spread-spectrum-processing the converted data; base-transmitting means for transmitting across the cellular bandwidth in a sector the spread-spectrum-processed-converted data from the spread-spectrum-base station to a spread-spectrum unit in the sector as a spread-spectrum signal; and a base comb filter for notching out the predetermined channels of the mobile-cellular system; the plurality of spread-spectrum units, each of said plurality of spread-spectrum units including, a unit antenna for receiving the spread-spectrum signal as a received signal; and a unit-spread-spectrum receiver, coupled to said unit antenna, for recovering the data in the received signal, said unit-spread-spectrum receiver including a unit filter for filtering the spread-spectrum signal and a unit demodulator for despreading the spread-spectrum signal; said base-sector means, by focusing power to the relevant sector, allowing said base-transmitting means to transmit at a reduced power level, thereby reducing a combined interfering power level from the mobile-cellular units and said spread-spectrum base station, such that cellular bandwidth capacity is increased from four to eleven times the original number of mobile-cellular units. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. A broadband code division multiple access (B-CDMA) spread spectrum communications system for communicating data between a plurality of spread-spectrum units, said B-CDMA spread-spectrum communications system located within a same geographical region as occupied by a mobile-cellular system having mobile-cellular units, with each cell of the mobile-cellular system having a cellular bandwidth divided into predetermined channels separated by guard bands, said mobile-cellular units communicating on the predetermined channels, said B-CDMA spread-spectrum communications system overlaying the cellular bandwidth such that a total number of the plurality of spread-spectrum units and mobile-cellular units using the cellular bandwidth is from four to eleven times a number of original mobile-cellular units before overlay, with the number of original mobile-cellular units being close to a maximum number supportable by the mobile-cellular system, comprising:
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the plurality of spread-spectrum units, located within the same geographical region as occupied by the mobile-cellular system for communicating the data to a plurality of users, each of said spread-spectrum units including, unit-converting means for converting data to a form for output to communicate over radio waves; unit-spread-spectrum-processing means for spread-spectrum-processing the converted data; and unit-transmitting means for transmitting, across the cellular bandwidth, the spread-spectrum-processed-converted data to a spread-spectrum-base station as a spread-spectrum signal; a spread-spectrum-base station including, a base transmitter; a base antenna for receiving the spread-spectrum signal; base-sector means coupled to said base antenna and to said base transmitter for sectoring the received spread-spectrum signal and for allowing said base transmitter to transmit at a reduced power level, thereby reducing a combined interfering power level from the mobile-cellular units and said spread-spectrum base station, such that cellularbandwidth capacity is increased from four to eleven times the number of original mobile-cellular units; base-comb-filtering means for attenuating the received spread-spectrum signal at the predetermined channels; and base-detection means, coupled to said base-sector means, for recovering the data communicated in the spread-spectrum signal, said base-detection means including base-despreading means for despreading the received spread-spectrum signal to recover the converted data. - View Dependent Claims (26, 27, 28, 29, 30)
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31. A spread-spectrum receiver for use with a spread-spectrum-base station of a spread-spectrum code division multiple access (CDMA) communications system, for communicating data between a plurality of spread-spectrum units, said spread-spectrum communications system located within a geographical area occupied by a mobile-cellular system having an allocated frequency spectrum, with each cell of the mobile-cellular system having a cellular bandwidth divided into a plurality of predetermined channels and having guard bands between said plurality of predetermined channels, the mobile-cellular system having a plurality of cellular users communicating on said plurality of predetermined channels, said spread-spectrum CDMA communications system overlaying the cellular bandwidth and reusing the allocated frequency spectrum, said spread-spectrum receiver comprising:
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a base antenna; base-sector means for dividing the geographical area, within which the spread spectrum communications system is located, into three sectors, said base-sector means including a three-sector antenna and control circuits for handing-off between sectors; base-comb-filtering means for notch filtering a received spread-spectrum signal at the plurality of predetermined channels; and base-detection means, coupled through said base-comb-filtering means and said base-sector means to said base antenna, for recovering the data in the received spread-spectrum signal communicated from one of said plurality of spread-spectrum units.
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32. A method, using a spread-spectrum code division multiple access (CDMA) communications system, for communicating data between a plurality of spread-spectrum units and a spread-spectrum-base station located with a same geographical region as occupied by a mobile-cellular system having an allocated frequency spectrum, with each cell of the mobile-cellular system having a cellular bandwidth divided into predetermined channels and having guard bands between the predetermined channels, said mobile-cellular system having cellular users communicating on the predetermined channels, said spread-spectrum CDMA communications system overlaying the cellular bandwidth and reusing the allocated frequency spectrum, said method comprising the steps of:
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sectoring a geographical area covered by a spread-spectrum-base station into at least two sectors, and from said spread-spectrum-base station and within each sector, converting the format of the data into a form for communicating over radio waves; spread-spectrum processing the converted data as a spread-spectrum-processed converted data signal; transmitting the spread-spectrum-processed converted data signal across the cellular bandwidth in an appropriate sector as a spread-spectrum signal; receiving, at a spread-spectrum unit in the appropriate sector, the spread-spectrum signal; notch filtering, at said spread-spectrum unit, the spread-spectrum signal at the predetermined channels; demodulating, at said spread-spectrum unit, the spread-spectrum signal; and recovering, at said spread-spectrum unit, the data from the spread-spectrum signal. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39)
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Specification