US5228053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spread spectrum cellular overlay CDMA communications system
Assignee: InterDigital Technology Corp
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Filing: 1991-10-17
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Granted: 1993-07-13
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Expires: 2011-10-17
Abstract
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.
Inventors
- 👤 Frank Miller
- 👤 Donald L. Schilling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:51
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/30; H04W52/34; H04W52/343; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/7097; H04B1/71; H04B7/00; H04B7/24; H04B7/26; H04B7/2628; H04W52/346
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
236 words
A spread spectrum code division multiple access (CDMA) communications system for communicating message data between a plurality of personal communications network (PCN) units, said spread spectrum communications system located within a same geographical region as occupied by a pre-existing communications system using a pre-existing-system frequency and a pre-existing-system bandwidth, said spread spectrum CDMA communications system comprising: a plurality of PCN-base stations located within the same geographical area as occupied by the pre-existing communications system for communicating message data to the plurality of PCN units, each of said PCN-base stations including, base means for converting the format of the message data for communicating over radio waves; base-product means for spread spectrum processing the converted message data with a spread-spectrum bandwidth of at least 30 MHz; and base means for transmitting across the pre-existing-system bandwidth, the spread-spectrum-processed-converted message data from the PCN-base station to a PCN unit; a plurality of PCN units, each of said PCN units including, a PCN antenna; and PCN detection means coupled to said PCN antenna and including PCN-spread-spectrum-processing means, for recovering message data communicated from said PCN-base station; and wherein said plurality of PCN-base stations are geographically spaced with the power radiated by each base-transmitting means within a respective microcell varies inversely with distance by an exponent of approximately two, and with the power radiated by each base-transmitting means outside a respective microcell varies inversely with distance by an exponent greater that two.
Claim 2
Dependent Claim
236 words
A spread spectrum code division multiple access (CDMA) communications system for communicating message data between a plurality of personal communications network (PCN) units, said spread spectrum communications system located within a same geographical region as occupied by a pre-existing communications system using a pre-existing-system frequency and a pre-existing-system bandwidth, said spread spectrum CDMA communications system comprising: a plurality of PCN-base stations located within the same geographical area as occupied by the pre-existing communications system for communicating message data to the plurality of PCN units, each of said PCN-base stations including, base means for converting the format of the message data for communicating over radio waves; base-product means for spread spectrum processing the converted message data with a spread-spectrum bandwidth of at least 30 MHz; and base means for transmitting across the pre-existing-system bandwidth, the spread-spectrum-processed-converted message data from the PCN-base station to a PCN unit; a plurality of PCN units, each of said PCN units including, a PCN antenna; and PCN detection means coupled to said PCN antenna and including PCN-spread-spectrum-processing means, for recovering message data communicated from said PCN-base station; and wherein said plurality of PCN-base stations are geographically spaced with the power radiated by each base-transmitting means within a respective microcell varies inversely with distance by an exponent of approximately two, and with the power radiated by each base-transmitting means outside a respective microcell varies inversely with distance by an exponent greater that two.
Claim 3
Dependent Claim
31 words
The spread spectrum communications system as set forth in claim 1 wherein said PCN detection means includes means for converting the format of the message data for output to a user.
Claim 4
Dependent Claim
42 words
The spread spectrum communications system as set forth in claim 1 wherein said PCN-spread-spectrum-processing means includes means for storing a local chip code for comparison to signals received for recovering the message data sent from said PCN-base station to said PCN unit.
Claim 5
Dependent Claim
25 words
The spread spectrum communications system as set forth in claim 1 wherein said PCN-spread-spectrum-processing means includes means for synchronizing said PCN-spread-spectrum-processing means to received signals.
Claim 6
Dependent Claim
35 words
The spread spectrum communications system as set forth in claim 1 wherein said base-product means at said PCN-base station includes means for processing the message data for particular PCN units with a selected chip code.
Claim 7
Dependent Claim
211 words
A spread spectrum code division multiple access (CDMA) communications system for communicating message data between a plurality of personal communication network (PCN) units, said spread spectrum communications system located within a same geographical region as occupied by a pre-existing communications system using a pre-existing-system frequency and a pre-existing-system bandwidth, said spread spectrum CDMA communications system comprising: a plurality of PCN units, located within the same geographical region as occupied by the pre-existing communications system for communicating message data to a plurality of users, each of said PCN units including, PCN-product means for spread spectrum processing the message data with a spread-spectrum bandwidth of at least 30 MHz; and PCN means for transmitting across the pre-existing-system bandwidth, the spread-spectrum-processed-converted message data from said PCN unit to a PCN-base station; a plurality of PCN-base stations, each PCN-base station including: a base antenna; and base detection means including base-spread-spectrum-processing means, for recovering message data communicated from said PCN unit; and wherein said plurality of PCN-base stations are geographically spaced with the power radiated by each base-transmitting means within a respective microcell varies inversely with distance by an exponent of approximately two, and with the power radiated by each base-transmitting means outside a respective microcell varies inversely with distance by an exponent greater that two.
Claim 8
Dependent Claim
211 words
A spread spectrum code division multiple access (CDMA) communications system for communicating message data between a plurality of personal communication network (PCN) units, said spread spectrum communications system located within a same geographical region as occupied by a pre-existing communications system using a pre-existing-system frequency and a pre-existing-system bandwidth, said spread spectrum CDMA communications system comprising: a plurality of PCN units, located within the same geographical region as occupied by the pre-existing communications system for communicating message data to a plurality of users, each of said PCN units including, PCN-product means for spread spectrum processing the message data with a spread-spectrum bandwidth of at least 30 MHz; and PCN means for transmitting across the pre-existing-system bandwidth, the spread-spectrum-processed-converted message data from said PCN unit to a PCN-base station; a plurality of PCN-base stations, each PCN-base station including: a base antenna; and base detection means including base-spread-spectrum-processing means, for recovering message data communicated from said PCN unit; and wherein said plurality of PCN-base stations are geographically spaced with the power radiated by each base-transmitting means within a respective microcell varies inversely with distance by an exponent of approximately two, and with the power radiated by each base-transmitting means outside a respective microcell varies inversely with distance by an exponent greater that two.
Claim 9
Dependent Claim
33 words
The spread spectrum communications system as set forth in claim 6 wherein said base detection mens includes means for converting the format of the message data into a form suitable for a user.
Claim 10
Dependent Claim
41 words
The spread spectrum communications system as set forth in claim 6 wherein said base-spread-spectrum-processing means includes means for storing a local chip code for comparison to signals received for recovering message data sent from said PCN-base station to said PCN unit.
Claim 11
Dependent Claim
25 words
The spread spectrum communications system as set forth in claim 6 wherein said base-spread-spectrum-processing means includes means for synchronizing said processing means to received signals.
Claim 12
Dependent Claim
33 words
The spread spectrum communications system as set forth in claim 6 wherein said base-spread-spectrum-processing means at said PCN-base station includes means for processing message data for particular PCN units with a selected-chip code.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-12 | 1997-01-11 | 1997-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-12 | 2001-01-11 | 2001-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-12 | 2005-01-11 | 2005-07-13 | $7700.00 | Window Closed / Lapsed |