US5263045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spread spectrum conference call system and method
Assignee: InterDigital Technology Corp
•
Filing: 1991-10-21
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Granted: 1993-11-16
•
Expires: 2011-10-21
Abstract
Abstract A spread spectrum communications system for use over a communications channel, including a transmitter-generic-chip-code generator, a transmitter-message-chip-code generator, an EXCLUSIVE-OR gate, a combiner, a transmitter, a receiver-generic-chip-code generator, a generic mixer, a generic-bandpass filter, a receiver-message-chip-code generator, a message mixer, a message-bandpass filter, and a synchronous detector. The transmitter-generic-chip-code generator generates a generic-chip-code signal and the transmitter-message-chip-code generator generates a message-chip-code signal. The EXCLUSIVE-OR gate spread-spectrum processes message data with the message-chip-code signal to generate a spread-spectrum signal. The combiner combines the generic-chip-code signal with the spread-spectrum signal. The transmitter transmits the combined generic-chip-code signal and spread-spectrum signal, on a carrier signal over the communications channel as a spread-spectrum-communications signal. The receiver-generic-chip-code generator generates a replica of the generic-chip-code signal. The generic mixer recovers the carrier signal from the spread-spectrum-communications signal. The receiver-message-chip-code generator generates a replica of the message-chip-code signal. The message mixer despreads the spread-spectrum-communications signal as a modulated-data signal. The tracking and acquisition circuit uses the recovered carrier signal for synchronizing the replicas of the generic-chip-code signal to the recovered carrier signal. The synchronous detector synchronously demodulates the modulated-data signal as received data.
Inventors
- 👤 Donald L. Schilling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:01
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/30; H04W52/34; H04W52/343; G; G01; G01S; G01S13/00; G01S13/74; G01S13/82; G01S5/00; G01S5/0009; G01S5/0018; G01S5/0036; G01S5/02; G01S5/14; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/7097; H04B1/71; H04B1/7102; H04B7/00; H04B7/14; H04B7/15; H04B7/204; H04B7/216; H04B7/24; H04B7/26; H04B7/2628; H04B7/2631; H04W52/346; H04B7/185; H04B7/1853; H04B7/18545; H04B7/18547; H04J; H04J13/00; H04J13/0007; H04J13/0022; H04J13/10; H04L; H04L7/00; H04L7/02; H04L7/033; H04L7/0332; H04W4/00; H04W4/12; H04W84/00; H04W84/02; H04W84/04; H04W84/042
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
119 words
A spread-spectrum conference calling communications system for simultaneously listening to a plurality of spread-spectrum channels of a spread-spectrum-communications signal comprising: generic-spread-spectrum-processing means for recovering a carrier signal from the spread-spectrum-communications signal and for generating a replica of a generic-chip-code signal; and a plurality of spread-spectrum receivers, each of said spread-spectrum receivers including, acquisition means responsive to acquiring and tracking the recovered carrier signal for synchronizing said generic-spread-spectrum-processing means to the recovered carrier signal; message-spread-spectrum-processing means for despreading the spread-spectrum-communications signal as a plurality of modulated-data signals; and demodulation means for demodulating the modulated-data signal as a demodulated signal, said demodulation means including detection means for sequentially detecting each of the plurality of modulated-data signals as a detected signal, respectively.
Claim 2
Dependent Claim
119 words
A spread-spectrum conference calling communications system for simultaneously listening to a plurality of spread-spectrum channels of a spread-spectrum-communications signal comprising: generic-spread-spectrum-processing means for recovering a carrier signal from the spread-spectrum-communications signal and for generating a replica of a generic-chip-code signal; and a plurality of spread-spectrum receivers, each of said spread-spectrum receivers including, acquisition means responsive to acquiring and tracking the recovered carrier signal for synchronizing said generic-spread-spectrum-processing means to the recovered carrier signal; message-spread-spectrum-processing means for despreading the spread-spectrum-communications signal as a plurality of modulated-data signals; and demodulation means for demodulating the modulated-data signal as a demodulated signal, said demodulation means including detection means for sequentially detecting each of the plurality of modulated-data signals as a detected signal, respectively.
Claim 3
Dependent Claim
66 words
The spread-spectrum communications system as set forth in claim 1 wherein each of said generic-spread-spectrum-processing means includes a generic mixer for recovering the carrier signal from the spread-spectrum-communications signal; each of said message-spread-spectrum-processing means includes a message mixer for despreading the spread-spectrum-communications signal as the modulated-data signal; and each of said detection means includes an envelope detector for detecting the modulated-data signal as the detected signal.
Claim 4
Dependent Claim
31 words
The spread-spectrum communications system as set forth in claim 1 wherein detection means includes a synchronous detector responsive to the recovered-carrier signal for converting the modulated-data signal to the detected signal.
Claim 5
Dependent Claim
33 words
The spread-spectrum communications system as set forth in claim 3 wherein said detection means includes a synchronous detector responsive to the recovered-carrier signal for synchronously demodulating the modulated-data signal as a detected signal.
Claim 6
Dependent Claim
27 words
The spread-spectrum communications system as set forth in claim 3 wherein said detection means includes an envelope detector for converting the modulated-data signal to the detected signal.
Claim 7
Independent Claim
94 words
A method for receiving spread-spectrum conference calls, comprising the steps of: recovering, using a replica of a generic-chip-code signal, a carrier signal from a spread-spectrum-communications signal; acquiring and tracking the recovered-carrier signal; generating the replica of the generic-chip-code signal synchronized to the recovered-carrier signal; generating a replica of the message-chip-code signal; synchronized to the replica of the generic-chip-code signal; despreading, using the replica of the message-chip-code signal, the spread-spectrum-communications signal as a modulated-data signal; synchronizing the replica of the generic-chip-code signal to the recovered carrier signal; and demodulating the modulated-data signal as received data.
Claim 8
Independent Claim
94 words
A method for receiving spread-spectrum conference calls, comprising the steps of: recovering, using a replica of a generic-chip-code signal, a carrier signal from a spread-spectrum-communications signal; acquiring and tracking the recovered-carrier signal; generating the replica of the generic-chip-code signal synchronized to the recovered-carrier signal; generating a replica of the message-chip-code signal; synchronized to the replica of the generic-chip-code signal; despreading, using the replica of the message-chip-code signal, the spread-spectrum-communications signal as a modulated-data signal; synchronizing the replica of the generic-chip-code signal to the recovered carrier signal; and demodulating the modulated-data signal as received data.
Claim 9
Dependent Claim
27 words
The method as set forth in claim 6 wherein the demodulating step includes synchronously demodulating, using the recovered carrier signal, the modulated-data signal as a detected signal.
Claim 10
Dependent Claim
98 words
A spread-spectrum conference calling communications system for simultaneously listening to a plurality of spread-spectrum channels of a spread-spectrum-communications signal comprising: generic-spread-spectrum-processing means for recovering a carrier signal from the spread-spectrum-communications signal and for generating a replica of a generic-chip-code signal; and a plurality of spread-spectrum receivers, each of said spread-spectrum receivers including, acquisition means responsive to acquiring and tracking the recovered carrier signal for synchronizing said generic-spread-spectrum-processing means to the recovered carrier signal; message-spread-spectrum-processing means for despreading the spread-spectrum-communications signal as a plurality of modulated-data signals; and demodulation means for demodulating the modulated-data signal as a demodulated signal.
Claim 11
Dependent Claim
98 words
A spread-spectrum conference calling communications system for simultaneously listening to a plurality of spread-spectrum channels of a spread-spectrum-communications signal comprising: generic-spread-spectrum-processing means for recovering a carrier signal from the spread-spectrum-communications signal and for generating a replica of a generic-chip-code signal; and a plurality of spread-spectrum receivers, each of said spread-spectrum receivers including, acquisition means responsive to acquiring and tracking the recovered carrier signal for synchronizing said generic-spread-spectrum-processing means to the recovered carrier signal; message-spread-spectrum-processing means for despreading the spread-spectrum-communications signal as a plurality of modulated-data signals; and demodulation means for demodulating the modulated-data signal as a demodulated signal.
Claim 12
Dependent Claim
29 words
The spread-spectrum communications system as set forth in claim 8 wherein each of said demodulation means further includes detection means for converting a modulated-data signal to a detected signal.
Claim 13
Dependent Claim
31 words
The spread-spectrum communications system as set forth in claim 9 wherein each of said demodulation means further includes bit-synchronization means for integrating and dumping the detected signal as the demodulated signal.
Claim 14
Dependent Claim
34 words
The spread-spectrum communication system as set forth in claim 10 wherein each of said plurality of spread-spectrum receivers further includes combiner means for combining each of the demodulated signals to generate a received-message signal.
Claim 15
Dependent Claim
36 words
The spread-spectrum communications system as set forth in claim 11 wherein each of said plurality of spread-spectrum receivers further includes switching means for switching the demodulation means between the message-spread-spectrum-processing means and the combining means, respectively.
Claim 16
Dependent Claim
103 words
A spread-spectrum conference calling communications system for simultaneously listening to a plurality of spread-spectrum channels of a spread-spectrum-communications signal comprising: a receiver-generic-chip-code generator for recovering a carrier signal from the spread-spectrum-communications signal and for generating a replica of a generic-chip-code signal; and a plurality of spread-spectrum receivers, each of said spread-spectrum receivers including, an acquisition and tracking circuit, responsive to acquiring and tracking the recovered carrier signal, for synchronizing said receiver-generic-chip-code generator to the recovered carrier signal; a receiver-message-chip-code generator for despreading the spread-spectrum-communications signal as a plurality of modulated-data signals; and demodulation means for demodulating the modulated-data signal as a demodulated signal.
Claim 17
Dependent Claim
103 words
A spread-spectrum conference calling communications system for simultaneously listening to a plurality of spread-spectrum channels of a spread-spectrum-communications signal comprising: a receiver-generic-chip-code generator for recovering a carrier signal from the spread-spectrum-communications signal and for generating a replica of a generic-chip-code signal; and a plurality of spread-spectrum receivers, each of said spread-spectrum receivers including, an acquisition and tracking circuit, responsive to acquiring and tracking the recovered carrier signal, for synchronizing said receiver-generic-chip-code generator to the recovered carrier signal; a receiver-message-chip-code generator for despreading the spread-spectrum-communications signal as a plurality of modulated-data signals; and demodulation means for demodulating the modulated-data signal as a demodulated signal.
Claim 18
Dependent Claim
30 words
The spread-spectrum communications system as set forth in claim 13 wherein each of said demodulation means further includes a data detector for converting a modulated-data signal to a detected signal.
Claim 19
Dependent Claim
32 words
The spread-spectrum communications system as set forth in claim 14 wherein each of said demodulation means further includes a bit synchronizer for integrating and dumping the detected signal as the demodulated signal.
Claim 20
Dependent Claim
34 words
The spread-spectrum communication system as set forth in claim 15 wherein each of said plurality of spread-spectrum receivers further includes a combiner for combining each of the demodulated signals to generate a received-message signal.
Claim 21
Dependent Claim
35 words
The spread-spectrum communications system as set forth in claim 16 wherein each of said plurality of spread-spectrum receivers further includes a switch for switching the demodulation means between the receiver-message-chip-code generator and the combiner, respectively.
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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) | 1996-11-15 | 1997-05-17 | 1997-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-15 | 2001-05-17 | 2001-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-15 | 2005-05-17 | 2005-11-16 | $7700.00 | Window Closed / Lapsed |