IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
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| 국제특허분류(IPC7판) |
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| 출원번호 |
US-0075114
(1993-06-11)
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발명자
/ 주소 |
- Schilling Donald L. (Sands Point NY)
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| 출원인 / 주소 |
- InterDigital Technology Corporation (Wilmington DE 02)
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| 인용정보 |
피인용 횟수 :
56 인용 특허 :
0 |
초록
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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 receiver-generic mixer, a generic-
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 receiver-generic mixer, a generic-bandpass filter, a receiver-message-chip-code generator, a receiver-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 receiver-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.
대표청구항
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A spread-spectrum communications system for communicating message data comprising: first generic means for generating a generic-chip-code signal; spreading means for spread-spectrum processing the message data, synchronized with the generic chip-code signal, as spread-spectrum-processed-message data
A spread-spectrum communications system for communicating message data comprising: first generic means for generating a generic-chip-code signal; spreading means for spread-spectrum processing the message data, synchronized with the generic chip-code signal, as spread-spectrum-processed-message data; combiner means for combining the generic-chip-code signal with the spread-spectrum-processed-message data, thereby generating a base code-division-multiplex (CDM) signal; transmitter means for transmitting, using radio waves traversing free space, the CDM signal over a communications channel; detection means, coupled to said communications channel, for detecting the generic-chip-code signal embedded in the CDM signal, said detection means including, receiving means for receiving the CDM signal; second generic means, coupled to said receiving means, for detecting the generic-chip-code signal embedded in the CDM signal and for generating a replica of the first generic-chip-code signal; despreading means, synchronized with the replica of the first generic-chip-code signal, for despreading the spread-spectrum-processed-message data as a despread signal; and data detection means, synchronized with the replica of the first generic-chip-code signal, for detecting message data in the despread signal.
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