[특허]Methods of and devices for enhancing communications that use spread spectrum technology

Methods of and devices for enhancing communications that use spread spectrum technology 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H03M-013/00
출원번호	US-0236744 (1994-04-29)
발명자 / 주소	Seshadri Nambirajan Sundberg Carl-Erik Wilhelm
출원인 / 주소	Lucent Technologies, Inc.
인용정보	피인용 횟수 : 38 인용 특허 : 0

초록 ▼

We have invented methods of and devices for introducing unequal error protection into spread spectrum communication systems. One embodiment of the invention addresses certain inefficiencies of the standard known as IS-95 used, for example, in some mobile direct sequence code division multiple access ("DS-CDMA") phone systems. The invention allows for increased system capacity and/or improved quality. More specifically, spread spectrum multiple access ("SSMA") coding may be combined with the concept of unequal error protection ("UEP"), resulting in an UEP SSMA coding process. IS-95, in order to make significant portions of a signal highly immune to errors, has imposed the same high degree of error immunity on less significant portions of the signal (when, in fact, a lower degree would suffice) and, thus, wastes bandwidth. The present invention's coding process (i.e., UEP SSMA) utilizes bandwidth in a closer to optimal manner than known methods.

대표청구항 ▼

[ What we claim is:] [15.] In an apparatus for processing a signal, the apparatus including means for applying a spread spectrum encoding process to the signal, the improvement comprising:means for applying a first error protection process to at least one more significant portion of the signal and a second error protection process to at least one less significant portion of the signal wherein the first error protection process provides a greater amount of error protection than the second error protection process, the means for applying comprising:(a) means for applying a variable time modulator; and(b) means for applying a variable rate coder.

이 특허를 인용한 특허 (38)

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Park Su-Won,KRX, Apparatus and methods for puncturing and recovering code in spread spectrum communication system.
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Lomp, Gary R.; Ozluturk, Faith M.; Kowalski, John, Automatic power control system for a code division multiple access (CDMA) communications system.
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Kim, Young-Ky; Ahn, Jae-Min; Yoon, Soon-Young; Kang, Hee-Won; Lee, Hyun-Suk; Park, Jin-Soo; Kim, Jae-Yoel, Device and method for exchanging frame messages of different lengths in CDMA communication system.
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Lomp, Gary R.; Ozluturk, Faith, Efficient multipath centroid tracking circuit for a code division multiple access (CDMA) system.
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Li, Jifeng, Error-correcting encoding apparatus.
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Li, Jifeng, Error-correcting encoding apparatus.
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Li, Jifeng, Error-correcting encoding apparatus.
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Li,Jifeng, Error-correcting encoding apparatus with variable-rate puncturing.
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Divsalar, Dariush; McEliece, Robert J.; Jin, Hui; Pollara, Fabrizio, Interleaved serial concatenation forming turbo-like codes.
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Divsalar,Dariush; McEliece,Robert J.; Jin,Hui; Pollara,Fabrizio, Interleaved serial concatenation forming turbo-like codes.
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Ozluturk, Fatih; Lomp, Gary R.; Kowalski, John, Method and apparatus for adaptive power control for spread-spectrum communications.
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Doetsch, Markus; Jung, Peter; Plechinger, Jorg; Schmidt, Peter; Schneider, Michael; Kella, Tideya, Method and apparatus for producing spread-coded signals.
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Schiff Leonard N., Method and apparatus for reducing frame error rate through signal power adjustment.
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Ozluturk, Fatih; Lomp, Gary, Method and subscriber unit for performing power control.
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Seshadri Nambirajan ; Sundberg Carl-Erik Wilhelm, Methods of and devices for enhancing communications that use spread spectrum technology by using variable power techniques.
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Jin, Hui; Khandekar, Aamod; McEliece, Robert J., Serial concatenation of interleaved convolutional codes forming turbo-like codes.
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Jin,Hui; Khandekar,Aamod; McEliece,Robert J., Serial concatenation of interleaved convolutional codes forming turbo-like codes.
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Jin,Hui; Khandekar,Aamod; McEliece,Robert J., Serial concatenation of interleaved convolutional codes forming turbo-like codes.
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Cook, Charles I.; Fargano, Michael J.; Russo, Blake; Doherty, Thomas P., System and method for OTA over CDMA data channel.
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Jones, Vincent K.; Pollack, Michael; Raleigh, Gregory G., Systems and methods for improved medium access control messaging.
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IPC	Description
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A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Methods of and devices for enhancing communications that use spread spectrum technology 원문보기

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Methods of and devices for enhancing communications that use spread spectrum technology 원문보기

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이 특허를 인용한 특허 (38)

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