Code division multiplex satellite broadcasting system
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04J-011/00
H04B-071/85
H04B-072/16
출원번호
US-0220722
(1998-12-24)
발명자
/ 주소
Sayeed, Zulfiquar
Weerackody, Vijitha
출원인 / 주소
Agere Systems Inc.
대리인 / 주소
Ryan, Mason & Lewis, LLP
인용정보
피인용 횟수 :
5인용 특허 :
10
초록▼
A CDM satellite transmission system that broadcasts programming content, such as audio or video information, using two geo-synchronous satellites and a plurality of terrestrial repeaters based on Code division multiple access [(CDMA)] technology is disclosed. A plurality of programming channels is m
A CDM satellite transmission system that broadcasts programming content, such as audio or video information, using two geo-synchronous satellites and a plurality of terrestrial repeaters based on Code division multiple access [(CDMA)] technology is disclosed. A plurality of programming channels is multiplexed onto a carrier frequency using Code division multiple access [(CDMA)] technology. A delayed version of the signal is transmitted with the on-time version of the programming content to accommodate uninterrupted reception in the event of a blockage. The on-time and delayed version of each information channel is transmitted by each of the satellites and repeaters, providing additional diversity gains. Thus, the satellites and terrestrial repeaters occupy the entire available bandwidth. CDM transmissions are used where the pseudo-noise sequences are the same, or linear translates of one another. The terrestrial repeaters have a direct line of sight to at least one satellite and repeat the transmission of only one satellite.
대표청구항▼
A CDM satellite transmission system that broadcasts programming content, such as audio or video information, using two geo-synchronous satellites and a plurality of terrestrial repeaters based on Code division multiple access [(CDMA)] technology is disclosed. A plurality of programming channels is m
A CDM satellite transmission system that broadcasts programming content, such as audio or video information, using two geo-synchronous satellites and a plurality of terrestrial repeaters based on Code division multiple access [(CDMA)] technology is disclosed. A plurality of programming channels is multiplexed onto a carrier frequency using Code division multiple access [(CDMA)] technology. A delayed version of the signal is transmitted with the on-time version of the programming content to accommodate uninterrupted reception in the event of a blockage. The on-time and delayed version of each information channel is transmitted by each of the satellites and repeaters, providing additional diversity gains. Thus, the satellites and terrestrial repeaters occupy the entire available bandwidth. CDM transmissions are used where the pseudo-noise sequences are the same, or linear translates of one another. The terrestrial repeaters have a direct line of sight to at least one satellite and repeat the transmission of only one satellite. n claim 1, wherein the opening cover fastening means comprises:a pair of coupling ribs formed on an opening cover attaching portion of the cartridge case; andrib recesses, formed in the opening cover, to receive the coupling ribs, respectively.3. The cartridge as claimed in claim 1, wherein;the cartridge case comprises a sensing hole to sense a state of the information recording medium and a movement hole; andthe opening cover comprises an opening/closing unit to selectively open and close the sensing hole, the opening/closing unit includinga rotary arm movably disposed about a pivot point on the opening cover, and at a position corresponding to the movement hole when the opening cover is attached to the cartridge case,a tension lever to movably support the rotary arm and bias the rotary arm to an initial position.a stopping projection formed on the rotary arm, anda stopping rib formed on the opening cover adjacent to a place corresponding to the sensing hole when the opening cover is attached to the cartridge case;wherein the stopping rib stops the stopping projection in response to the rotary arm being moved to the sensing hole to maintain the rotary arm in place, and the stopping projection releases from the stopping rib so that the rotary arm returns to the initial position by the tension lever in response to the rotary arm being pushed.4. The cartridge as claimed in claim 3, wherein the sensing hole is an A1 hole is indicative of whether the disc has been exchanged with regard to the cartridge case.5. The cartridge as claimed in claim 1, wherein:the cartridge case comprises a plurality of sensing holes to sense a state of the information recording medium and a corresponding plurality of movement holes; andthe opening cover comprises an opening/closing unit to selectively open and close the sensing holes, the opening/closing unit includinga plurality of rotary arms movably disposed about respective pivot points on the opening cover, and at positions corresponding to the movement holes when the opening cover is attached to the cartridge case,a plurality of tension levers to movably support the corresponding rotary arms and bias the rotary arms to corresponding initial positions,a plurality of stopping projections formed on the corresponding rotary arms, anda plurality of stopping ribs formed on the opening cover adjacent to places corresponding to the sensing holes when the opening cover is attached to the cartridge case;wherein each stopping rib stops the corresponding stopping projection in response to the corresponding rotary arm being moved to the corresponding sensing hole to maintain the rotary arm in place, and the stopping projection releases from the stopping rib so that the rotary arm returns to the initial position by the tension lever in response to the rotary arm being pushed.6. A cartridge for an information recording medium, comprising: a cartridge case having an opening to receive the information recording medium;an opening cover, detachably mounted to the cartridge case at the opening, to enable the information recording medium to be withdrawn or inserted with respect to the cartridge case, the opening cover having supporting ribs to support the information recording medium on an inner surface thereof;a pair of elastic pressure parts, elastically formed on the opening cover, to elastically support the information recording medium to hold the information recording medium relative to the opening cover when the opening cover is not attached to the cartridge case;receiving ribs integrally formed on leading ends of the pair of elastic pressure parts, respectively; andintervening members, formed on opposite inner sidewalls of the cartridge case, to slidably contact the receiving ribs, respecti
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이 특허에 인용된 특허 (10)
Lomp Gary ; Ozluturk Fatih ; Silverberg Avi, Code sequence generator in a CDMA modem.
Briskman Robert D. (North Bethesda MD), Mobile radio receivers using time diversity to avoid service outages in multichannel broadcast transmission systems.
Briskman Robert D. (Bethesda MD) Seavey John M. (Cohasset MA) Medeiros Paul (Fall River MA), Radio frequency broadcasting systems and methods using two low-cost geosynchronous satellites and hemispherical coverage.
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