IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0360059
(1999-07-23)
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발명자
/ 주소 |
- Gilhousen, Klein S.
- Jacobs, Irwin M.
- Padovani, Roberto
- Weaver, Jr., Lindsay A.
- Wheatley, III, Charles E.
- Viterbi, Andrew J.
|
출원인 / 주소 |
|
대리인 / 주소 |
Miller, Russell B.Edwards, Christopher
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인용정보 |
피인용 횟수 :
17 인용 특허 :
94 |
초록
▼
A system and method for communicating information signals using spread spectrum communication techniques. PN sequences are constructed that provide orthogonality between the users so that mutual interference will be reduced, allowing higher capacity and better link performance. With orthogonal PN co
A system and method for communicating information signals using spread spectrum communication techniques. PN sequences are constructed that provide orthogonality between the users so that mutual interference will be reduced, allowing higher capacity and better link performance. With orthogonal PN codes, the cross-correlation is zero over a predetermined time interval, resulting in no interference between the orthogonal codes, provided only that the code time frames are time aligned; with each other. In an exemplary embodiment, signals are communicated between a cell-site and mobile units using direct sequence spread spectrum communication signals. In the cell-to-mobile link, pilot, sync, paging and voice channels are defined. Information communicated on the cell-to-mobile link channels are, in general, encoded, interleaved, bi-phase shift key (BPSK) modulated with orthogonal covering of each BPSK symbol along with quadrature phase shift key (QPSK) spreading of the covered symbols. In the mobile-to-cell link, access and voice channels are defined. Information communicated on the mobile-to-cell link channels are, in general, encoded, interleaved, orthogonal signaling along with QPSK spreading.
대표청구항
▼
A system and method for communicating information signals using spread spectrum communication techniques. PN sequences are constructed that provide orthogonality between the users so that mutual interference will be reduced, allowing higher capacity and better link performance. With orthogonal PN co
A system and method for communicating information signals using spread spectrum communication techniques. PN sequences are constructed that provide orthogonality between the users so that mutual interference will be reduced, allowing higher capacity and better link performance. With orthogonal PN codes, the cross-correlation is zero over a predetermined time interval, resulting in no interference between the orthogonal codes, provided only that the code time frames are time aligned; with each other. In an exemplary embodiment, signals are communicated between a cell-site and mobile units using direct sequence spread spectrum communication signals. In the cell-to-mobile link, pilot, sync, paging and voice channels are defined. Information communicated on the cell-to-mobile link channels are, in general, encoded, interleaved, bi-phase shift key (BPSK) modulated with orthogonal covering of each BPSK symbol along with quadrature phase shift key (QPSK) spreading of the covered symbols. In the mobile-to-cell link, access and voice channels are defined. Information communicated on the mobile-to-cell link channels are, in general, encoded, interleaved, orthogonal signaling along with QPSK spreading. aid spacer layer comprises a polymer. 18. The device of claim 17, wherein said spacer layer is from about 25 to 45 μm thick. 19. The device of claim 1, wherein said spacer layer is from about 1 to 500 μm thick. 20. The device of claim 1, wherein said spacer layer is from about 10 to 100 μm thick. 21. A method of manufacturing a vertical cavity surface emitting laser comprising the steps of: forming a first portion that emits light, comprising at least one first quantum well; forming a spacer layer comprising a material that is transmissive and expansive of light emitted from said first portion; forming a second portion comprising at least one second quantum well; wherein said second portion is positioned over said spacer layer and said spacer layer is positioned over said first portion. 22. The method of claim 21, wherein said first portion is formed on a first substrate, and said second portion is formed on a second substrate. 23. The method of claim 22, further comprising the step of securing said first portion to said second portion. 24. The method of claim 21, further comprising the step of forming fixed spacers on the top surface of said first portion.
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