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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0543496 (1990-06-25) |
발명자 / 주소 |
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출원인 / 주소 |
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인용정보 | 피인용 횟수 : 1496 인용 특허 : 0 |
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 signalling along with QPSK spreading.
A system for modulating an information signal in a spread spectrum communication system, comprising: means for generating an orthogonal function signal representative of an orthogonal function selected from a plurality of orthogonal functions; means for generating a pseudorandom noise (PN) signal of
A system for modulating an information signal in a spread spectrum communication system, comprising: means for generating an orthogonal function signal representative of an orthogonal function selected from a plurality of orthogonal functions; means for generating a pseudorandom noise (PN) signal of a predetermined PN code; means for combining said orthogonal function signal, said PN signal and an information signal, and for providing a resultant first modulation signal.
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