发明授权
US5416797A System and method for generating signal waveforms in a CDMA cellular
telephone system
失效
用于在CDMA蜂窝电话系统中产生信号波形的系统和方法
- 专利标题: System and method for generating signal waveforms in a CDMA cellular telephone system
- 专利标题(中): 用于在CDMA蜂窝电话系统中产生信号波形的系统和方法
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申请号: US825147申请日: 1992-01-24
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公开(公告)号: US5416797A公开(公告)日: 1995-05-16
- 发明人: Klein S. Gilhousen , Irwin M. Jacobs , Roberto Padovani , Lindsay A. Weaver, Jr. , Andrew J. Viterbi
- 申请人: Klein S. Gilhousen , Irwin M. Jacobs , Roberto Padovani , Lindsay A. Weaver, Jr. , Andrew J. Viterbi
- 申请人地址: CA San Diego
- 专利权人: Qualcomm Incorporated
- 当前专利权人: Qualcomm Incorporated
- 当前专利权人地址: CA San Diego
- 主分类号: H04B1/707
- IPC分类号: H04B1/707 ; H04B1/7075 ; H04B1/709 ; H04B1/7115 ; H04B7/005 ; H04B7/26 ; H04J3/02 ; H04J3/16 ; H04J3/22 ; H04J11/00 ; H04J13/00 ; H04J13/10 ; H04J13/18 ; H04L20060101 ; H04L1/00 ; H04L1/06 ; H04L1/08 ; H04L5/02 ; H04L5/12 ; H04L23/02 ; H04L27/30 ; H04W52/26
摘要:
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, hi-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.
公开/授权文献
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