Method and system for distribution of wireless digital multimedia
signals in a cellular pattern
    1.
    发明授权
    Method and system for distribution of wireless digital multimedia signals in a cellular pattern 失效
    蜂窝图案中无线数字多媒体信号分配的方法和系统

    公开(公告)号:US5878324A

    公开(公告)日:1999-03-02

    申请号:US569270

    申请日:1995-12-08

    IPC分类号: H04H20/72 H04N7/00 H04H1/00

    CPC分类号: H04H20/72 H04N7/002

    摘要: A system (200) and method (300) provide an efficient communication system for distributing digital multimedia/HDTV signals to multimedia units in a cellular pattern. The method includes: 1) using at least a first primary wide area-antenna for, where selected, transmitting a digital multimedia/HDTV signal per frequency allocation over at least a portion of a predetermined reception area, wherein a plurality of patterns of cells tesselates the predetermined reception area; and 2) using cell-site antennas having transmitters, each located in a cell, for, where selected, transmitting, when the primary wide area-antenna is deselected, at least a first preselected digital multimedia/HDTV signal over an area of the cell, for providing the HDTV signal to a plurality of digital receivers in accordance with a predetermined scheme, wherein the digital multimedia/HDTV signal is associated with a predetermined frequency allocation.

    摘要翻译: 一种系统(200)和方法(300)提供了一种用于将数字多媒体/ HDTV信号以蜂窝模式分发到多媒体单元的有效的通信系统。 该方法包括:1)至少使用第一主广域天线,用于在选定的情况下,通过在预定接收区域的至少一部分上每频率分配发送数字多媒体/ HDTV信号,其中多个单元格模式镶嵌 预定接收区域; 以及2)使用具有发射机的小区站点天线,每个发射机位于小区中,在被选择的情况下,当主广域天线被取消选择时,至少在小区的区域上的第一预选数字多媒体/ HDTV信号 用于根据预定方案向多个数字接收机提供HDTV信号,其中数字多媒体/ HDTV信号与预定的频率分配相关联。

    System and method for calculating a state transition metric in a viterbi
equalizer
    2.
    发明授权
    System and method for calculating a state transition metric in a viterbi equalizer 失效
    用于计算维特比均衡器中的状态转换度量的系统和方法

    公开(公告)号:US6111923A

    公开(公告)日:2000-08-29

    申请号:US600562

    申请日:1996-02-13

    摘要: A system and method for calculating survivor metrics in a Viterbi equalizer of a receiver, such as a receiver operative to receive a PSK-modulated signal, for example, a .pi./4, differential, phase-shift-keying, modulated signal. The state transition metric, defined as a function of two successive states, is converted into a function defined by pairwise differences between allowable symbols of a PSK-modulated signal. When operative to receive the .pi./4 DQPSK-modulated signal, the number of calculations required to calculate state transition metrics is reduced significantly.

    摘要翻译: 一种用于计算接收机的维特比均衡器中的幸存度量的系统和方法,诸如接收PSK调制信号(例如,pi / 4,差分,相移键控)调制信号的接收机。 定义为两个连续状态的函数的状态转换度量被转换为由PSK调制信号的可允许符号之间的成对差异定义的函数。 当操作以接收pi / 4 DQPSK调制信号时,计算状态转换度量所需的计算次数显着降低。