Orthogonal frequency division multiplex systems
    1.
    发明授权
    Orthogonal frequency division multiplex systems 失效
    正交频分复用系统

    公开(公告)号:US6088398A

    公开(公告)日:2000-07-11

    申请号:US877160

    申请日:1997-06-17

    CPC分类号: H04L25/03834 H04L27/2602

    摘要: A method and apparatus increase a maximum available bit rate on a single data link, in order to gain capacity within single cells. An orthogonal frequency division multiplex signal is filtered by a pulse shaping operation so as to suppress side lobes of the signal. This pulse shaping introduces known inter symbol interference (ISI) and loses orthogonality between subcarriers. However, a receiver utilizes the idea of overcoming ISI by applying equalization to the signal such that the loss of orthogonality is overcome.

    摘要翻译: 一种方法和装置在单个数据链路上增加最大可用比特率,以便增加单个小区内的容量。 通过脉冲整形操作对正交频分复用信号进行滤波,以抑制信号的旁瓣。 这种脉冲整形引入了已知的符号间干扰(ISI)并丢失了子载波之间的正交性。 然而,接收机利用通过对信号进行均衡来克服ISI的想法,从而克服正交性的损失。

    Method for synchronization of transmitter and receiver at mobile radio
system
    3.
    发明授权
    Method for synchronization of transmitter and receiver at mobile radio system 失效
    移动无线电系统发射机和接收机同步的方法

    公开(公告)号:US6084871A

    公开(公告)日:2000-07-04

    申请号:US836985

    申请日:1997-08-20

    IPC分类号: H04B7/26 H04L7/08 H04L27/26

    CPC分类号: H04L27/2602

    摘要: A method of a mobile radio system for synchronization a transmitter and receiver. The system relates to MC/DS-CDMA-system. In the system information is transmitted digitally in frames. For that purpose a data channel, a pilot channel and a synchronization channel are created. In the data channel the data blocks D0, D1, D2 etc are separated by a guard space .DELTA.. In the pilot channel, respective the synchronization channel, the information is arranged in blocks which are synchronous with each other. The repeating distance, A, of the pilot channel, corresponds to the length of one of the data blocks D0, D1, D2 etc. The repeating distance for the synchronization channel is S, corresponding to a number of blocks in the data channel. In the synchronization channel information is introduced into the blocks which indicates their relation to the data channel. The method in this way allows an identification of the position of the pilot channel, which indicates the position of the synchronization channel, at which a decoding of the information of the the synchronization channel appoints the position of the data channel.

    摘要翻译: PCT No.PCT / SE95 / 01382 Sec。 371日期1997年8月20日 102(e)日期1997年8月20日PCT 1995年11月21日PCT PCT。 公开号WO96 / 17455 日期1996年6月6日一种用于同步发射机和接收机的移动无线电系统的方法。 该系统涉及MC / DS-CDMA系统。 在系统信息中以数字方式传送信息。 为此,创建数据信道,导频信道和同步信道。 在数据通道中,数据块D0,D1,D2等被保护空间DELTA隔开。 在导频信道中,对应于同步信道,信息被排列成彼此同步的块。 导频信道的重复距离A对应于数据块D0,D1,D2等中的一个的长度。同步信道的重复距离对应于数据信道中的块数。 在同步信道中,信息被引入指示它们与数据信道的关系的块中。 以这种方式,该方法允许识别指示同步信道的位置的导频信道的位置,在该位置处,同步信道的信息的解码指定数据信道的位置。

    Arrangement in a multi-user system
    4.
    发明授权
    Arrangement in a multi-user system 失效
    多用户系统中的排列

    公开(公告)号:US5784363A

    公开(公告)日:1998-07-21

    申请号:US615172

    申请日:1996-04-01

    摘要: A multi-user system includes radio channels which are independent and uncorrelated for different users. The system operates with frequencies which, due to multi-path propagation, are more or less attenuated for one user and more or less amplified for another user. Elements are arranged to detect or measure the attenuation/amplification for the different frequencies. The elements also prevent signal or information transmission at frequencies which drop below a predetermined lowest attenuation by disconnecting the frequency or frequencies in question and connecting a corresponding number of frequencies which pass the attenuation value criterion.

    摘要翻译: PCT No.PCT / SE94 / 00841 Sec。 371日期:1996年4月1日 102(e)日期1996年4月1日PCT 1994年9月12日PCT PCT。 公开号WO95 / 10144 日期1995年04月13日多用户系统包括针对不同用户的独立和不相关的无线电信道。 该系统以由多路径传播引起的频率或多或少衰减为一个用户的频率运行,并且对于另一个用户而言被放大或多或少地放大。 元件被布置为检测或测量不同频率的衰减/放大。 这些元件还通过断开所讨论的频率或频率并连接通过衰减值标准的相应数量的频率来防止在低于预定最低衰减的频率处的信号或信息传输。