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公开(公告)号:US5444712A
公开(公告)日:1995-08-22
申请号:US113113
申请日:1993-08-30
申请人: William L. Betts , Eran Cohen , Joseph A. Crupi , Cletus L. Gardenhour , Andrew T. Weitzner , Jean-Jacques Werner
发明人: William L. Betts , Eran Cohen , Joseph A. Crupi , Cletus L. Gardenhour , Andrew T. Weitzner , Jean-Jacques Werner
CPC分类号: H04L27/34
摘要: A technique for use in communications systems utilizing busy and idle modes. In the busy mode, symbols representative of data are transmitted to system end users. In the idle mode, during which no data is communicated to end users, idle mode symbols are transmitted. Such idle mode symbols are not used to represent data and are only transmitted during the idle mode. Advantageously, such idle mode symbols maintain adaptive apparatus, such as AGC circuits, NEXT cancellers and equalizers, in their properly converged state. In the disclosed embodiment, the idle mode symbols are the innermost symbols in a signal constellation and transition from the idle to busy mode is represented by the transmission of a predetermined number of outermost symbols in the signal constellation. Use of such symbols for idle-to-busy mode transitions advantageously provides ready detection of such transitions. In addition, use of the innermost symbols for the idle mode reduces spectral emission and crosstalk.
摘要翻译: 一种在使用忙碌和空闲模式的通信系统中使用的技术。 在忙模式下,代表数据的符号被发送给系统终端用户。 在空闲模式中,在此期间没有数据传送给终端用户,发送空闲模式符号。 这种空闲模式符号不用于表示数据,并且仅在空闲模式期间传输。 有利的是,这种空闲模式符号在自适应收敛状态下保持自适应装置,例如AGC电路,NEXT消除器和均衡器。 在所公开的实施例中,空闲模式符号是信号星座中的最内符号,并且从空闲模式到忙模式的转换由信号星座图中预定数量的最外边符号的传输来表示。 使用这种符号进行空闲到忙模式转换有利地提供了对这种转换的即时检测。 此外,对于空闲模式使用最内部的符号减少了频谱发射和串扰。
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公开(公告)号:US5541964A
公开(公告)日:1996-07-30
申请号:US533143
申请日:1995-09-25
CPC分类号: H04L27/34 , H04L2007/045
摘要: Symbols which are representative of customer data are transmitted in bursts. In the idle mode, i.e., the time intervals between bursts, symbol sequences which are a priori known to the receiver are transmitted. Such idle mode symbols maintain adaptive apparatus, such as NEXT cancellers and equalizers, in their properly converged state. To reduce crosstalk and spectral emissions, the idle mode symbols are selected to be the innermost symbols in the signal constellation encompassing the ensemble of all symbols.
摘要翻译: 以突发方式传送代表客户数据的符号。 在空闲模式下,即突发之间的时间间隔,发送接收机已知的先验符号序列。 这种空闲模式符号在自适应收敛状态下保持自适应装置,例如NEXT消除器和均衡器。 为了减少串扰和频谱发射,空闲模式符号被选择为包含所有符号的集合的信号星座中的最内部符号。
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