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1. 发明公开

EP0915574A1 Power line communication system 失效
标题翻译：电力线通信系统
公开(公告)号：EP0915574A1
公开(公告)日：1999-05-12
申请号：EP97308761.2
申请日：1997-10-31
申请人： GENERAL ELECTRIC COMPANY
发明人： Hershey, John Erik , Korkosz, Richard August , Saulnier, Gary Jude , Gaus, Richard Charles, Jr. , Welles, Kenneth Brakeley, II
IPC分类号： H04B3/54 , H04L1/04 , H04L27/26
CPC分类号： H04L1/04 , H04B3/54 , H04B2203/5416 , H04B2203/5495 , H04L5/06
摘要： A system for communicating digital information over wires having a great deal of harmonic distortion, such as a power line, employs a transmitter (10) which transmitter which creates (3) a carrier wave for each of a plurality of signals to be sent. This carrier wave has frequency lobes positioned between the frequency lobes of the harmonic distortion. Each of the lobes o a single carrier signal is encoded (19) with the same bit value during a given bit period. This signal is then mixed (18) with any existing signal on the wire. At a remote receiver coupled to the wires, the signal is sensed, filtered, and Fourier transformed into coefficients. The signal-to-noise (S/N) ratio of each Fourier coefficient is determined by a novel S/N estimation technique. The coefficients are weighted based upon the S/N ratio estimation, and decoded, preferably by an inner product of the weighted Fourier coefficients. Additionally, the S/N ratio estimates could be time averaged before being used in the weighting and bit decoding.
摘要翻译：用于通过诸如电力线之类的具有大量谐波失真的导线传送数字信息的系统使用发送器（10），该发送器为要发送的多个信号中的每一个产生（3）载波。该载波具有位于谐波失真的频率波瓣之间的频率波瓣。单个载波信号中的每个波瓣在给定位周期期间以相同的位值被编码（19）。然后该信号与导线上的任何现有信号混合（18）。在耦合到导线的远程接收器处，信号被感测，滤波并傅立叶变换为系数。每个傅立叶系数的信噪比（S / N）由新型S / N估算技术确定。基于S / N比估计对系数进行加权，并且优选地通过加权傅里叶系数的内积进行解码。另外，在用于加权和位解码之前，S / N比估计可以是时间平均的。

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