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    • 53. 发明公开
    • Error correction device and error correction method
    • Fehlerkorrekturvorrichtung und -verfahren
    • EP1306997A1
    • 2003-05-02
    • EP02007285.6
    • 2002-04-02
    • FUJITSU LIMITED
    • Kaku, Takashi, Fujitsu LimitedOkita, Ryoji, Fujitsu Limited
    • H04L1/20H04L27/26H04L1/04G06F11/10H03M13/00
    • H03M13/00H04L1/0041H04L1/0045H04L1/0057H04L1/0063H04L1/20H04L2001/0096
    • At least one of a plurality of channels is used as an error correction channel. An identification unit calculates the exclusive OR or modulo sum of data items sent on the remaining channels and adopts the calculated exclusive OR or modulo sum as data sent on the error correction channel. An exclusive OR unit calculates the exclusive OR or modulo sum of the identified data items sent on the plurality of channels. A signal quality detection unit detects the signal qualities concerning the plurality of channels. If an output of the exclusive OR unit is a predetermined specific value such as 0, an identifying and processing unit provides the identified data items. If the output of the exclusive OR unit is not the predetermined specific value such as 0, the identifying and processing unit replaces the identified data, which is sent on the channel whose signal quality is detected to be the worst by the signal quality detection unit, with the exclusive OR or modulo sum of the identified data items sent on the channels other than the channel whose signal quality is the worst. The identifying and processing unit then provides the resultant data.
    • 多个通道中的至少一个被用作纠错通道。 识别单元计算在剩余信道上发送的数据项的异或或模数和,并将所计算的异或或模和作为在纠错信道上发送的数据。 异或单元计算在多个信道上发送的识别的数据项的异或或模和。 信号质量检测单元检测关于多个信道的信号质量。 如果异或单元的输出是诸如0的预定特定值,则识别和处理单元提供所识别的数据项。 如果异或单元的输出不是诸如0的预定特定值,则识别和处理单元将信号质量被检测到的信道上发送的识别数据替换为信号质量检测单元是最差的, 在信道质量最差的信道以外的信道上发送的识别数据项的异或或模数和。 识别和处理单元然后提供所得到的数据。
    • 55. 发明公开
    • Power line communication system
    • 电力线通信系统
    • EP0915574A1
    • 1999-05-12
    • EP97308761.2
    • 1997-10-31
    • GENERAL ELECTRIC COMPANY
    • Hershey, John ErikKorkosz, Richard AugustSaulnier, Gary JudeGaus, Richard Charles, Jr.Welles, Kenneth Brakeley, II
    • H04B3/54H04L1/04H04L27/26
    • H04L1/04H04B3/54H04B2203/5416H04B2203/5495H04L5/06
    • 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.
    • 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。