发明名称 |
Power line communication system |
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. <IMAGE>
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申请公布号 |
EP0915574(A1) |
申请公布日期 |
1999.05.12 |
申请号 |
EP19970308761 |
申请日期 |
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 |
分类号 |
H04B3/54;H04L1/04;H04L5/06;(IPC1-7):H04B3/54;H04L27/26 |
主分类号 |
H04B3/54 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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