Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1996-10-09
1998-12-01
Chin, Stephen
Pulse or digital communications
Receivers
Interference or noise reduction
375259, 34081001, H04B 110, H04L 2508, H03D 104
Patent
active
058449493
ABSTRACT:
A system for communicating digital information over wires having a great deal of harmonic distortion, such as a power line, employs a transmitter which transmitter which creates 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 of a single carrier signal is encoded with the same bit value during a given bit period. This signal is then mixed 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.
REFERENCES:
patent: 5185591 (1993-02-01), Shuey
patent: 5307376 (1994-04-01), Castelain et al.
patent: 5351272 (1994-09-01), Abraham
patent: 5404127 (1995-04-01), Lee et al.
patent: 5519692 (1996-05-01), Hershey et al.
patent: 5519725 (1996-05-01), Hershey et al.
patent: 5581229 (1996-12-01), Hunt
patent: 5666382 (1997-09-01), Thakore
patent: 5717685 (1998-02-01), Abraham
"Multitone Signals With Low Crest Factor" by S. Boyd, IEEE Trans. on Circuits and Systems, vol. CAS-33, No. 10, pp. 1018-1022.
"Substation Noise at Distribution Line Communications Frequencies", J. B. O'Neil, Jr., IEEE Trans. on Electromagnetic Compatibility, vol. 30, No. 1, Feb. 1988.
Gaus, Jr. Richard Charles
Hershey John Erik
Korkosz Richard August
Saulnier Gary Jude
Welles II Kenneth Brakeley
Chin Stephen
General Electric Company
Park Albert
Snyder Marvin
Zale Lawrence P.
LandOfFree
Power line communication system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Power line communication system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power line communication system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2401376