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 Title: |
US5952914:
Power line communication systems
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Wynn, Woodson Dale; Basking Ridge, NJ
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| Assignee: |
AT&T Corp., Middletown, NJ
other patents from AT&T CORP. (706518) (approx. 16,328)
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| Published / Filed: |
1999-09-14
/ 1997-09-10
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| Application Number: |
US1997000926609
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| IPC Code: |
Advanced:
H04B 3/23;
H04B 3/34;
Core:
H04B 3/02;
more...
IPC-7:
H04M 11/04;
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| U.S. Class: |
Current:
370/290;
340/310.17;
340/538.12;
370/284;
Original:
340/310.01;
340/310.03;
340/310.06;
340/310.07;
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| Field of Search: |
340/310.01,310.02,310.03,310.05,310.06,310.07,310.2
375/259
455/3.3
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| Priority Number: |
| 1997-09-10 |
US1997000926609 |
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| Abstract: |
Two duplex channels are provided using only three lines, two power lines and one neutral line. The transmitter/receiver of each duplex channel includes adaptive filters to cancel cross-coupling introduced by the common neutral line. Each channel is coupled to a power line using a hybrid line driver/receiver device. The hybrid line driver/receiver device includes an echo canceller and a bridge circuit to allow transmitting and receiving signals to and from a single power line with minimized echoing effects. The signal-to-noise ratios of each duplex channel is significantly increased so that two duplex channels may be implemented using only three wire connections. Thus, the communication capacity of power line communication systems is greatly increased compared to that for a single 2-wire channel.
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| Primary / Asst. Examiners: |
Hofsass, Jeffery; Pham, Toan N.
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Designated Country: |
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
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| Family: |
Show 3 known family members
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First Claim:
Show all 26 claims |
What is claimed is:
1. A power line communications system, comprising:
- a first power line and a second power line;
- a neutral line;
- a transmitter/receiver coupled to the neutral line and the first and the second power lines, the transmitter/receiver transmitting and receiving information using the first power line and the neutral line as a first channel and the second power line and the neutral line as a second channel, wherein the first channel is independent of the second channel.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 58 U.S. patent(s) that reference this one
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| Foreign References: |
None
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| Other Abstract Info: |
DERABS G1999-182702
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| Other References: |
"Power-Line Carrier Systems", Authors:T.M. Swingle & H.I. Dobson, Chapter 14, pp. 14-19.
"A Model For Communication Signal Propagation On Three Phase Power Distribution Lines", Authors: M.E. Hardy, S. Ardlan, J.B. O'Neal, Jr., L.J. Gale & K.C. Shuey, IEEE Transactions on Power Delivery, vol. 6, No. 3, Jul. 1991, pp. 966-972.
(7 pages)
Cited by 3 patents
[ISI abstract]
"Decoupling Networks For Promoting Power Line Carrier Systems"; Author: K.S. Murthy; IEEE Transactions on Power Delivery, vol. 10, No. 2, Apr. 1995, pp. 580-587.
(8 pages)
Cited by 3 patents
[ISI abstract]
"Power-Line Noise Survey", Author: A. A. Smith, Jr., IEEE Transactions On Electromagnetic Compatibility, vol. T-EMC, Feb. 1972, pp. 31-32.
"Transmission Lines and Waveguides"; Author: R.V. Lowman, of book; Chapter 42, pp. 42-1-42-6.
"Coupled Transmission Line Networks in a Inhomogeneous Dielectric Medium"; Authors: G.I. Zysman & A.K. Johnson, IEEE Transactions on Microwave Theory and Techniques, vol. MTT-17, No. 10, Oct. 1969, pp. 753-759.
"IEEE Guide for Power-Line Carrier Applications", Institute of Electrical and Electronics Engineers, NY, NY, Committee of IEEE Power Eng. Society; Sponsor: Power System Communications, IEEE Standard 643-1980, Jan. 30, 1981, ANSI, pp. 2-63.
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