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System and method for power line communications

A power line and power signal technology, applied in power line communication systems, distribution line transmission systems, systems using filtering and bypassing, etc., can solve problems such as time or frequency is not constant, and the system is not effectively processed.

Inactive Publication Date: 2008-05-07
ANALOG DEVICES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, what has been observed from multiple data samples from the field is that the noise on a typical power line with multiple interfering devices connected to it is not constant in time or frequency, but exhibits periods of calm in both dimensions part
The current system does not handle these situations effectively

Method used

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  • System and method for power line communications
  • System and method for power line communications
  • System and method for power line communications

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Embodiment Construction

[0055] The following description and the embodiments described herein are provided by way of example or illustration of specific embodiments of the principles of the invention. These examples are provided to illustrate, not to limit, the principles of the invention. In the following description, like parts are marked with the same corresponding reference numerals throughout the specification and drawings.

[0056] Briefly stated, signaling systems and methods related to embodiments of the present invention use the time and frequency diversity of transmitted signals to improve the robustness of the system. This improvement in robustness is significant when there is substantial non-stationary power line noise. Thus, this embodiment achieves a significant performance improvement in very harsh conditions.

[0057] In an aspect of an embodiment, the transmission system divides the time axis into a plurality of synchronized time slots. Such that a time slot starts at a zero cross...

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Abstract

A communication system for a power line is described. A transmission system of the communication system divides the time axis into a number of time slots synchronized such that one time slot can start about a zero crossing of the power line signal. These time slots are referred to as channels and are numbered from 1 to n. A modulation method is described to is narrow band continuous phase FSK, where a number m of modulating frequencies are used, arranged such that an integral number of full cycles fit into each channel time slot for all m frequencies. The system transmits during only a subset of the available time slots (channels) concentrated near the zero crossing of the power line waveform where the noise is typically minimal.

Description

technical field [0001] The present invention relates to a system and method for communication over a power line medium, and more particularly to transmission in the presence of a high-amplitude, non-stationary noise source connected to the line. Background technique [0002] Currently, high speed communications over power line media (such as home wiring standards) use a variety of modulation techniques to overcome high noise environments. Two types of systems are commonly used. First, broadband systems can be used which use spread spectrum to combat interference, see for example US Patent Nos.: 5574748, 5090024, 5263046, 6243413, 6616254, 5579335 and 5748671, the contents of which are incorporated herein by reference. [0003] Second, narrowband systems can be used, which use one or more frequencies modulated in frequency or phase. See, eg, US Patent Nos.: 5,504,454 and 4,475,217, the contents of which are incorporated herein by reference. [0004] Note that certain types...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B3/54H04L27/00H04L27/10
CPCH04B2203/5425H04B3/54H04B2203/5491H04B2203/542
Inventor 史蒂夫·巴里尔查尔斯·拉巴尔
Owner ANALOG DEVICES INC
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