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Device for power line carrier communications

A technology of power line carrier and power line communication, which is applied in the direction of multiplexing communication, distribution line transmission system, electrical components, etc., and can solve the problems of increasing circuit size and increasing power consumption

Inactive Publication Date: 2009-12-23
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a band blocking filter may result in an increase in circuit size
Also, since the band-blocking filter must operate at high speed, this high-speed operation requirement may cause one of the main factors of increased power consumption

Method used

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  • Device for power line carrier communications
  • Device for power line carrier communications
  • Device for power line carrier communications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0048] see now Figure 1A-Figure 24 , an embodiment mode of the present invention will be described.

[0049] (Example Mode 1)

[0050] First, we will now refer to Figure 1A , 1B , 2A and 2B to illustrate the difference between the modulation / demodulation operations performed by Fourier transform and wavelet transform. Figure 1A A diagram illustrating the concept of a time waveform of a wavelet is shown, Figure 1B Indicates a diagram for explaining the concept about the frequency spectrum of a wavelet. Figure 2A is an explanatory diagram for explaining the flow of data in an orthogonal transform operation, Figure 2B is an explanatory diagram for explaining the flow of data in the overlapped orthogonal transform operation.

[0051] In a modulation / demodulation operation using Fourier transform, a plurality of trigonometric functions orthogonal to each other are multiplied by a window function of a rectangular wave to constitute each subcarrier. At this time, the fre...

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PUM

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Abstract

The present invention provides a power line carrier communication device, including: a sending unit, which has a signal point mapping device for mapping a plurality of bit streams generated from sending data, and a wavelet inverse transform device for passing through mutually orthogonal wave waveform to modulate the corresponding subcarrier, so as to generate time waveform series data, a D / A converter for converting the time waveform series data into an analog time waveform series signal; the receiving unit has an A / D converter, Used to obtain the sampled series waveform data from the power line communication signal, the wavelet transform device is used to transform the sampled series waveform data wavelet into corresponding subcarrier signal point data, and the symbol judging device is used for reverse mapping multiple signal point data to judge the bit stream mapped by the signal point mapping device, and to combine the judged bit streams with each other as a received data series.

Description

technical field [0001] The present invention relates to a power line carrier communication device for performing data transmission using a power line. Background technique [0002] A power line carrier communication device possesses a main feature that makes it possible to immediately establish a home communication network by utilizing a power line already installed in each home as a network transmission path. However, since these power line carrier communication devices transmit / receive signals by using such power lines having a degraded degree of balance as communication media, high electric power leaks from these power lines. Also, among frequency bands required for high-speed power line carrier communication, amateur radio communication and short-wave broadcasting programs are already utilizing these frequency bands. As a result, there is a problem of interference caused by these power line carrier communication devices to these existing communication systems. With res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B3/54H04J11/00
Inventor 児玉宣贵古贺久雄权藤孝雄
Owner PANASONIC CORP