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Communication method and power line communication terminal

A technology of power line communication and communication mode, which is applied in the direction of multiplex communication, distribution line transmission system, signal transmission/reception through power distribution, etc., which can solve the problems of data communication error, drop, and unavoidable communication speed, etc. Achieve the effect of suppressing the decrease of communication speed

Inactive Publication Date: 2011-02-09
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in a communication system in which communication is stopped at a voltage phase whose bit error rate exceeds a threshold value, although communication errors due to impedance fluctuations can be suppressed, a decrease in communication speed cannot be avoided.
[0011] In a communication system in which pilot symbols are inserted into information symbols, since the pilot symbols themselves do not contribute to actual data communication, the utilization efficiency of the frequency band decreases
Also, if there is a deviation between the impedance fluctuation position and the pilot symbol insertion position within the voltage phase, an error occurs in data communication from the impedance fluctuation position to the next pilot symbol insertion position

Method used

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  • Communication method and power line communication terminal
  • Communication method and power line communication terminal
  • Communication method and power line communication terminal

Examples

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no. 1 Embodiment approach

[0087] figure 1 It is a block diagram showing a schematic configuration of the power line communication system according to the first embodiment. The communication system uses power lines as a communication medium, and communicates between the sending device 101 and the receiving device 201 through multi-carrier transmission. Here, a case where wavelet-based OFDM is used as a multicarrier transmission method will be described as an example.

[0088] exist figure 1 Among them, the transmitting device 101 is composed of the following components: a symbol mapper 110, which performs symbol mapping on the bit string as transmission data; a phase rotator 121, which performs phase rotation on the symbol-mapped data; a serial-to-parallel converter (S / P converter) 130, carry out serial parallel transformation to the data after phase rotation; Inverse wavelet transformer 140, carry out inverse wavelet transformation on this real value on the time axis, produce the sampling value se...

no. 2 Embodiment approach

[0108] In the power line communication system according to the second embodiment, in image 3 The sending device 102 shown and figure 1 Between the receiving devices 201 shown, communication based on a multi-carrier transmission method is performed using power lines as a communication medium. In addition, in image 3 In, with the 1st embodiment's figure 1 The same symbols in the symbols refer to the same constituent elements. In addition, here, a case where wavelet-based OFDM is used as a multicarrier transmission method will be described as an example.

[0109] A unique configuration of the transmitting device 102 according to the present embodiment is the amplitude controller 160 . In the first embodiment figure 1 In the configuration of the transmission apparatus 101 shown, the amplitude control of the transmission signal can also be performed by the symbol mapper 110 , but in this case, the amplitude value of each subcarrier is usually only determined according to ...

no. 3 Embodiment approach

[0119] The difference between the third embodiment and the first and second embodiments is that in order to estimate the impedance of the transmission line between the transmission device 101 (or the transmission device 102, hereinafter only described as the transmission device 101) and the reception device 201 fluctuations without sending transmission line state estimation signals.

[0120] In the present embodiment, the impedance fluctuation amount of the transmission line is estimated by communication of normal data transmitted from the transmitting device 101 to the receiving device 201 . That is, if Figure 8 As shown, when normal data communication is performed, the receiving device 201 estimates the amount of impedance variation during reception of the symbol using the preamble 510 added to the head of the communication signal. The preamble symbol is, for example, a symbol in which all carriers are sine waves, and the receiving device 201 estimates the impedance variat...

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Abstract

In power line communication defining a power line as a transmission line, if a transmission terminal transmits communication signals, the transmission terminal transmits the communication signals while varying the phase parameters of the communication signals to be transmitted in the consecutive communication signals depending on the impedance variations of the transmission line. In the communication method, the phase parameters of the communication signals can be stably received without being varied by the impedance variations of the transmission line, thus making it possible to perform data communication at high speed while suppressing a communication error.

Description

technical field [0001] The present invention relates to a communication method based on a multi-carrier transmission method, in particular to a communication method and a communication device based on a multi-carrier transmission method in power line communication using a power line as a communication medium. Background technique [0002] In a power line communication device using a power line as a communication medium, high-speed data transmission can be performed by adopting a multi-carrier transmission method using OFDM (Orthogonal Frequency Division Multiplexing). In the multi-carrier transmission scheme, FFT (Fast Fourier Transform)-based OFDM or wavelet-based OFDM is often used as conventional techniques. [0003] Figure 7 A schematic structure of a wavelet-based OFDM-based power line communication device is shown. First, in the transmission device 100, the transmission data input from the upper layer is converted into symbol data by the symbol mapper 110, and symbol...

Claims

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Application Information

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IPC IPC(8): H04J11/00H04B3/54
CPCH04L27/2642H04L25/03885H04B2203/5408H04L27/2647H04B3/544H04L25/03343H04L27/2621
Inventor 古山孝好山本祐一田原整儿玉宣贵
Owner PANASONIC CORP
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