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Self-learning method for cross-frequency-band power line communication frequency

A technology of power line communication and self-learning method, which is applied in the field of self-learning of cross-band power line communication frequency, and achieves the effects of efficient frequency search processing, small processing capacity and improved speed.

Active Publication Date: 2014-02-26
STATE GRID CORP OF CHINA +3
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  • Abstract
  • Description
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Problems solved by technology

All of the above PLC systems use preambles for synchronization at a known operating frequency, none of the PLC systems use preambles for evaluation and preselection of multiple operating frequencies

Method used

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  • Self-learning method for cross-frequency-band power line communication frequency
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  • Self-learning method for cross-frequency-band power line communication frequency

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Embodiment Construction

[0044] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0045] The invention provides a self-learning method with self-learning and self-selecting working frequency according to channel conditions. Since the working frequency (center frequency point and bandwidth) of the PLC system can be selected in a wide spectrum range, the PLC system has It is possible to adjust the operating frequency under different network environments and channel conditions to ensure normal operation. Without loss of generality, the frequency range usually used for medium and low voltage access networks is 150kHz to 12MHz, which covers the low frequency band of 150-500kHz, the intermediate frequency band of 500kHz-1.6MHz and the high frequency band of 1.6MHz-12MHz (ie across frequency bands).

[0046] For the PLC access network in the preferred frequency range (such as 150kHz-12MHz), the present inve...

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Abstract

The invention relates to a method for cross-frequency-band power line communication, in particular to a self-learning method for a cross-frequency-band power line communication frequency. The frequency range where the method is applied is 150kHz-12MHz. The method comprises the following steps that (1) a default working frequency set is determined; (2) a leader sequence is adopted to conduct pre-selection on the default working frequency set, default working frequencies where the leader sequence cannot be correctly detected are screened out, and the default working frequencies where the leader sequence is correctly detected are used as potential working efficiency; (3) on the potential working efficiency, control packages are transmitted between a master station and a slave station, and the best working frequency is determined. According to the method, the best frequency (a center frequency point and bandwidth) can be independently learned within the wide spectral range, so that the frequency and data rate are adapted independently according to actual channel conditions. Therefore, effectiveness is improved, the coverage area is expanded, and human intervention is reduced.

Description

technical field [0001] The invention relates to a method for cross-band power line communication, in particular to a self-learning method for frequency of cross-band power line communication. Background technique [0002] Power line communication (PLC) channels are complex and changeable. Different from wireless communication systems, on power line channels, the main power line channel characteristics such as attenuation and interference are closely related to frequency. Specifically, attenuation is closely related to power grid topology, cable material, and link distance. This frequency-dependent channel characteristic often does not change rapidly over time, it only changes with changes in network topology, such as the attenuation of buried power lines increases with frequency and distance, which also limits broadband PLC (BPL) transmittable distance. Narrowband PLC (NPLC) usually has lower attenuation and can transmit longer distances, however narrowband PLC is severely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B3/54H04L27/26
CPCH04B3/544
Inventor 刘伟麟歌德.布米勒杨冰陆阳高鸿坚李建岐陶锋赵涛
Owner STATE GRID CORP OF CHINA
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