Communication method based on power line carrier communication system adopting OFDM

A technology of power carrier communication and communication method, which is applied in baseband systems, baseband system components, distribution line transmission systems, etc., and can solve problems such as narrow transition band frequency and increased cost of analog filters

Active Publication Date: 2018-08-17
北京宇电科技集团有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0009] When using OFDM technology, the analog filter is used as the anti-aliasing filter in the prior art, but the cost of the analog filter is greatly increased due to the narrow transition band frequency required by the existing standard

Method used

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  • Communication method based on power line carrier communication system adopting OFDM

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Embodiment Construction

[0035] Such as figure 1 As shown, a power carrier communication system using OFDM includes: a transmitter 1, a receiver 2, a power line 3, a processor 4, a transmitter test module 5, a transmitter adapter module 6, a receiver test module 7, and a receiver An adaptation module 8, a converter 9, and a switch 10; the transmitting device 1 is used to transmit communication signals; the receiving device 2 is used to receive communication signals; the power line 3 is used to establish a communication channel between the transmitting device 1 and the receiving device 2; processing The device 4 is used to perform signal comparison and issue control instructions; the converter 9 is used to convert the analog signal into a digital signal; the switcher 10 is connected to the transmitter adaptation module 6 and the receiver adaptation module 8 respectively, and the switcher 10 and The converter 9 and the processor 4 also form a connection, and the processor 4 can control the switch 10 so ...

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Abstract

The invention discloses a communication method based on a power line carrier communication system adopting OFDM. The communication method comprises the steps that a transmitting device transmits a communication signal; a receiving device receives the communication signal; a power line is used for establishing a communication channel between the transmitting device and the receiving device; a converter samples an analog signal, wherein the sampling frequency during sampling is higher than the sampling frequency predefined in an OFDM communication standard; and a processor conducts discrete Fourier transform on a digital signal output by the converter, wherein the processing length during discrete Fourier transform is longer than the Fourier transform processing length predefined in the OFDMcommunication standard. The power line carrier communication method which can effectively eliminate wave superposition interference and improve the signal transmission quality and adopts OFDM is provided.

Description

technical field [0001] The invention relates to a power line carrier communication method, in particular to a communication method based on a power carrier communication system using OFDM. Background technique [0002] The existing power line carrier communication technology refers to a network that uses power lines as a communication medium to transmit data modulated by a carrier wave over long distances. The application of power line carrier is mainly in meter reading of residential energy meters, street lamp control, and smart home. [0003] Existing carrier communication systems often use more equipment for conversion and sending and receiving processing, but there are often situations where the correction of the signal is not enough to eliminate the noise in the signal. [0004] Specifically, the disadvantage of the power line carrier channel is that the interference is strong, and the interference is highly time-varying. Channel selective attenuation is large, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B3/54H04L25/03
CPCH04B3/54H04L25/03006H04L2025/03414
Inventor 孙彭
Owner 北京宇电科技集团有限公司
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