Power carrier communication system adopting OFDM

A power carrier communication and power line technology, which is applied in the modulation carrier system, distribution line transmission system, transmission system, etc., can solve the problems of increased cost of analog filters, narrow transition band frequency, etc.

Inactive Publication Date: 2018-09-28
北京宇电科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Power carrier communication system adopting OFDM

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Embodiment Construction

[0023] 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 power carrier communication system adopting OFDM. The system comprises a transmitting device, a receiving device, a power line, a processor, a transmitting end test module, atransmitting end adapting module, a receiving end testing module, a receiving end adapting module, a converter and a switcher. The transmitting device is used for transmitting communication signals.The receiving device is used for receiving the communication signals. The power line is used for establishing a communication channel between the transmitting device and the receiving device. The processor is used for performing signal comparison and sending control instructions. The processor performs discrete Fourier transform on digital signals output by the converter to obtain frequency domainsignals of the digital signals, and the processing length of the Fourier transform carried out by the processor is greater than the processing length of predefined Fourier transform processing in theOFDM communication standard. The invention has the advantage of providing the power carrier communication system adopting OFDM which can effectively eliminate stack interference and improve the signal transmission quality.

Description

technical field [0001] The present invention relates to a power line carrier communication system, in particular to 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 the attenuation is related...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04B3/54
CPCH04B3/54H04L27/2691
Inventor 孙彭
Owner 北京宇电科技集团有限公司
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