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Data transmission method and device based on orthogonal frequency division multiplexing and meter reading system

A data transmission method and a technology of a data transmission device, applied in digital transmission systems, transmission systems, signal transmission systems, etc., can solve problems such as data loss, inability to guarantee data accuracy, integrity, etc., to speed up the speed and improve the success of communication efficiency, reducing interference and bandwidth waste

Inactive Publication Date: 2016-07-20
BEIJING JIERUI ZHONGHENG TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0004] Using the above method can indeed increase the data transmission rate, but if a bit error or packet loss occurs, there is nothing you can do
In general communication, the receiver will perform redundancy check on the received data. If it determines that the identification code is wrong, it will reject the data packet as not received. Therefore, although the existing technology improves the data transmission rate, there will be Loss of data, the accuracy and completeness of the data cannot be guaranteed

Method used

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  • Data transmission method and device based on orthogonal frequency division multiplexing and meter reading system
  • Data transmission method and device based on orthogonal frequency division multiplexing and meter reading system
  • Data transmission method and device based on orthogonal frequency division multiplexing and meter reading system

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Embodiment Construction

[0045] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0046] Such as figure 1 As shown, with the transmitter as the execution subject, it shows a schematic flow chart of an embodiment of the data transmission method based on OFDM in the present invention, refer to figure 1 , the method includes:

[0047] S101: The transmitter disassembles the data into several sub-packets, encodes the sub-packets, and adds a different sequence number to each sub-packet;

[0048] Specifically, the present invention can calculate the frequency division number N that allows splitting according to the Nyquist criterion (Nyquistabilitycriterion) and Shannon's theorem (Shannon'stheorem) according to the bandwidth required by the applied system (generally 2 n ); and the data is split into a plurality of small sub-packets (N / 2 or N / 3 can be taken), each sub-packet is encoded, and a sequence number is added to each sub-packet. Su...

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Abstract

The invention relates to a data transmission method and device based on orthogonal frequency division multiplexing and a meter reading system. The method comprises the steps of dismantling the data into multiple sub-data packets by a transmitter, encoding the sub-data packets, adding different sequence numbers in each sub-data packet; copying multiple copies of the sub-data packets; and modulating all copied sub-data packets into subcarrier signals which are separated at preset frequency intervals, and sending the subcarrier signals to a receiver. By adopting the data transmission method and device based on orthogonal frequency division multiplexing and the meter reading system provided by the invention, an effective bandwidth is effectively used to decompose the communication data into multiple sub-data packets for transmission, so the data transmission rate is accelerated, and the data interference and the bandwidth waste are reduced; and furthermore, redundant data transmission is carried out for multiple times to improve the communication success rate of the data transmission and ensure the accuracy and security of the data.

Description

technical field [0001] The invention relates to the technical field of digital communication, in particular to a data transmission method and device based on orthogonal frequency division multiplexing, and a meter reading system. Background technique [0002] With the advancement of science and technology, digital communication plays an increasingly important role in national life. The transmission of digital signal data is involved in power line carrier communication, wireless communication, line transmission (485 line, optical fiber, twisted pair), etc. Whether it is a dedicated network (frequency point) or a public network (frequency point), the traffic is increasing. In order to ensure communication efficiency, almost all data communications will use "listening", "redundancy check (CRC) )” and other technologies, and some fields will also use technologies such as continuous voice-controlled squelch system (CTCSS), frequency division, and frequency hopping. [0003] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L12/815H04L27/26G08C19/00H04L47/22
CPCH04L1/004H04L1/0061H04L27/2601H04L47/23G08C19/00
Inventor 朴京花杨翠霞唐亮周敬东
Owner BEIJING JIERUI ZHONGHENG TECH CO LTD
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