OFDM-based data transmission device

A data transmission device and a technology for digital signal processing, applied in the field of data transmission, can solve the problems that power line carrier communication cannot meet the real-time, rapidity and reliability of information transmission, and achieve improved reliability and security, improved safety and reliability. The effect of reliability

Inactive Publication Date: 2015-03-25
XUCHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It should be noted that power line carrier communication is far from meeting the real-time, rapidity and reliability of modern power system operation control, protection information transmission, and the requirements for other large amounts of information transmission.

Method used

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  • OFDM-based data transmission device
  • OFDM-based data transmission device
  • OFDM-based data transmission device

Examples

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Embodiment Construction

[0024] In order to make the objects and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0025] A data transmission device based on OFDM, comprising

[0026] Digital signal processing module adopts ADSP2187 (40MHz) chip; this chip generally has the following main features:

[0027] 40MHz main frequency, 80MIPS (execute millions of instructions per second, 25ns instruction cycle); on-chip 256KB memory, can be configured into 48K×24bit program area (PM) and 56K×16bit data area (DM), PM can store data at the same time ; Independent ALU, multiplier / accumulator, barrel shifter; two independent address generators; two double-buffered serial ports; one 16bitDMA; six external interrupts; 13 programmable flag pins (PF0-PF7 , flag_in, flag_...

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Abstract

The invention discloses an OFDM-based data transmission device. A high-speed DSP and a corresponding software program are adopted for detecting and judging the operation situation of two mainframes and two channels, corresponding non-contact soft handover is carried out when a certain mainframe or channel breaks down, normal communication is not affected when any mainframe or channel breaks down, and meanwhile as a hardware switching circuit is omitted, safety and reliability of data transmission are greatly improved. Aiming at solving the problems that a power line carrier channel is large in noise and severe in interference, improving the impulse interference and narrow-band interference resistance capacity of data signal transmission to the maximum extent and effectively improving the utilization rate of a frequency band at the same time, the OFDM and the method realized by the DSP software are adopted, and the goal that signal transmission rate in bandwidth of 4 kHz on a power line reaches 9600 b/s is achieved.

Description

technical field [0001] The invention relates to the field of data transmission, in particular to an OFDM-based data transmission device. Background technique [0002] Power line carrier communication is a unique communication method for power systems. It uses power lines as the transmission medium and has unique advantages such as high channel reliability, strong anti-destructive ability, low investment, and quick results. In our country, after decades of development and application, it has reached a considerable scale and level, and has become one of the main communication means of the power system communication network. It plays an important role in power production and management, economic dispatch and safe and stable operation of the power grid. [0003] The frequency band resource available for power line carrier communication is 40kHz-500kHz (extensible to 1000kHz), while the existing high-voltage power line carrier communication (PLC) is based on narrow-band transmis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B3/54
CPCH04B3/54H04L27/2601
Inventor 程菊明张向群孟雷王闯孟耀伟王奎甫张江维孙刚
Owner XUCHANG UNIV
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