Zero frequency conversion and adaptive frequency selecting power line carrier data transmission method

A data transmission method and power line carrier technology, applied in the distribution line transmission system and other directions, can solve the problems of complex frequency conversion modulation and insufficient bandwidth utilization, and achieve the effect of reducing complexity

Active Publication Date: 2009-03-25
STATE GRID ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is used to solve the problem that the traditional OFDM system needs to perform complex frequency conversion modulation after IFFT transformation to realize spectrum shift and insufficient bandwidth utilization

Method used

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  • Zero frequency conversion and adaptive frequency selecting power line carrier data transmission method
  • Zero frequency conversion and adaptive frequency selecting power line carrier data transmission method
  • Zero frequency conversion and adaptive frequency selecting power line carrier data transmission method

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Embodiment Construction

[0049] TMS320VC5509 is a high-end 16-bit fixed-point DSP series device launched by TI for communication applications. The device has a high cost performance, powerful, flexible, and compatible with the C54 series instruction set. The speed can reach: 288MIPS / 400MIPS. Two high-speed digital signal processors (DSP) TMS320VC5509 of TI Company can complete the baseband processing algorithm and frame structure processing of sending and receiving respectively, and the program control of the whole baseband processing system can be realized by ARM7 or ARM9 microcontroller.

[0050] The sending unit is realized by a piece of TMS320VC5509. The data to be sent is input by the microcontroller to the entrance of the baseband transmission processing module. The baseband transmission processing module first groups the data, adds CRC check bits and undergoes pseudo-random sequence modulation (scrambling). The pseudo-random sequence modulation makes the signal "whiten", which can effectively...

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Abstract

The invention discloses a data transmission method of a carrier wave of a power line, with frequency conversion and adaptive frequency selection. Communication band can be flexibly divided into a plurality of subcarriers through the arrangement of IFFT points and a sampling rate. When the carrier wave is distributed before the conversion of the IFFT, modulation data is just distributed on the subcarriers of 40 kHz to 500 kHz, and data on the other subcarriers is zero, thereby ensuring that the actual applied frequency range is 40 kHz to 500 kHz, without the need of the frequency spectrum displacement. A local end can figure out the channel condition of each subcarrier through the method of receiving a known signal sent by an opposite end, chooses the subcarrier which has the good channel condition to send a signal, and abandons the subscriber which has the channel condition. The invention can directly modulate the signal on the needed transmission band and carrier frequency, thereby reducing realization complexity and choosing the transmission band of the signal in an adaptive manner.

Description

technical field [0001] The invention belongs to the technical field of power system communication, and relates to a power line carrier data transmission method, in particular to a power line carrier data transmission method with zero frequency conversion and adaptive frequency selection. Background technique [0002] Power lines have a long history of being used for communication while transmitting electrical energy. As early as the 1920s, people successfully used power lines to transmit information for dispatching telephones, telecontrol, high-frequency protection and other monitoring systems. Power Line Carrier (PLC) communication in the 40kHz-500kHz frequency band is an important power system communication method. [0003] The available frequency band resource for power line carrier communication is 40kHz-500kHz. Traditional power line carrier data transmission methods are all narrowband, and the communication bandwidth is less than 4kHz, which is only suitable for low-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B3/54
Inventor 郭经红张浩
Owner STATE GRID ELECTRIC POWER RES INST
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