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Advanced Metering Infrastructure (AMI) system carrier communication module baseband mapping and demapping method

A carrier communication module and baseband mapping technology, applied in the transmission system, multi-frequency code system, digital transmission system, etc., can solve the problems of reducing the system's anti-noise ability and high algorithm complexity, and achieve the effect of improving performance and implementing simple algorithms

Inactive Publication Date: 2013-08-07
HUNAN UNIV +1
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  • Application Information

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Problems solved by technology

[0008] 1. Whether it is coherent demodulation or differential demodulation, the algorithm complexity is relatively high for the existing algorithm baseband mapping method
[0009] 2. After the baseband mapping method of the existing algorithm is demodulated, Viterbi decoding can only use hard judgment, which reduces the system's ability to resist noise

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  • Advanced Metering Infrastructure (AMI) system carrier communication module baseband mapping and demapping method
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  • Advanced Metering Infrastructure (AMI) system carrier communication module baseband mapping and demapping method

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Embodiment Construction

[0038] The OFDM power carrier physical layer is directly oriented to the physical medium power line that actually undertakes data transmission. It provides a physical connection for the upper MAC layer to transmit the original bit stream on the power line, so the physical layer directly faces various interferences and interferences of the power line. attenuation.

[0039] The present invention will be further described below in conjunction with accompanying drawing.

[0040] The basic structure of the physical layer sending end of the present invention is as figure 1 As shown, the sending end includes a forward error control coding module and an OFDM modulation module. The data to be transmitted is first subjected to crosstalk, convolutional coding, interleaving, and then mapped and sent for IFFT transformation.

[0041] In the forward error control coding module, after the convolutional coding, there is a two-dimensional interleaving coding module. The purpose of interlea...

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Abstract

The invention discloses an advanced metering infrastructure (AMI) system carrier communication module baseband a mapping and demapping method. The method comprises the following steps of mapping a code and demapping the code, wherein when in code mapping, firstly inputting a code stream to a mapping coder through a forward error correction coder; then carrying out the differential coding; carrying out the gray coding; carrying out the mapping coding which is suitable for the soft decision; and finally carrying out the inverse fast fourier transform (IFFT) transformation for the code stream; and when in demapping, transmitting the received code stream to a demapping coder after the FFT transformation; then carrying out the soft-decision demapping; demapping a gray code and carrying out the differential decoding; and finally transmitting the code to a soft-decision viterbi decoder to have the viterbi decoding. By adjusting the distribution of constellation points of a baseband mapping way and changing an output phase, no best decider is needed, and the algorithm is simple to realize; and the hard decision is not needed, the performance of a mapping codec can be improved, the difficulty of the algorithm is alleviated, and the noise resistance can be improved.

Description

technical field [0001] The invention relates to a communication module baseband mapping and demapping method, in particular to a baseband mapping and demapping method for an AMI system carrier communication module. Background technique [0002] The implementation standards of the existing automatic meter reading system carrier communication module include G3 standard OFDM power line carrier communication technology and PRIME standard OFDM power line carrier communication technology. The PRIME standard physical layer baseband mapping method is similar to the G3 standard, so the G3 standard is used here as an example to illustrate the shortcomings of the prior art. The physical layer of the G3 standard is at the sending end: two-stage error correction and detection coding (RS coding + convolutional coding), followed by interleaving, then baseband mapping, and IFFT transformation; at the receiving end, the process is just the opposite: FFT transformation, baseband solution Map...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L27/26
Inventor 谷志茹刘宏立徐琨刘述钢李祥陈艳李智良陈鑫雯
Owner HUNAN UNIV