A digital front-end system for power line carrier communication and its implementation method

A technology of power line carrier and digital front end, which is applied in the application of power line communication, distribution line transmission system, wired transmission system, etc., can solve problems that have not been raised, reduce interference, reduce out-of-band energy, and suppress out-of-band interference Effect

Active Publication Date: 2017-06-23
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of Nyquist window function has been used in the receiving end processing of wireless communication OFDM system, but it has not been proposed in the power line carrier communication system

Method used

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  • A digital front-end system for power line carrier communication and its implementation method
  • A digital front-end system for power line carrier communication and its implementation method
  • A digital front-end system for power line carrier communication and its implementation method

Examples

Experimental program
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Effect test

Embodiment 1

[0050] The structural example diagram of the transmitter in the digital front-end system provided by the present invention is as follows image 3 As shown, the center frequency can be selected between 0 Hz and 25 MHz, and the bandwidth supports flexible configuration between 7.8 kHz and 10 MHz.

[0051] In this implementation, the digital front-end structure of the transmitter includes an inverse Fourier transform (IFFT) module, a raised cosine window windowing module, an interpolation low-pass filter with a rate conversion factor of 2, a rate conversion factor of 3 An interpolation low-pass filter, an interpolation low-pass filter with a rate conversion factor of 5, and a frequency point of f c mixer and a digital-to-analog converter (DAC). Using the 4096-point inverse Fourier transform module, the modulation symbols are respectively mapped to subcarriers 1 to 410 and subcarriers 3687 to 4096, and converted to an equivalent complex baseband signal in the time domain through ...

Embodiment 2

[0054] The structural example diagram of the receiver in the digital front-end system provided by the present invention is as Figure 5 As shown, in this implementation, the digital front-end structure of the receiver includes a Fourier transform (FFT) module, a raised cosine window windowing module, a decimation low-pass filter with a rate conversion factor of 2, a rate conversion factor A decimation low-pass filter of 3, a decimation low-pass filter with a rate conversion factor of 5, and a frequency point of f c mixer and an analog-to-digital converter (ADC). Such as Figure 5 As shown, the receiver performs the inverse operation corresponding to the transmitter. First, the input signal (analog signal) at the receiving end is converted into a digital bandpass signal by an analog-to-digital converter, and then downshifted by a mixer to become an equivalent complex baseband signal. Then, the equivalent complex baseband signal is converted to R by a first-order rate convers...

Embodiment 3

[0057] Transmitter and receiver raised cosine window schematic diagrams provided by the present invention are as Figure 6 as shown, Figure 6 A working mode of the raised cosine window in the transmitter and receiver is given, wherein the upper window is the raised cosine window at the transmitting end, and the lower window is the raised cosine window at the receiving end. The transmitter generates a Figure 6 Complete Orthogonal Frequency Division Multiplexing (OFDM) with cyclic prefix and cyclic suffix shown, symbol. The raised cosine window of the receiver can utilize N 5 cyclic prefix of sampling points, N 5 cyclic suffix of sampling points and 2N in OFDM symbols 5 sampling points to improve demodulation performance, N 5 cyclic prefix of points and N 5 The cyclic suffix of the dot must be guaranteed not to be affected by inter-symbol interference. In addition, N 1 The cyclic prefix and cyclic suffix of sampling points are used for the raised cosine window at the t...

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Abstract

The present invention relates to the field of power communication supporting smart grids, in particular to a digital front-end system for power line carrier communication and its implementation method; the digital front-end system includes a transmitter and a receiver that communicate sequentially; the transmitter includes sequentially Communication inverse Fourier transform module, windowing module I, interpolation filter, mixer I and digital-to-analog converter; the receiver includes sequentially communicating analog-to-digital converter, mixer II, decimation filter, adding Window Module II and Fourier Transform Module. The implementation method includes the following steps: (1) inputting modulation symbols to a transmitter and converting them into analog signals; (2) converting the input analog signals to a receiver into modulation symbols. The invention combines the digital front end in the form of an equivalent complex baseband with the Nyquist window method, and has the characteristics of supporting frequency band selection, supporting bandwidth configuration, suppressing out-of-band interference, reducing out-of-band energy of transmitted signals and suppressing in-band narrowband interference.

Description

technical field [0001] The invention relates to the field of power communication supporting smart grids, in particular to a digital front-end system supporting equivalent complex baseband OFDM modulation for power line carrier communication and an implementation method thereof. Background technique [0002] Compared with other communication systems, the power line carrier communication channel is more complex and changeable. The power line carrier communication channel has frequency selectivity, time variation, colored background noise, narrow-band interference and various impulse noises. These characteristics are mainly caused by various electrical appliances connected to the power line. For example, the European CE (Conformiteeuropeenne) certification only measures the electromagnetic compatibility (EMC) characteristics of test appliances above 150 kHz, so the noise below 150 kHz is very high. At the same time, the attenuation that varies with transmission distance, grid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04B3/54
CPCH04B3/542H04B2203/5433
Inventor 高鸿坚布米勒·歌德刘伟麟杨冰李建岐
Owner STATE GRID CORP OF CHINA
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