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Power line channel phase frequency characteristic detecting method and device

A technology of power line channel and phase-frequency characteristics, applied in the direction of transmission channel monitoring, etc., can solve the problems such as difficult to observe phase changes, achieve the effect of suppressing out-of-band interference and reducing measurement costs

Active Publication Date: 2019-04-05
国网江西省电力有限公司经济技术研究院 +1
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AI Technical Summary

Problems solved by technology

As for the phase characteristics, in addition to the need for the Global Positioning System (GPS) to synchronize the sending and receiving ends, it is also difficult to observe the phase change in the case of some negative signal-to-noise ratios

Method used

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  • Power line channel phase frequency characteristic detecting method and device
  • Power line channel phase frequency characteristic detecting method and device
  • Power line channel phase frequency characteristic detecting method and device

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Embodiment Construction

[0033] Such as figure 1 Shown is the method flowchart of the method of the present invention: the method for detecting phase-frequency characteristics of this power line channel provided by the present invention includes the following steps:

[0034] S1. The sender generates a preamble; the preamble is a randomly generated bit sequence consisting of 0 and 1 without any data information;

[0035] S2. Carry out multi-stage interpolation FIR filtering at the transmitting end and multi-stage interpolating CIC filtering at the transmitting end on the preamble sequence generated in step S1, thereby increasing the sampling frequency of the equivalent complex baseband signal of the preamble sequence; The form of the signal is filtered by multi-stage interpolation FIR at the sending end and multi-stage interpolation CIC filtering at the sending end;

[0036] S3. Pass the preamble sequence filtered by the two poles in step S2 through two sender mixers to generate two digital carrier si...

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Abstract

The invention discloses a power line channel phase frequency characteristic detecting method. The method comprises the steps of: generating a leader sequence and performing multi-stage interpolation FIR filtering and multi-stage interpolation CIC filtering; generating a digital carrier signal through two frequency mixers, and transmitting the digital carrier signal through a transmitting power amplifier module and a transmitting end coupler; receiving the digital carrier signal and obtaining two paths of equivalent complex baseband signals respectively through the two frequency mixers; performing CIC filtering, FIR filtering and signal detection for the two paths of equivalent complex baseband signals; obtaining the arrival time difference of the two paths of equivalent complex baseband signals and converting the two paths of equivalent complex baseband signals to the phase shift difference; measuring and recording the phase shift difference, selecting a reference line, and obtaining aphase frequency characteristic curve with channel response. The present invention further discloses a device for achieving the power line channel phase frequency characteristic detecting method. Themethod and the device provided by the invention can conveniently and rapidly perform detection of the power line channel phase frequency characteristic in a low cost.

Description

technical field [0001] The invention specifically relates to a detection method and a detection device for the phase-frequency characteristic of a power line channel. Background technique [0002] With the development of economy and technology and the improvement of people's living standards, electric energy has become an indispensable secondary energy source in people's production and life, bringing endless convenience to people's production and life. [0003] The power line channel is an important communication channel in the power system, which undertakes important tasks such as power system communication and data transmission. Therefore, the research on the power line channel is one of the important conditions to ensure the safe and reliable operation of the power system. [0004] Power line channels are characterized by frequency-selective multipath fading, low-pass behavior, AC-related periodic short-term variations, and irregular long-term variations. Inhomogeneities...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/30
CPCH04B17/30
Inventor 李映雪朱文广方旎杨为群彭怀德钟士元万凯熊宁郑富永田晖刘小春章小枫王敏周成王丽王伟孔强汪楚锟黄春明杨超吴泳澎
Owner 国网江西省电力有限公司经济技术研究院
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