Power line channel phase-frequency characteristic detection method and detection device
A technology of power line channel and phase-frequency characteristics, which is applied in the direction of transmission channel monitoring, etc., and can solve the problem that it is difficult to observe phase changes
Active Publication Date: 2021-04-09
国网江西省电力有限公司经济技术研究院 +1
View PDF6 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
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 two-stage filtered preamble sequence in step S2 through two sender mixers to generate two digital carrier signals w...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for detecting phase-frequency characteristics of a power line channel, which includes generating a preamble sequence and performing multi-stage interpolation FIR filtering and multi-stage interpolation CIC filtering; generating a digital carrier signal through two-way mixers, and passing through a power amplifier module at a sending end and a multi-stage interpolation CIC filter; The sender coupler transmits; receives the digital carrier signal and obtains two equivalent complex baseband signals through two mixers; respectively performs CIC filtering, FIR filtering and signal detection on the two equivalent complex baseband signals; obtains two channels, etc. The arrival time difference of the effective complex baseband signal is converted into a phase shift difference; the phase shift difference is measured and recorded, the baseline is selected, and the phase-frequency characteristic curve of the channel response is obtained. The invention also discloses a device for realizing the phase-frequency characteristic detection method of the power line channel. The method and device of the invention can detect the phase-frequency characteristics of the power line channel with low cost, conveniently and quickly.
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(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