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Multipath Delay Measurement Method for Power Line Carrier Channel

A power line carrier, multi-path delay technology, applied in distribution line transmission system, line transmission monitoring/testing, line transmission components and other directions, can solve the problems of inability to receive GPS signals, high implementation complexity, and high price. Achieving the effect of wide application range, low hardware device volume and low cost

Active Publication Date: 2018-08-28
WILLFAR INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this type of measurement method are: 1. Instruments such as signal generators and oscilloscopes for testing are expensive and bulky, suitable for laboratory measurement, but not suitable for field use
2. It is necessary to use the GPS standard clock for calibration, and in the field environment, the power line carrier communication node is generally located indoors or in the basement power distribution room, and cannot receive GPS signals
3. One or more Fourier transforms / inverse transforms are required, or multiple iterations are required, the amount of calculation is large, and the implementation complexity is high

Method used

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  • Multipath Delay Measurement Method for Power Line Carrier Channel
  • Multipath Delay Measurement Method for Power Line Carrier Channel
  • Multipath Delay Measurement Method for Power Line Carrier Channel

Examples

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Embodiment Construction

[0030] Such as figure 1 Shown is a schematic flow diagram of the method of the present invention: the multipath delay measurement method of the power line carrier channel provided by the present invention includes the following steps:

[0031] S1. The sender constructs a pseudo-random sequence group with auto-correlation and cross-correlation characteristics. The pseudo-random sequence group includes a short pseudo-random sequence, an interval time sequence, and a long pseudo-random sequence that are connected in sequence. The short pseudo-random sequence is used for Data synchronization, the duration of the interval time sequence is required to be greater than the maximum multipath delay of the power line channel under test; the long pseudo-random sequence is used to measure the multipath delay measurement of the channel; at the same time the pseudo-random sequence group constructed by the sender is copied to the receiver end;

[0032] The pseudo-random sequence can use existing p...

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Abstract

The invention discloses a multipath delay measurement method for a power line carrier channel. The multipath delay measurement method comprises the following steps: creating a pseudo-random sequence group and copying the pseudo-random sequence group to a receiving end by a sending end; coupling the pseudo-random sequence group in a power line channel is to be measured; receiving a short pseudo-random sequence and calculating a relevant sequence; completing data synchronization; receiving a long pseudo-random sequence and calculating the relevant sequence; determining a main path correlation peak and multipath correlation peak; and calculating an arrival time difference of a main path and each path to obtain a channel multipath delay measurement value of the power line carrier channel. According to the multipath delay measurement method disclosed by the invention, no standard clock source is needed, so no dependence is relied on a GPS clock signal or other clock signals, the application range is wide, the data analysis and processing method of the pseudo-random sequences in the multipath delay measurement method disclosed by the invention is intuitive to operate, simple and quick, thereby being suitable for application occasions of various types, and the requirements on hardware performance are low, so a hardware device carrying the method disclosed by the invention is small in volume, low in cost and is suitable for measurement sites and test occasions of various types.

Description

Technical field [0001] The invention belongs to the field of power line communication, and in particular relates to a method for measuring the multipath time delay of a power line carrier channel. Background technique [0002] Power line carrier communication refers to a communication method that uses power lines as a channel, and is mostly used in home power line Internet access, smart home, electricity information collection, and street lamp remote control. The biggest advantage of power line carrier communication is the use of existing power lines for communication without the need to re-lay communication lines. [0003] However, because the power line is not specifically designed for communication, the characteristics of the power line carrier channel are more complicated, and one of the important issues is multipath transmission. The multipath transmission of the power line channel is mainly caused by the load impedance mismatch of the receiving end and other reasons. Multip...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B3/46H04B3/54
CPCH04B3/46H04B3/54
Inventor 胡泽鑫范律肖林松徐鹏程
Owner WILLFAR INFORMATION TECH CO LTD
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