Multipath delay measurement method for power line carrier channel

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 multipath time delay of a power line carrier channel. Background technique [0002] Power line carrier communication refers to the communication method that uses power lines as channels, and is mostly used in household power line Internet access, smart home, power consumption information collection, remote control of street lamps and other fields. The biggest advantage of power line carrier communication is to use the existing power line for communication, without re-laying communication lines. [0003] However, since the power line is not specially designed for communication, the characteristics of the power line carrier channel are more complicated, and one of the important problems is multi-path transmission. The multipath transmission of the power line channel is mainly caused by the mismatch of load impedance at the receiving end. ...

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

Images