Method and device for acquiring channel transmission characteristics

Abstract

An embodiment of the present invention provides a method and device for acquiring channel transmission characteristics, wherein the method includes: acquiring the transmission characteristic curves of at least two channels in the cable modem through channel scanning; the at least two channels form a continuous frequency band, and the The frequency values ​​of the frequency points corresponding to the transmission characteristic curves of the at least two channels have the same order of magnitude, and the magnitude of the amplitude value is also the same; the transmission characteristic curves of the channels are translated along the amplitude direction, so that the same frequency points of each transmission characteristic curve The corresponding amplitudes overlap to form a continuous curve; the continuous curve is used as the transmission characteristic curve of the continuous frequency band. The method and device for obtaining channel transmission characteristics provided by the invention can realize the acquisition of channel transmission characteristics when the HFC network is in a working state, and improve the accuracy of analysis results.

Description

technical field [0001] The present invention relates to communication technology, in particular to a method and device for acquiring channel transmission characteristics. Background technique [0002] Hybrid Fiber-Coaxial (HFC for short) network technology is an economical and practical integrated digital service broadband network access technology. HFC usually consists of three parts: optical fiber trunk line, coaxial cable branch line and user distribution network. The program signal from the cable TV station is first converted into an optical signal and transmitted on the trunk line; after reaching the user area, the optical signal is converted into an electrical signal, and distributed After distribution, it is sent to the user through the coaxial cable. [0003] figure 1 is a schematic diagram of a typical HFC network, such as figure 1 As shown, the HFC network includes the following equipment and devices: a network management system, a Proactive Network Maintenance ...

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Problems solved by technology

[0006] For how to obtain the transmission characteristics from the CM to the head end, the existing technology usually uses a network analyzer or a spectrum analyzer to measure and analyze the network signal, but this method needs to be carried out when the entire HFC network is offline, and cannot be performed when the HFC is in The operation is carried out in the working state; moreover, this method requires that there are no other intrusion signals in the network, such as noise interference, etc. If there is, the intrusion signal will also be measured by the instrument, so that it cannot correctly reflect the characteristics of the line, resulting in measurement and analysis results Inaccurate

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