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Coaxial line signal frequency shift transmission method

A transmission method and technology of coaxial cable, applied in the transmission of frequency shifting, the transmission field of signal frequency shifting in coaxial cable, can solve the problems of easy interference, single channel of EOC system, etc., achieve frequency division multiplexing, realize Convergence and increase the effect of network bandwidth

Inactive Publication Date: 2016-08-10
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to address the deficiencies of the prior art, to provide a transmission method for signal frequency shifting in the coaxial line with wide application range and strong compatibility, which can be used to solve the problem that the channel of the EOC system is single and easily interfered, and can Coaxial network generalized to various signal transmission technologies

Method used

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  • Coaxial line signal frequency shift transmission method
  • Coaxial line signal frequency shift transmission method
  • Coaxial line signal frequency shift transmission method

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Experimental program
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Effect test

Embodiment 1

[0022] see figure 1 , the transmission method for shifting the frequency band of the signal in the coaxial line adopts a tunable frequency conversion communication system for transmission, and is characterized in that: the tunable frequency conversion communication system consists of an EOC local end containing a tunable frequency conversion chip A (2) The device NC (1) is sequentially connected to the coaxial distribution network (3) and the user end device NU (5) containing the tunable frequency conversion chip B (4); the transmission procedure is as follows: the EOC local end device NC (1) sends The Ethernet data signal, through the tunable frequency conversion chip A (2), switches the signal working frequency band to the target frequency band according to needs; through the coaxial distribution network (3), it is transmitted to the user terminal equipment NU (5), and the built-in tunable frequency conversion chip B (4), restore the signal frequency to the original frequenc...

Embodiment 2

[0024] This embodiment is basically the same as Embodiment 1, and the special features are as follows:

[0025] The EOC central office equipment NC (1) is generally located in a corridor or a residential area, and mainly uses frequency division multiplexing (OFDM) technology to mix the frequency-converted Ethernet data signal and broadcast TV signal and send it to the coaxial distribution network (3 ), delivered to the user's room by the coaxial distribution network (3).

[0026] The tunable frequency conversion chip A (2) can be controlled by software to select the optimal transmission frequency channel by automatically monitoring the channel quality, so as to avoid frequency bands with more interference noise and realize high-quality signal transmission.

[0027] The user-end equipment NU (5) is located in the user's home, and is extended from the coaxial distribution network to the coaxial port of each room of the user; the user-end equipment NU (5) sends the broadcast TV s...

Embodiment 3

[0029] see figure 1 , In the original EOC system, the signal of the central office equipment of the EOC works in the 5-65MHz band, but the noise in the frequency band is relatively large, which is not conducive to the normal operation of the EOC system. Using the transmission method of shifting the frequency band of the signal in the coaxial line, the Ethernet data signal sent by the local end equipment NC (1) of the EOC increases the working frequency band of the signal to 505M-565MHz (or any possible The target frequency band), so as to avoid the low frequency band with large noise interference, and achieve the purpose of normal use. It is transmitted to the user terminal equipment NU (5) through the coaxial distribution network (3), and its built-in tunable frequency conversion chip B (4) reduces the frequency band of the data signal to 5-65MHz. In the transmission process of spectrum shifting, except for the center frequency, other parameters do not need to be changed, wh...

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Abstract

The invention discloses a coaxial line signal frequency shift transmission method based on a tunable frequency-conversion communication system. The method adopts the tunable frequency-conversion communication system to carry out transmission. The system comprises local-side equipment NC comprising a tunable frequency-conversion chip A and user-side equipment NU comprising a tunable frequency-conversion chip B, wherein the local-side equipment NC is connected with a coaxial distribution network. Ethernet data signals sent by the local-side equipment NC of EOC are processed by the tunable frequency-conversion chip A to enable a signal working frequency band to be switched to a target frequency range as needed; and the signals are transmitted to the user-side equipment NU through the coaxial distribution network, and the signal frequency is restored to the original frequency through the tunable frequency conversion chip B in the user-side equipment NU. The method effectively solves the problem of channel occupation or channel interference of various EOC systems in the practical use process, and the normal use purpose is achieved.

Description

technical field [0001] The invention relates to a transmission method of frequency shifting, in particular to a transmission method of signal frequency shifting in a coaxial line, which is applied to various systems for transmitting signals on the coaxial line, and belongs to the technical field of coaxial access. Background technique [0002] After entering the 21st century, the application of communication systems has developed by leaps and bounds. With the launch of broadband Internet services such as IPTV, HDTV, and VoIP, users have increasingly strong broadband access requirements for multimedia communications such as data, voice, and images. . As one of the networks with the widest coverage, the cable TV network (CATV) has the characteristics of wide frequency bandwidth and abundant resources. The idea of ​​transmission has given birth to many access technologies (EOC technology) based on the cable TV coaxial cable network using the Ethernet protocol. At present, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00
CPCH04L5/003H04L5/0037
Inventor 刘昱杰李力王春华秦幸坚施玉海陆晓苏邹峰邵晓刚
Owner SHANGHAI UNIV