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A cable transmission method

A transmission method and cable technology, applied in distribution line transmission system, transmission system, wired transmission system, etc., can solve the problems of synchronization information deviation, 5G small base stations cannot obtain high-quality synchronization related information, etc., and achieve low price Effect

Active Publication Date: 2022-08-05
PEKING UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0010] In order to solve the technical problem that the indoor 5G small base station cannot obtain high-quality synchronization related information due to the large deviation of the synchronization information during the transmission process of the existing technology

Method used

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  • A cable transmission method
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Embodiment 1

[0063] figure 2 Shown is an embodiment of the above-mentioned HINOC-based pulse-per-second signal transmission method, and the embodiment is specifically divided into 3 steps, as follows:

[0064] 1) The HINOC central office samples the second pulse signal through a high-frequency clock, determines the rising edge time of the second pulse signal, calculates the frequency deviation between the operating frequency of the HINOC central office system and the standard second pulse signal time, and calculates the next second pulse signal. The rising edge theory reaches the moment. Because when the rising edge of the second pulse signal is captured by sampling, there will be at least one clock cycle deviation, so the higher the sampling clock frequency, the smaller the error, and the more accurate the capture of the rising edge of the second pulse signal, such as using a 200MHz clock For sampling, the minimum error is 5ns, and with a 50MHz clock, the minimum error is 20ns. Theoret...

Embodiment 2

[0072] Figure 4 It is an embodiment of a HINOC-based second pulse signal and a day time signal central office transmission device, such as Figure 4 As shown in , the central office transmission device mainly includes a time synchronization information processing module and a HINOC protocol processing module, wherein:

[0073] The time synchronization information processing module is mainly responsible for processing second pulse signal and day time signal information.

[0074] The processing flow of the second pulse signal is mainly to capture the rising edge time of the second pulse signal, obtain the HINOC central office system clock or periodic timing pulse, and calculate the deviation between the time of the previous second pulse signal and the system time by comparing, and then Calculate the theoretical time of the HINOC central office corresponding to the arrival of the next second pulse signal;

[0075] The processing flow of the time-of-day signal is mainly to rece...

Embodiment 3

[0078] Figure 5 Shown is an embodiment of a central office synchronization information processing module. For different scenarios, there may be multiple ways to deploy the time synchronization information processing module and the HINOC protocol processing module in the aforementioned central office transmission device, and this embodiment is only one of the deployment methods of the synchronization information processing module.

[0079] If the implementation is completely redesigned, the two modules can be directly fused together to make a chip or FPGA prototype, which is relatively simple to implement. The two modules can use the same source clock to calculate the second pulse signal and the time of the HINOC central office itself. The deviation between the two will be simpler, and it can be obtained directly according to the count between the rising edges of the two second pulse signals, without the need for the HINOC protocol processing module to provide periodic fixed p...

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Abstract

The present disclosure relates to the field of coaxial cable bidirectional broadband access, and specifically provides a cable transmission method, device and system. The transmission system includes: a synchronous second pulse signal and a time-of-day signal cable central office transmission device; a synchronous second pulse signal and Time-of-day signal cable terminal transmission device; coaxial transmission network for connecting the central office transmission device and the terminal transmission device, carrying HINOC protocol frame signals; data transmission ports for second pulse and time of day, used in the The second pulse signal and the time of day signal of the previous stage are received in the synchronous second pulse signal and the time of day signal cable terminal transmission device, and the second pulse and the time of day signal are transmitted in the cable terminal transmission device of the synchronous second pulse signal and the time of day signal. transmitted to the downstream small base station. The method of the present disclosure helps to solve the synchronization problem of "coaxial access + 5G" indoor coverage small base stations.

Description

technical field [0001] The present disclosure relates to the field of coaxial cable bidirectional broadband access, and more particularly, the present disclosure relates to a cable transmission method, device and system. Background technique [0002] Coaxial cable two-way broadband access technology is one of the home broadband network access technologies. Compared with other access methods, coaxial broadband access mainly uses the existing coaxial cable at home for broadband data access. There is no need for re-wiring, which can greatly save construction and material costs while providing large bandwidth. High Performance Network over Coax (HINOC) is the only industry standard for coaxial broadband access in my country. The second-generation HINOC industry standard (HINOC2.0) was released in 2016. The single-channel analog bandwidth is 128MHz, and the maximum data transmission rate can reach 1Gbps. The modulation technology adopts Orthogonal Frequency Division Multiplexing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B3/54H04J3/06
CPCH04B3/544H04J3/0638
Inventor 刘跃杨春郭海鹏高峥高云峰赵辉张诚
Owner PEKING UNIV
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