Multi-carrier light transmitting method of light access system with multi-path signal

A multi-channel signal and optical transmission technology, applied in the direction of multiplex communication, optical multiplex system, multi-frequency code system, etc., can solve the problem of decreased access data rate, increased difficulty and cost, and multi-channel carrier oscillation Complicated signal circuits and other issues, to achieve the effect of increasing the rate, realizing control links and information interaction

Inactive Publication Date: 2006-08-16
沈红
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Broadband access systems are more and more widely used, among which xDSL technology occupies the main share of access, and its number is constantly increasing; however, with the increase of access distance, the data rate of xDSL access will be greatly reduced. The input data rate will drop rapidly from tens of megabits to several megabits, or even hundreds of kilobits, which is far from meeting the needs of users. Road access to new technology is very much needed
[0003] XDSL has a relatively complete access control protocol and a large number of users. Therefore, when considering a long-distance, high-speed data access multi-user solution, it is best to completely borrow the origina

Method used

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  • Multi-carrier light transmitting method of light access system with multi-path signal
  • Multi-carrier light transmitting method of light access system with multi-path signal
  • Multi-carrier light transmitting method of light access system with multi-path signal

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Embodiment approach

[0028] The remote optical transmitting end generates a plurality of different RF frequency signals according to the signal received by the remote end that contains carrier frequency synchronization recovery information; using these RF frequency signals, more than one multi-channel input signal is modulated into different frequency signals respectively. Radio frequency carrier signal; the optical transmitter at the far end performs photoelectric conversion on the mixed signal containing all carrier signals of different frequencies superimposed, and outputs an optical transmission signal at radio frequency frequency; It is a mixed electrical signal; the remote optical receiving end extracts the reference signal in the mixed electrical signal; the remote optical receiving end generates multiple synchronous carrier oscillation signals required for local demodulation according to the received reference signal, and then transmits them separately The modulated carrier wave is demodula...

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Abstract

Though xDSL technology takes up main share in network access market, but in company with increasing access distance the access rate drops from a few of decade megabit to hundreds kilobit. The invention can keeps maximum access rate of xDSL in a long distance access and includes: a multi-carrier modulation with different frequency is used to transparently pack multi-way xDLS signal to be transmitted, and then optical transceiver outputs the multi-way xDSL signal; the transmission reference signal is used to implement the synchronous demodulation for the multi-way modulation signal; the message interaction channel is used to implement the control and interaction for devices at accessing end and accessed end.

Description

Technical field: [0001] The invention relates to a network access system, in particular to the application of the access system of an analog carrier signal. Background technique: [0002] Broadband access systems are more and more widely used, among which xDSL technology occupies the main share of access, and its number is constantly increasing; however, with the increase of access distance, the data rate of xDSL access will be greatly reduced. The input data rate will drop rapidly from tens of megabits to several megabits, or even hundreds of kilobits, which is far from meeting the needs of users. Road access to new technologies is very much needed. [0003] XDSL has a relatively complete access control protocol and a large number of users. Therefore, when considering a long-distance, high-speed data access multi-user solution, it is best to completely borrow the original protocol of XDSL; if the user access is redefined The process-specific interaction protocol will not ...

Claims

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Application Information

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IPC IPC(8): H04J14/00H04L27/26H04L25/49
Inventor 沈红
Owner 沈红
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