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Digital modulation method, digital transmission device and equipment

A digital modulation and data technology, applied in the field of communication, can solve the problems of insufficient optical fiber communication bandwidth, etc., and achieve the effects of reducing crosstalk damage between sub-channels, narrow bandwidth, and improving spectral efficiency

Active Publication Date: 2017-07-21
北京光锁科技有限公司
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Problems solved by technology

Therefore, the problem of insufficient optical fiber communication bandwidth is gradually exposed.

Method used

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  • Digital modulation method, digital transmission device and equipment
  • Digital modulation method, digital transmission device and equipment
  • Digital modulation method, digital transmission device and equipment

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Embodiment Construction

[0044] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0045] figure 1 It is a schematic flow chart of a digital modulation method proposed by an embodiment of the present invention, refer to figure 1 , the digital modulation method, including:

[0046] 101. Perform symbol mapping on source data in each subchannel to obtain QPSK symbols;

[0047] It should be noted that the serial binary data ...

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Abstract

The invention discloses a digital modulation method, a digital transmission device and equipment. The digital modulation method comprises the following steps: implementing symbol mapping on the source data of each sub-channel to obtain quaternary phase shift keying (QPSK) symbols; grouping the QPSK symbols and performing discrete Fourier transform (DFT) to obtain frequency domain signals; implementing low-pass filtering and frequency reuse processing on the frequency domain signals of each sub-channel; implementing inverse Fourier transform on the frequency domain signals that are subjected to frequency reuse to obtain an OFDM symbol, and then transmitting the OFDM symbol after adding the OFDM symbol into a cyclic prefix (CP). According to the digital modulation method, the digital transmission device and equipment disclosed by the invention, the frequency domain signals obtained by implementing DFT on each sub-channel are separately subjected to low-pass filtering, and thus the bandwidth of modulation signals subjected to frequency domain reuse becomes narrower, the crosstalk damages caused by multiplexing multiple sub-bands can also be reduced, and the spectrum efficiency can be increased.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a digital modulation method, a digital transmission device and equipment. Background technique [0002] The explosive development of the Internet has stimulated a continuous and rapid increase in the demand for network bandwidth, and the optical communication backbone network is facing a huge demand for capacity expansion. It is traditionally believed that the bandwidth of optical fiber is wide enough, but actually there are only three low-noise communication windows, 850nm, 1310nm and 1550nm, due to optical fiber communication. The bandwidth of the communication window is relatively fixed, and the optical amplifier is also faced with its own bandwidth constraints. Therefore, the problem of insufficient optical fiber communication bandwidth is gradually exposed. [0003] Due to the relatively extensive utilization of optical fiber bandwidth in the past, the solution for o...

Claims

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Application Information

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IPC IPC(8): H04B10/516H04B10/556H04B10/61H04L27/26
CPCH04B10/5161H04B10/5561H04B10/613H04B10/6161H04B10/6164H04L27/2628H04L27/265
Inventor 高冠军张杰赵永利张会彬
Owner 北京光锁科技有限公司
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