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Noise diffusion suppression method based on RF (radio frequency) pilot frequency in high-speed optical DFT-S OFDM (discrete Fourier transform spread orthogonal frequency division multiplexing) modulation system

A DFT-SOFDM and radio frequency technology, which is applied in the field of optical fiber communication and optical network transmission, can solve the problems that the noise diffusion characteristics of the DFT-SOFDM system are not considered, the phase noise estimation method is no longer applicable, and the nonlinear distortion of the channel is not considered. Achieve the effects of improving resistance, reducing subcarrier noise, and improving performance

Inactive Publication Date: 2013-01-23
FUDAN UNIV
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Problems solved by technology

[0009] Although channel estimation and phase estimation can be used to restore the signal to a certain extent and improve transmission performance, it does not take into account the unique noise diffusion characteristics of the DFT-S OFDM system, and the recovery of phase distortion is performed after the inverse Fourier transform. The noise of each subcarrier before the transformation is not reduced
At the same time, due to the existence of noise diffusion, the continuity of the adjacent phase noise is destroyed, and the phase noise estimation method based on the inserted pilot is no longer applicable
In addition, the influence of channel nonlinear distortion is not considered in the whole recovery algorithm, and according to the nature of OFDM mentioned above, the nonlinear interference cannot be ignored

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  • Noise diffusion suppression method based on RF (radio frequency) pilot frequency in high-speed optical DFT-S OFDM (discrete Fourier transform spread orthogonal frequency division multiplexing) modulation system
  • Noise diffusion suppression method based on RF (radio frequency) pilot frequency in high-speed optical DFT-S OFDM (discrete Fourier transform spread orthogonal frequency division multiplexing) modulation system
  • Noise diffusion suppression method based on RF (radio frequency) pilot frequency in high-speed optical DFT-S OFDM (discrete Fourier transform spread orthogonal frequency division multiplexing) modulation system

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Embodiment Construction

[0036] The method for suppressing noise diffusion in DFT-S OFDM system based on the radio frequency pilot method proposed by the present invention will describe the noise diffusion mechanism and equalization algorithm implementation process completely below. At the same time, in order to reflect the effect of this scheme, it is compared with the traditional equalization scheme.

[0037] The mechanism of noise diffusion in the optical DFT-S OFDM system proposed by the present invention is described as follows.

[0038] The DFT-S OFDM signal received at the receiver can be represented as follows:

[0039] (1)

[0040] here , are the angular frequency and phase of the laser in the transmitter, respectively, Represents the time-domain baseband DFT-S OFDM signal, is the impulse response of the fiber channel, Indicates the noise in the transmission link, " " is the convolution symbol.

[0041] After photoelectric conversion, assuming that the linear di...

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Abstract

The invention belongs to the technical field of optical fiber communication and optical network transmission, and particularly relates to a noise diffusion suppression method based on RF pilot frequency in a high-speed optical DFT-S OFDM modulation system. The method mainly comprises adding an RF pilot frequency component in a DFT-S OFDM modulation signal; equalizing signals by use of the RF pilot frequency according to the characteristic of the component similar to the modulation signal that is distorted in the transmission link; and realizing nonlinear compensation and phase noise compensation at the same time. The noise diffusion suppression method provided by the invention can lower nonlinear distortion and phase noise in the DFT-S OFDM system so as to suppress the noise diffusion caused by inverse Fourier transform during DFT-S OFDM modulation, thereby improving the resistance to linear distortion and phase noise and improving the transmission performance of the system.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication and optical network transmission, and in particular relates to a method for suppressing noise diffusion based on radio frequency pilots in a high-speed optical DFT-S OFDM modulation system. Background technique [0002] The optical fiber transmission network is the supporting foundation of the entire information network. The light wave frequency of optical fiber communication is 193THz, and its 5% relative bandwidth is 10THz, thus providing a large bandwidth resource for high-speed communication. Today's increasing data network services and applications such as high-speed Internet access, mobile time-frequency voice calls, and multimedia broadcasting systems place higher requirements on the bandwidth of communication systems, requiring optical communication systems to support transmission distances of thousands of kilometers Tb / s or even higher transmission capacity. Accordin...

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Application Information

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IPC IPC(8): H04L27/26H04B10/2507
Inventor 迟楠陶理
Owner FUDAN UNIV
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