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Channel Estimation Method under Phase Noise Compensation in Coherent Optical Orthogonal Frequency Division Multiplexing System

A technology of phase noise compensation and orthogonal frequency division, applied in multi-frequency code systems, baseband system components, shaping networks in transmitters/receivers, etc., can solve problems such as phase noise interference, improve performance, realize The algorithm is simple and feasible, and the number of iterations is small

Inactive Publication Date: 2011-12-14
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0004] The purpose of the present invention is to solve the phase noise interference problem in the coherent optical OFDM system, the phase noise is mainly affected by the line width of the laser, and to provide a phase noise compensation in the coherent optical OFDM system channel estimation method

Method used

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  • Channel Estimation Method under Phase Noise Compensation in Coherent Optical Orthogonal Frequency Division Multiplexing System
  • Channel Estimation Method under Phase Noise Compensation in Coherent Optical Orthogonal Frequency Division Multiplexing System
  • Channel Estimation Method under Phase Noise Compensation in Coherent Optical Orthogonal Frequency Division Multiplexing System

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Embodiment 1

[0036] Such as figure 1 Shown is the CO-OFDM system to which the channel estimation method under phase noise compensation is applied. The CO-OFDM system with a transmission rate of 20Gbps is verified, in which there are 210 data subcarriers, one pilot is set for every 10 data subcarriers, the n value of the inverse Fourier transform (IFFT) is 256, and the cyclic prefix CP is set to 12.5%, the fiber dispersion is 17ps / km / nm, and the transmission is 800km. First, the 4QAM modulation method is adopted, and the laser line width is set to a low line width of 10kHz. At this time, the noise only considers the phase noise change during modulation during end-to-end transmission, and does not consider additive noise; when transmitting a certain distance, multiplicative noise is considered. and additive noise. The noise at low linewidth can be simplified to a linear relationship, while it is a nonlinear relationship at a high linewidth of 1.5MHz.

[0037]First, the phase change parame...

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Abstract

The invention relates to a channel estimation method under phase noise compensation in a coherent optical OFDM system, which belongs to the technical field of optical fiber communication and signal processing. The method includes: aiming at different linewidths of the laser, calculating the sum of the phase change parameters of the laser in the high linewidth and low linewidth transmission distance L, and the phase change parameter between the high linewidth and the low linewidth is, using The formula calculates the weight parameters of fusion. The phase change parameters between high line width and low line width and high line width are weighted and corrected respectively, and the phase change parameters of high line width can be corrected a second time according to the curve fitted by multiple weights . The least squares algorithm is selected, and the second iteration completes the estimation of the entire channel. Compared with other algorithms, the present invention can flexibly switch between high and low line widths of the laser, and achieve adaptive compensation of phase noise under different line widths by adjusting the weight coefficients, while significantly improving the high line width. wide system performance.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication and signal processing, and specifically relates to channel equalization compensation and the like. Background technique [0002] Coherent optical orthogonal frequency division multiplexing (CO-OFDM), as a new technology for high-speed optical network communication systems, has the advantage of compensating for intersymbol interference (ISI) caused by chromatic dispersion (CD) and polarization mode dispersion (PMD). But the coherent optical OFDM system is very sensitive to the phase noise of the laser, which will cause common phase error (CPE) and inter-channel interference (ICI). At present, many experts and scholars at home and abroad are studying how to reduce the influence of phase noise. The CPE will rotate all subcarriers by a certain angle, which is relatively easy to restore. However, the ICI destroys the orthogonality of sub-carriers. If it is not eliminated, it will ...

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Application Information

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IPC IPC(8): H04L27/26H04L25/02H04L25/03
Inventor 童峥嵘郭敏杰陈乾杨秀峰曹晔
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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