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An Optimum Compensation Method for Phase Noise in Co-ofdm System

A CO-OFDM and system phase technology, applied in the field of phase noise optimization compensation, can solve the problems of low accuracy of phase noise estimation and poor phase noise compensation effect

Active Publication Date: 2020-05-05
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0050] The main purpose of the present invention is to overcome the problem that the phase noise estimation accuracy of the existing algorithm is not high in the large-linewidth and long-distance CO-OFDM system, which leads to poor phase noise compensation effect, and propose a phase noise optimization compensation method (modified geometry Constrained least square estimation, M-GLS) for phase noise high-precision compensation of large linewidth CO-OFDM systems

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  • An Optimum Compensation Method for Phase Noise in Co-ofdm System
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  • An Optimum Compensation Method for Phase Noise in Co-ofdm System

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Embodiment Construction

[0119] The present invention will be described in further detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0120] refer to Figure 2 to Figure 9 , a CO-OFDM system phase noise optimization compensation method, mainly related to the signal processing problem of the coherent optical orthogonal frequency division multiplexing CO-OFDM system receiving end, refer to the detailed description of the CO-OFDM system structure in the background technology.

[0121] Such as figure 1 As shown, the CO-OFDM system includes a CO-OFDM system transmitter module 101, a CO-OFDM optical modulation module 102, an optical fiber transmission module 103, a photoelectric detection module 104, and a CO-OFDM system receiver module 105. The signal generated by the system transmitter The up-conversion of optical modulation becomes the CO-OFDM signal in the optical domain. The CO-OFDM signal is transmitt...

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Abstract

The invention relates to a phase noise optimization compensation method for a CO-OFDM system. By reducing the constraint conditions of a phase noise spectrum structure, an optimization algorithm can effectively compensate the residual amplitude noise after channel equalization regardless of whether the channel estimation is accurate or not, so that the final phase noise estimation accuracy is obviously better than other phase noise estimation algorithms, and a breakthrough phase noise compensation effect is also achieved. According to the scheme of the invention, a phase noise dimensionality reduction model is applied, and the computational complexity of the phase noise optimization method is completely tolerable for the CO-OFDM system. The scheme of the invention can greatly promote the application of the CO-OFDM system in a long-distance access network and a metropolitan area network.

Description

technical field [0001] The invention belongs to the technical field of optical communication networks, in particular to a phase noise optimization compensation method of a CO-OFDM system. Background technique [0002] Coherent Optical Orthogonal Frequency Division Multiplexing (CO-OFDM) transmission technology is formed by combining the electrical domain Orthogonal Frequency Division Multiplexing (OFDM) modulation technology in the coherent optical communication system, which has the advantages of optical fiber dispersion and Polarization mode dispersion has good suppression effect, the ability to flexibly compensate system damage by digital signal processing, and high spectrum utilization. It has become one of the technologies that have attracted much attention in the fields of long-distance high-speed communication systems and optical access networks. [0003] CO-OFDM system structure such as figure 1 As shown, it can be divided into five modules according to their functi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/2525H04L25/02H04L25/03
CPCH04B10/2525H04L25/0202H04L25/024H04L25/03159
Inventor 田飞燕曹婧毛怡帆任宏亮卢瑾覃亚丽乐孜纯胡卫生
Owner ZHEJIANG UNIV OF TECH
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