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CPE Compensation Method in Co-ofdm System Based on Pilot Frequency and 2D Projection Histogram

A CO-OFDM and two-dimensional projection technology, which is applied in the field of phase noise compensation based on pilots and two-dimensional projection histograms, can solve problems such as decision errors, and achieve a reduction in the number of pilots, a wide range of applications, and high spectral efficiency Effect

Active Publication Date: 2020-06-30
HANGZHOU DIANZI UNIV
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Problems solved by technology

The DD algorithm and PH do not require any pilots, and the spectrum efficiency is high, but it is only applicable to the case where the CPE is small enough to cause a decision error

Method used

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  • CPE Compensation Method in Co-ofdm System Based on Pilot Frequency and 2D Projection Histogram
  • CPE Compensation Method in Co-ofdm System Based on Pilot Frequency and 2D Projection Histogram
  • CPE Compensation Method in Co-ofdm System Based on Pilot Frequency and 2D Projection Histogram

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Embodiment Construction

[0033] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention. For this reason, the present invention uses 16QAM signals to conduct experiments to verify the effect of CPE compensation.

[0034] The present invention is used in the CPE compensation method based on pilot and two-dimensional projection histogram of CO-OFDM system, the process is as follows figure 1 As shown, at the sending end, the serial pseudo-random signal to be transmitted converts the high-rate symbol stream into multiple low-rate symbol streams through serial / parallel conversion, and inserts a sm...

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Abstract

The invention provides a CPE compensation method in a CO-OFDM system based on pilot frequency and a two-dimensional projection histogram, firstly, a few of subcarriers are adopted as pilot frequenciesto obtain phase noise values corresponding to the pilot frequencies, the approximate value range of CPE phase noise of each OFDM symbol is obtained on average, and preliminary phase noise compensation is conducted on a constellation diagram corresponding to each OFDM symbol. And then, the constellation diagram subjected to preliminary compensation on an in-phase component and an orthogonal component is respectively projected, phase noise values obtained by performing a projection histogram algorithm on the in-phase dimension and the orthogonal dimension are averaged to obtain a finer phase noise estimation value, and a final CPE phase noise compensation value in combination with the initial compensation value is obtained. The invention solves the solves the CPE phase noise compensation problem in the CO-OFDM system, and the spectral efficiency problem of the traditional pilot assisted CPE compensation method and the decision error of the conventional CPE blind estimation method and the phase deviation problem with the cycle of pi / 2.

Description

technical field [0001] The present invention relates to the field of optical transmission technology, in particular to a coherent optical orthogonal frequency division multiplexing system (Coherent Optical Orthogonal Frequency Division Multiplexing, CO-OFDM) based on pilot (Pilots-aided, PA) and two-dimensional projection Histogram (2-dimensional Projection Histogram, 2PH) phase noise compensation method. Background technique [0002] The coherent optical orthogonal frequency division multiplexing (CO-OFDM) system combines the advantages of coherent optical communication and OFDM, and has strong anti-dispersion ability, high receiver sensitivity and high spectral efficiency. Phase noise is the main impairment of the CO-OFDM system, which mainly comes from the linewidth of the laser and is caused by the phase mismatch between the transmitting end and the receiving end. First of all, OFDM is a multi-carrier modulation technology. Compared with single-carrier modulation techno...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/61H04L27/26
CPCH04B10/6165H04L27/2691
Inventor 毕美华叶玮胜杨国伟周雪芳池灏滕旭阳胡淼李齐良
Owner HANGZHOU DIANZI UNIV
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