Non-iterative blind phase noise compensation method suitable for CO-OFDM system

A CO-OFDM and blind phase noise technology, applied in the field of non-iterative blind phase noise compensation, can solve the problems of low frequency utilization, high complexity, and poor practicability

Inactive Publication Date: 2015-12-23
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0006] In order to overcome the deficiencies of the existing CO-OFDM system phase noise compensation method, such as low frequency utilization, high complexity, high requirements on hardware resources, and poor practicability, the present invention provides a high frequency utilization, high complexity A Blind Phase Noise Compensation Method Applicable to CO-OFDM Systems with Low Requirement on Hardware Resources and Strong Practicability

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  • Non-iterative blind phase noise compensation method suitable for CO-OFDM system
  • Non-iterative blind phase noise compensation method suitable for CO-OFDM system
  • Non-iterative blind phase noise compensation method suitable for CO-OFDM system

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[0039] The present invention will be further described below in conjunction with the accompanying drawings.

[0040] refer to Figure 2 ~ Figure 6 , a non-iterative blind phase noise compensation method suitable for CO-OFDM systems, first calculate the rough estimate of the CPE of each OFDM symbol through the approximate cost function without iteration, and then use the decision-oriented phase equalization algorithm (DDPE) to calculate The residual CPE estimate is used to complete the phase noise compensation.

[0041] like 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 transmitted by optical fiber, balanced by the det...

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Abstract

The invention provides a non-iterative blind phase noise compensation method suitable for a CO-OFDM system. Non-iterative operation is performed via an approximation cost function and the CPE rough estimation value of each OFDM symbol is calculated, then the residual CPE estimation value is calculated by using a decision-directed phase equalization algorithm (DDPE), and finally phase noise compensation is completed. The cost function is introduced in calculation of the CPE rough estimation value, and the form includes the real part and the imaginary part of the frequency domain data of certain OFDM symbol after rotation of any angle. The cost function is perfectly approximated to a new cost function with a cosine function expression form, the rotation angle value is obtained when the new cost function takes the minimal value, and the rotation angle value is the CPE rough estimation value of the OFDM symbol. The invention provides the non-iterative blind phase noise compensation method suitable for the CO-OFDM system, and the non-iterative blind phase noise compensation method suitable for the CO-OFDM system is relatively high in frequency utilization rate, relatively low in complexity, low in the requirement for hardware resources, and high in practicality.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and in particular relates to a non-iterative blind phase noise compensation method suitable for a CO-OFDM system. Background technique [0002] Coherent optical OFDM is one of the most likely candidate transmission technologies for future high-speed and long-distance optical communication systems due to its outstanding ability to resist dispersion and polarization mode dispersion. [0003] CO-OFDM system structure such as figure 1 As shown, it can be divided into five modules according to their functions: CO-OFDM system transmitter module 101, optical modulation module 102, optical fiber transmission module 103, photoelectric detection module 104 and CO-OFDM system receiver module 105, CO-OFDM transmitter The electrical domain signal generated by the end module is converted into a CO-OFDM signal in the optical domain through electro-optical modulation up-conversion. The CO-OFDM sig...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L27/26
Inventor 任宏亮卢瑾薛林林覃亚丽
Owner ZHEJIANG UNIV OF TECH
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