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

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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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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