Decision auxiliary time domain average approximation ICI phase noise compensation method suitable for CO-OFDM system

A technology of CO-OFDM and phase noise compensation, applied in the field of decision-assisted time-domain average approximation ICI phase noise compensation, can solve the problems of low frequency utilization, poor compensation effect, and high complexity

Inactive Publication Date: 2015-12-23
ZHEJIANG UNIV OF TECH
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[0007] In order to overcome the disadvantages of poor compensation effect, high complexity and low frequency utilization rate of existing phase noise estimation and compensation methods, the present invention provides a method with good compensation efficiency, low complexity and high frequency utilization rate, which is suitable for A Decision-Assisted Time-Domain Average Approximate ICI Phase Noise Compensation Method for CO-OFDM Systems

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  • Decision auxiliary time domain average approximation ICI phase noise compensation method suitable for CO-OFDM system
  • Decision auxiliary time domain average approximation ICI phase noise compensation method suitable for CO-OFDM system
  • Decision auxiliary time domain average approximation ICI phase noise compensation method suitable for CO-OFDM system

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[0050] The present invention will be further described below in conjunction with the accompanying drawings.

[0051] refer to Figure 2 to Figure 8 , a decision-assisted time-domain average approximation ICI phase noise compensation method suitable for CO-OFDM systems. This method first cuts each CO-OFDM symbol into several sub-block symbols, and averages the optical phase noise of each sub-block symbol as the ICI phase noise estimate for the subblock symbol. At the same time, in order to effectively suppress the probability of frequency-domain symbol errors, a decision threshold is set for the frequency-domain data after CPE phase noise compensation for initial decision. Then, the estimated value of ICI phase noise is calculated by combining the decision-aided estimation of symbols in the frequency domain and the approximate average of the ICI phase noise in the time domain, and finally the ICI phase noise compensation is performed.

[0052] like figure 1 As shown, the CO-...

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Abstract

The invention provides a decision auxiliary time domain average approximation ICI phase noise compensation method suitable for a CO-OFDM system. According to the method, each CO-OFDM symbol is cut into multiple sub-block symbols, and the light phase noise average value of each sub-block symbol acts as the ICI phase noise estimation value of the sub-block symbol. Meanwhile, a decision threshold is set for frequency domain data after CPE phase noise compensation to perform initial decision in order to effectively suppress the probability of error of frequency domain symbols. Then the ICI phase noise estimation value is calculated with combination of decision auxiliary estimation of the frequency domain symbols and ICI phase noise time domain approximation average, and finally ICI phase noise compensation is performed. The invention provides the decision auxiliary time domain average approximation ICI phase noise compensation method suitable for the CO-OFDM system, and the method is great in compensation efficiency, relatively low in complexity and relatively high in frequency utilization rate.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and in particular relates to a decision-assisted time-domain average approximation ICI 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 modul...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L27/26
Inventor 卢瑾任宏亮薛林林郭淑琴覃亚丽
Owner ZHEJIANG UNIV OF TECH
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