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Phase noise compensation method based on cp interpolation and ckf in co-ofdm system

A technology of 1. CO-OFDM and phase noise compensation, which is applied in the field of phase noise compensation based on CP interpolation and CKF, can solve problems such as constellation diagram cloud divergence, constellation diagram rotation, and increase system cost, so as to eliminate ICI and improve performance, the effect of good bit error rate performance

Active Publication Date: 2022-06-21
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

The former will cause the rotation of the constellation diagram, and the latter will cause the cloud-like divergence of the constellation diagram
To solve this problem, narrow linewidth lasers with linewidths of hundreds of kHz or less are always required at the CO-OFDM transmitter and receiver, which will increase the system cost

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  • Phase noise compensation method based on cp interpolation and ckf in co-ofdm system
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  • Phase noise compensation method based on cp interpolation and ckf in co-ofdm system

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Embodiment Construction

[0041] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0042] 1. Combine with attachment figure 1 It is a phase noise compensation method based on the combination of cyclic prefix interpolation and CKF in a CO-OFDM system proposed by the present invention, and the specific steps of the method are as follows:

[0043] (1) First, the phase noise is estimated by inserting a pilot frequency at the transmitting end, and the estimated value of the phase noise It is expressed as follows:

[0044]

[0045] Among them, S p is the inserted pilot, the angle() operation is to find the argument of the complex number, represents the estimated value of the phase noise of the mth OFDM symbol, and then uses the relationship between the cyclic prefix and OFDM to calculate the Nth OFDM symbol g sampling points and the N+Nth gphase noise θ at sampling points m,1 and θ m,2 , as shown in the formula for ...

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Abstract

The invention relates to a phase noise compensation method based on CP interpolation and CKF in a CO-OFDM system. In this method, firstly, the relationship between the cyclic prefix and OFDM is used for linear interpolation in the first order, the common phase error noise is eliminated, and the pre-judgment is performed on the first-order compensated signal, and then converted to the time domain for sub-symbol division , by dividing sub-symbols, the accuracy of compensation can be effectively improved, and part of inter-carrier interference can be eliminated. Finally, CKF filtering is used to process the residual phase noise of the signal, and the influence of residual ICI can be eliminated. The simulation results show that the proposed method can effectively suppress the influence of phase noise on the signal, improve the tolerance of the CO-OFDM system to the laser linewidth when the linewidth is large, reduce the error floor, and effectively improve the system performance.

Description

technical field [0001] The invention belongs to the technical field of phase noise compensation in a coherent optical orthogonal frequency division multiplexing system, and relates to a phase noise compensation method based on CP interpolation and CKF in a CO-OFDM system. The method mainly adopts a cyclic prefix (Cyclic Prefix, CP) interpolation method And the volume Kalman filter (Cubature Kalman Filter, CKF) method after sub-symbol processing to compensate the phase noise of the signal. Background technique [0002] Since 2006, OFDM has been introduced into optical fiber communication, and now Coherent Optical Orthogonal Frequency-Division Multiplexing (CO-OFDM) system has become an attractive technology for long-distance optical communication systems . It is a technology organically combined by optical communication system, orthogonal frequency division multiplexing technology, and coherent detection technology. Therefore, CO-OFDM has the advantages of "coherent detectio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/2691H04L27/2692H04L27/2602
Inventor 袁建国张文静余林峰李阳旭游薇
Owner CHONGQING UNIV OF POSTS & TELECOMM