Phase noise compensation method combining DF algorithm and LCSC algorithm in coherent light OFDM system

A phase noise compensation, coherent optical technology, applied in transmission systems, multi-frequency code systems, digital transmission systems, etc., can solve the problem of sub-carrier utilization rate decline, etc., to improve the ICI phase noise tolerance, high utilization value and other problems. Practical significance, the effect of increasing a small amount of complexity

Active Publication Date: 2019-09-24
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, the performance improvement of the SC algorithm is at the cost of losing half of the subcarrier utilization rate, and the DF algorithm needs to replace some virtual subcarriers because of the MMSE criterion, which will also lead to a decrease in the subcarrier utilization rate.

Method used

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  • Phase noise compensation method combining DF algorithm and LCSC algorithm in coherent light OFDM system
  • Phase noise compensation method combining DF algorithm and LCSC algorithm in coherent light OFDM system
  • Phase noise compensation method combining DF algorithm and LCSC algorithm in coherent light OFDM system

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Embodiment Construction

[0017] The specific implementation manners and preferred simulation examples of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0018] 1. SC scheme design based on linear combination

[0019] The basic principle of the SC scheme is to perform self-cancellation modulation on the signal at the transmitting end, and perform corresponding self-cancellation demodulation on the received signal at the receiving end to compensate for the influence of ICI phase noise. In the LCSC scheme of this patent, the data conversion of subcarriers at the sending end can be expressed as:

[0020]

[0021] Among them, D(2k) is the atomic carrier signal, X(3k) is the subcarrier signal after self-cancellation modulation, N is the number of subcarriers after linear combination self-cancellation demodulation, k=0, 1, 2,..., [N / 3-1], [·] are rounded down, and the remaining subcarriers are set to zero.

[0022] Considering the existence of ICI...

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Abstract

The invention relates to a phase noise compensation method combining a DF algorithm and an LCSC algorithm in a coherent light OFDM system, and belongs to the technical field of optical communication. The method comprises: firstly, applying a linear combination self-elimination algorithm to a sending end to encode subcarrier information, and then applying the linear combination self-elimination algorithm to a receiving end to decode the subcarrier information to obtain demodulation information and ICI related information; and then obtaining a final compensation signal by using pilot frequency information and an improved decision feedback algorithm. Simulation analysis shows that the phase noise compensation performance of the LCSC-DF algorithm constructed by the method is superior to that of a DF algorithm, when the line width of the phase noise is large, the performance is close to that of the SC-DF algorithm along with increase of the signal-to-noise ratio, the subcarrier utilization rate is higher than that of the SC-DF algorithm, and the performance of the system is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of phase noise compensation of coherent optical orthogonal frequency division multiplexing (Coherent Optical Orthogonal Frequency Division Multiplexing, CO-OFDM) system, and relates to a combination of decision feedback (Decision Feedback, DF) algorithm and linear combination self-cancellation (Linear Combination) SelfCancellation, LCSC) algorithm (ie: LCSC-DF algorithm) phase noise compensation scheme. Background technique [0002] Coherent Optical Orthogonal Frequency-Division Multiplexing (CO-OFDM) technology is a technology that combines OFDM technology, optical communication system and coherent detection. It has the advantages of high transmission rate, high anti-chromatic dispersion (Chromatic Dispersion, CD) and polarization mode dispersion (Polarization Mode Dispersion, PMD) capabilities, high spectral efficiency, and flexible allocation of bandwidth resources, and can effectively compensate the syst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/61H04L27/26
CPCH04B10/6165H04L27/2691
Inventor 袁建国南蜀崇刘书涵彭云赵鑫鑫袁江辛雪琪
Owner CHONGQING UNIV OF POSTS & TELECOMM
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