Coherent Optical Communication System Pattern-Dependent Impairment Adaptive Compensation Method and System
An adaptive compensation and coherent optical communication technology, applied in the field of optical communication, can solve the problems of high computational complexity, damage compensation, difficult multi-modulation format signals, etc., and achieve the effect of low computational complexity and easy implementation
Active Publication Date: 2020-05-08
BEIJING UNIV OF POSTS & TELECOMM
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[0004] However, the above methods all face the problem that high system performance will lead to high computational complexity and are difficult to realize in real time. At the same time, most of the existing technologies are designed for specific modulation formats, and it is difficult to dynamically and adaptively complete signal damage compensation of multiple modulation formats
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[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the Some, but not all, embodiments are invented. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0026] At present, the Nyquist WDM system mainly uses the Viterbi algorithm-based Maximum Likelihood Sequence Detection (MLSD) method combined with the backpropagation method to combat strong filtering damage and fiber nonlinear damage, or uses a maximum a posteriori probability (MAP) soft decision method to both Compensation for strong filtering impairments also compen...
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The embodiment of the invention provides a self-adaptive compensation method and system for code pattern related damage of a coherent optical communication system, and the method comprises the steps:obtaining a code pattern query table of a training sequence after code pattern training, and receiving a signal sample value code pattern; Calculating an approximate Euclidean distance between the signal sample value code pattern and each training sequence code pattern stored in the training sequence code pattern query table based on a preset Euclidean distance approximate calculation method; Andtaking the middle position symbol of the training sequence code pattern corresponding to the minimum approximate Euclidean distance as the middle position symbol estimation of the signal sample valuecode pattern to complete code pattern related damage self-adaptive compensation. According to the method, the Euclidean distance calculation of each code pattern in a received signal sample value codepattern and a training sequence code pattern query table is completed by adopting a multiplication-free approximate Euclidean distance calculation method; Therefore, maximum posterior probability detection is carried out on the received signal code pattern, code pattern related damage in the Nyquist wavelength division multiplexing system can be compensated, multiplication operation is removed inthe calculation process, the calculation complexity is low, and implementation is easy.
Description
technical field [0001] Embodiments of the present invention relate to the technical field of optical communication, and in particular to a method and system for adaptively compensating code-related impairments in a coherent optical communication system. Background technique [0002] In recent years, with the emergence of emerging network services and applications such as high-definition video communication, Internet of Things, cloud computing, virtual reality, autonomous driving, and 5G, elastic optical networks, as information-carrying highways, urgently need large-capacity, high-speed, flexible modulation, Spectrum efficiency and power efficiency are optimally adapted to the underlying optical fiber transmission technology support. The Nyquist wavelength division multiplexing (WDM) system makes the signal bandwidth equal to the baud rate through strong filtering, which can effectively improve the spectral efficiency. Strong filtering can greatly improve the spectral effic...
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IPC IPC(8): H04B10/61
Inventor 陈雪杨桃王立芊张民张治国
Owner BEIJING UNIV OF POSTS & TELECOMM