Blind equalization method for coherent optical communication based on clustering algorithm
A technology of coherent optical communication and clustering algorithm, which is applied in the signal processing field of polarization multiplexing coherent optical communication, can solve problems such as inability to strictly control the size, inability to achieve separation, difficulty in optimizing time, etc., and achieve enhanced algorithm robustness performance, improved convergence speed, and high robustness
Active Publication Date: 2020-03-20
WENZHOU UNIV
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But there are still two problems with this algorithm: first, it is very difficult to choose the optimal time for transition between two layers
If the value of ρ is too large, the desired degree of separation cannot be achieved; if the value of ρ is too small, the size of each category cannot be strictly controlled, resulting in the failure of the algorithm
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[0040] The present invention only deals with linear propagation impairments, such as chromatic dispersion (CD) and polarizing film dispersion (PMD). At the same time, the discussion of the present invention is limited to the linear damage caused by the optical fiber, and the phase recovery is not within the scope of the present invention. For systems with a transmission rate exceeding 100Gps, the symbol period is much smaller than the coherence time of the channel, so it can be assumed that all processes of the optical propagation channel are linear time-invariant.
[0041] The invention provides a method for blind equalization of a polarization multiplexing coherent optical communication system based on a clustering algorithm, comprising the following steps:
[0042] (1) signal model of the present invention such as figure 1 As shown, first, the baseband signal after the modulated symbol sequence {s(k)} (k represents the kth symbol) passes through a shaping filter g(t) (t re...
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The invention discloses a coherent light communication blind equalization method based on a clustering algorithm. A blind equalization problem of the coherent light communication system is translated into an optimization solution problem by constructing a cost function based on the clustering algorithm, and the optimization problem is solved by maximizing the probability density function logarithm of the cost function. Compared with the traditional algorithm based on the clustering, the algorithm not only greatly reduces the computation complexity, but also the step length and the variance can be self-adaptively adjusted in the algorithm convergence process. The method disclosed by the invention is suitable for the blind equalization problem of the polarization multiplexed (PolMux) coherent light communication system.
Description
technical field [0001] The invention relates to the technical field of signal processing of polarization multiplexing coherent optical communication, in particular to a blind equalization method for coherent optical communication based on a clustering algorithm. This method is suitable for high-order quadrature amplitude modulation (QAM) systems, especially when the appropriate variance and step size cannot be selected during the algorithm convergence process. It is a blind optical communication system with high robustness and low algorithm complexity. balanced approach. Background technique [0002] Today, digital coherent receivers, incorporating digital signal processing (DSP) techniques that eliminate propagation impairments, have revolutionized the way optical communication systems are designed. And with the rapid development of integration technology, DSP algorithms play an increasingly important role in ultra-high data rate coherent optical communication systems. Be...
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IPC IPC(8): H04L25/03H04L1/06H04J14/06
CPCH04J14/06H04L1/06H04L25/03089H04L25/03095H04L25/03891H04L2025/0342
Inventor 阮秀凯赵杭芳周志立戴瑜兴闫正兵朱海永肖海林韦文生谈燕花李理敏李志红
Owner WENZHOU UNIV