A dfe-based svm equalization method for short-distance optical communication systems

Abstract

The DFE-based SVM equalization method used in the short-distance optical communication system of the present invention includes: Step 1: The digital signal with the training sequence is converted into an optical signal through electro-optic modulation, and is converted into an electrical signal at the receiving end and extracted through sampling. Training sequence; step 2: construct the eigenvector of the training symbol according to the DFE structure, and calculate the optimal hyperplane by using SVM based on the eigenvalue vector of the training sequence; Judgment to achieve equalization, and then restore the original signal through demodulation; Step 4: Save the symbol with a set length after equalization, and input it through feedback to become the characteristic value of the next symbol to be detected that is interfered by the preamble; Step 5: Information sequence every Return to step 2 for a certain length, and retrain the optimal hyperplane. The invention solves the problem that the receiving sensitivity of the system decreases due to the dispersion caused by the high-speed transmission of the signal in the optical fiber and the randomly distributed Gaussian noise brought by the system components.

Description

technical field [0001] The invention relates to the technical field of optical transmission, in particular to an SVM (support vector machine) equalization method based on Decision feedback equalization (decision feedback equalization) for short-distance optical communication systems. Background technique [0002] With the rapid development of new services such as cloud computing, high-definition video, and virtual reality, end users have an increasing demand for bandwidth. At present, long-distance optical fiber transmission technology is becoming more and more mature, which can realize large-capacity data transmission and relatively stable performance. The bandwidth of the access network still cannot meet the needs of users, so this is to solve the problem of short-distance optical transmission. Due to the rapid upgrade of short-distance optical transmission technology, huge scale and high investment, high performance and low cost have always been the key factors determinin...

AI Technical Summary

Problems solved by technology

However, the training sequence of traditional FFE and DFE is long, which increases the channel cost to a certain extent, and cannot effectively compensate the signal when the channel weakens seriously.

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