DFE-based SVM equalization method for short-distance optical communication system

Abstract

The invention discloses a DFE-based SVM equalization method for a short-distance optical communication system. The method comprises the following steps: step 1: converting a digital signal with a training sequence into an optical signal by electro-optical modulation, sending the optical signal, converting the optical signal into an electrical signal at a receiving end, and extracting the trainingsequence by sampling; step 2: constructing a feature vector of a training code element according to a DFE structure, and calculating an optimal hyperplane by using an SVM on the basis of a characteristic value vector of the training sequence; step 3: performing judgment on an input information sequence based on the DFE structure by using the hyperplane to achieve equalization, and restoring the original signal by demodulation; step 4: storing the code element with a set length after the equalization, and converting the code element into the characteristic value of the next detected code element subjected to preamble interference through feedback input; and step 5: performing the step 2 on the information sequence after every certain length, and training the optimal hyperplane gain. By adoption of the DFE-based SVM equalization method disclosed by the invention, the problem that the receiving sensitivity of the system is reduced due to the dispersion caused by the high-speed transmission of the signal in the optical fiber and the random distributed Gaussian noise caused by the system devices is solved.

Description

Technical field [0001] The present invention relates to the field of optical transmission technology, 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 are increasingly demanding bandwidth. The current long-distance optical fiber transmission technology is becoming more and more mature, which can achieve large-capacity data transmission with relatively stable performance. The bandwidth of the access network still does not meet the needs of users, so this is to solve the problem of short-distance optical transmission. Due to the rapid upgrading of short-distance optical transmission technology, huge scale and high investment, high performance and low cost have always been key factors determin...

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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