Non-uniform quantization system of filter multi-carrier modulation optical communication system based on SOM

Abstract

The invention discloses a non-uniform quantization system of a filter multi-carrier modulation optical communication system based on an SOM. The non-uniform quantization system comprises an SOM training module and an SOM quantization module. In the pre-training mode, the SOM training module is used for training an SOM model of a filter multi-carrier modulation signal, the module initializes model parameters and a training set, iteration is carried out through normalization, competitive learning, weight adjustment and other operations until convergence is achieved, and the obtained SOM model weight serves as a quantization level to be input into the SOM quantization module. And the quantification module does not work. In the working mode, the SOM training module is used for learning signal features on the basis of an original SOM model and adjusting the quantization level in real time; and the SOM quantization module quantizes an input data sequence according to the quantization level. According to the SOM non-uniform quantization algorithm, the quantization error of the system is reduced, the bit error rate performance of the system is improved, and the cost is saved.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and in particular relates to a non-uniform quantization system of an SOM-based filter multi-carrier modulation optical communication system. Background technique [0002] In recent years, with the emergence of emerging technologies such as machine learning, social networking, and cloud computing, people's demand for the size and type of access bandwidth is also increasing year by year, which requires the future transmission network system to be able to meet high-capacity, Diverse requirements such as asynchronous transmission and high spectral efficiency. Intensity Modulation Direct Detection (IMDD) technology is favored in the application of short-distance optical fiber links because of its simple structure and easy implementation. In addition, multi-carrier modulation technology, especially Universal filter multi-carrier (Universal filter Multi-Carrier (UFMC) technology balances ...

AI Technical Summary

Problems solved by technology

However, this method still has the problem that the number of samples used for fitting is huge, and the computational complexity and storage complexity increase sharply with the increase of quantization digits.

Images