Methods and systems for GMM non-uniform quantization of filter multicarrier modulated optical communications

Abstract

The invention discloses a GMM non-uniform quantization system for filter multi-carrier modulation optical communication. The GMM non-uniform quantization system comprises a preprocessing module, a calculation module and an output module, wherein the preprocessing module is used for carrying out data preprocessing on a data sequence sent by a filter bank multi-carrier modulation transmitter to obtain a sample vector, and taking the sample vector as an input vector of the GMM quantization module; wherein the sample vectors comprise a real part signal sample vector and an imaginary part signal sample vector; the calculation module is used for calculating GMM parameters of an input real part signal sample vector according to an expectation maximization algorithm, estimating GMM parameters of an imaginary part signal sample vector according to the GMM parameters calculated by the real part signal sample vector, and respectively obtaining a Gaussian mixture model with the maximum responsivity; and the output module is used for inputting the sample into the Gaussian mixture model with the maximum responsivity to perform clustering operation, and obtaining and outputting a quantization result.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a method and system for non-uniform quantization of GMM used for filter multi-carrier modulation optical communication. Background technique [0002] In recent years, with the emergence of emerging technologies such as machine learning, social networks, and cloud computing, people's demand for traffic throughput and bandwidth has shown a trend of rapid growth. In order to meet the requirements of large capacity, asynchronous transmission, and objective spectrum efficiency, Intensity Modulated Direct Detection (IMDD) technology based on multi-carrier modulation technology is very popular in short-distance optical fiber links due to its simple implementation and low complexity. At the same time, compared with the traditional multi-carrier modulation technology Orthogonal Frequency Division Multiplexing (OFDM), filter bank-based multi-carrier (FBMC), universal filter m...

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Problems solved by technology

However, this scheme also has the problem that the non-parametric estimation histogram method requires a large number of samples and high computational complexity. Therefore, there is still room for optimization in the non-uniform quantization algorithm for general filter multi-carrier systems.

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