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fully connected feedforward neural networks Based CSI Feedback Algorithm

China Communications 2021年第1期18卷 43-48页

作者： Ming Gao Tanming Liao Yubin Lu School of Telecommunication Engineering Xidian UniversityXi’an 710071China

In modern wireless communication systems,the accurate acquisition of channel state information(CSI)is critical to the performance of beamforming,non-orthogonal multiple access(NOMA),etc.However,with the application of massive MIMO in 5G,the number of antennas increases by hundreds or even thousands times,which leads to excessive feedback overhead and poses a huge challenge to the conventional channel state information feedback scheme.In this paper,by using deep learning technology,we develop a system framework for CSI feedback based on fully connected feedforward neural networks(FCFNN),named CF-FCFNN.Through learning the training set composed of CSI,CF-FCFNN is able to recover the original CSI from the compressed CSI more accurately compared with the existing method based on deep learning without increasing the algorithm complexity.

关键词： massive MIMO CSI feedback deep learning fully connected feedforward neural network

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Applying Big Data Based Deep Learning System to Intrusion Detection

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Big Data Mining and Analytics 2020年第3期3卷 181-195页

作者： Wei Zhong Ning Yu Chunyu Ai Division of Math and Computer Science University of South Carolina UpstateSpartanburgSC 29303USA Department of Computing Sciences State University of New York College at BrockportBrockportNY 14420USA

With vast amounts of data being generated daily and the ever increasing interconnectivity of the world’s internet infrastructures,a machine learning based Intrusion Detection Systems(IDS)has become a vital component to protect our economic and national security.Previous shallow learning and deep learning strategies adopt the single learning model approach for intrusion detection.The single learning model approach may experience problems to understand increasingly complicated data distribution of intrusion patterns.Particularly,the single deep learning model may not be effective to capture unique patterns from intrusive attacks having a small number of samples.In order to further enhance the performance of machine learning based IDS,we propose the Big Data based Hierarchical Deep Learning System(BDHDLS).BDHDLS utilizes behavioral features and content features to understand both network traffic characteristics and information stored in the payload.Each deep learning model in the BDHDLS concentrates its efforts to learn the unique data distribution in one cluster.This strategy can increase the detection rate of intrusive attacks as compared to the previous single learning model approaches.Based on parallel training strategy and big data techniques,the model construction time of BDHDLS is reduced substantially when multiple machines are deployed.

关键词： intrusion detection deep learning convolution neural network fully connected feedforward neural network multi-level clustering algorithm

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