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Outage-optimal relaying through opportunistic hybrid forward cooperation

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Science china(Information Sciences) 2011年第6期54卷 1264-1273页

作者： li yubo , yin qinye & wang JunSong ministry of education key lab for intelligent networks and network security, xi’an jiaotong university, xi’an 71.049, china 1. ministry of education key lab for intelligent networks and network security Xi’an Jiaotong University Xi’an 710049 China

In this paper, a new scheme based on relay selection and data forwarding in multi-relay cooperative networks is introduced. Unlike most existing solutions focused on amplify-and-forward (AF) or decode-and-forward (DF) protocol separately, the proposed hybrid forward (HF) scheme takes advantage of both AF and DF protocols in relay forwarding. Based on theoretical analysis, a closed-form expression for the tight lower bound of its outage probability is derived, and further performance analysis is also presented. Then, in total power restricted networks, an optimal power allocation strategy between the source and the selected relay is developed to minimize the outage probability. Simulations are carried out finally, which validate the analysis and show that the HF scheme outperforms other existing ones in terms of outage probability.

关键词： cooperative diversity opportunistic cooperation outage probability power allocation diversity-multiplexing-tradeoff

An efficient ranging method based on Chinese remainder theorem for RIPS measurement

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Science china(Information Sciences) 2010年第6期53卷 1233-1241页

作者： wang chen , yin qinye & wang WenJie ministry of education key lab for intelligent networks and network security, xi’an jiaotong university, xi’an 71.049, china 1. ministry of education key lab for intelligent networks and network security Xi’an Jiaotong University Xi’an 710049 China

The radio interferometric positioning system(RIPS) measures the phase difference of the interference signal to provide high accuracy and at the same time maintain simple hardware configuration for wireless sensor ***, it suffers from phase ambiguity problem because of the periodicity of phase, which makes it hard to determine the actual distance difference only from a single phase *** solve the problem, RIPS makes multiple measurements at different frequencies so as to determine the distance difference from multiple ***, this is a computationally intensive searching process and not suitable for energyconstrained wireless sensor *** this paper, we introduce the Chinese remainder theorem(CRT) to RIPS to solve the phase ambiguity ***, we utilize some properties of the coefficients in the CRT algorithm to avoid the over-sensitivity of the traditional CRT, which increases the robustness of the *** apply this robust CRT algorithm to the ranging process which calculates the distance difference directly from a closed-form equation and therefore reduces the response time and the energy consumption of the ranging procedure.

关键词： ranging phase ambiguity Chinese remainder theorem robustness energy efficiency wireless sensor networks

Online Learning Behavior Analysis and Prediction Based on Spiking Neural networks

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Journal of Social Computing 2024年第2期5卷 180-193页

作者： Yanjing li xiaowei wang Fukun chen Bingxu Zhao Qiang Fu the Institute of education Science Research Heilongjiang UniversityHarbin 150080China the School of Cyberspace security Shandong University of Political Science and LawJinan 250014China the School of Computer Science and Technology Harbin Engineering UniversityHarbin 150001China the Faculty of Electrical and Computer Engineering University of VictoriaVictoriaV8P 5C2Canada. the Guangxi key lab of Brain-Inspired Computing and intelligent Chips School of Electronic and Information EngineeringGuangxi Normal UniversityGuilin 541004China

The vast amount of data generated by large-scale open online course platforms provide a solid foundation for the analysis of learning behavior in the field of *** study utilizes the historical and final learning behavior data of over 300000 learners from 17 courses offered on the edX platform by Harvard university and the Massachusetts Institute of Technology during the 2012-2013 academic *** have developed a spike neural network to predict learning outcomes,and analyzed the correlation between learning behavior and outcomes,aiming to identify key learning behaviors that significantly impact these *** goal is to monitor learning progress,provide targeted references for evaluating and improving learning effectiveness,and implement intervention measures *** results demonstrate that the prediction model based on online learning behavior using spiking neural network achieves an impressive accuracy of 99.80%.The learning behaviors that predominantly affect learning effectiveness are found to be students’academic performance and level of participation.

关键词： online learning learning outcomes prediction learning behavior analysis spiking neural network

Fair relay selection in decode-and-forward cooperation based on outage priority

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Science china(Information Sciences) 2013年第6期56卷 5-14页

作者： li yubo wang HuiMing yin qinye LUO Miao School of Electronic and Information Engineering Xi'an Jiaotong University State key laboratory of Integrated Services networks Xidian University ministry of education key lab for intelligent networks and network security Xi'an Jiaotong University

The opportunistic cooperation schemes,where only the "best" relay is selected to forward the message,have been widely investigated recently for their good performance in terms of outage ***,the unfair selections of relays may cause unbalance power consumptions among relays,which reduces the lifetime of energy constrained *** this paper,we introduce a novel concept of outage priority based fairness(OPF),aiming at improving the selection fairness among relays appropriately without outage performance ***,a cooperation scheme is proposed to meet this concept,and corresponding theoretical analysis is also ***,based on OPF,the achievable upper bound of the fairness is derived,and an optimal cross-layer designed scheme is also provided to achieve the *** simulations are carried out finally,which not only validate the theoretical analysis,but also show that taking advantages of the proposed schemes,the fairness among all relays,as well as the network lifetime,can be greatly improved without any loss of outage performance,especially in high SNR regime.

关键词： cooperative diversity relay fairness opportunistic cooperation outage probability