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Impact of Maximum Transmit Power Limit on the First-Order and Second-Order Performance of Cognitive opportunistic relaying

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China Communications 2015年第5期12卷 75-85页

作者： JIA Xiangdong DENG Pengfei ZHOU Ming YANG Longxiang ZHU Hongbo College of Computer Science and Engineering Northwest Normal University Wireless Communication Key Lab of Jiangsu Province Nanjing University of Posts and Telecommunications Key Lab of Broadband wireless Communication and Sensor Network Technique of Ministry of Education Nanjing University of Posts and Telecommunications

Abstract： This paper focuses on the first-or- der and second-order performance of dual-hop underlay cognitive radio systems with oppor- tunistic relaying （UCR-OR） over indepen- dent and non-identically distributed （***.d） Rayleigh fading channels. For the UCR-OR systems, the tolerable maximum interference power （TMIP） Q at primary users （PUs） and the allowable maximum transmission power limit （AMTP） P at secondary users （SUs） are considered, simultaneously. We first obtain the closed-form solutions to the first-order performance such as outage probability, ave- rage symbol error ratio （SER）, and ergodic capacity （EC）. Secondly, we investigate the second-order statistical performance, i.e., ave- rage outage rate （AOR） and average outage duration （AOD）. With the consideration that in practice implementation the receiver perfor- mance is primarily influenced by the signal- to-noise ratio （SNR）（not the signal envelope）, the second-order statistical performance is investigated based on the equivalent instan- taneous end-to-end SNR. Finally, we present the detailed performance comparison analysis of UCR-OR systems by defining a random variable ,μ=Pmax/Q. The results show that the effect of μ on the first-order and second-or- der performances is different greatly. For the first-order performance, the perlbrmance gap is negligible when the value of// is relatively large. However, for the second-order one, the gap is distinct.

关键词： cognitive radio opportunistic relaying outage probability average outage rate average outage duration

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Saturation throughput analysis of the cooperative MAC with opportunistic relaying for Ad Hoc Networks

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High Technology Letters 2011年第2期17卷 134-139页

作者：李楠 Cai Yueming Cheng Naiping Hu Yingbo Department of Optical Equipment Academy Equipment Command and Technology Beijing 101416 China Department of Communication Engineerings PEA University of Science and Technology Nanjing 210007 China

In this paper, the system saturation throughput of the cooperative MAC with opportunistic relaying for ad hoc networks is evaluated by exploiting the proposed analytical model based on the Markov chain model of DCF. Both of the cooperative scheme and opportunistic relaying are considered into the analytical model. Simulations are also performed to validate the proposed analytical model. Simulation results show that the cooperative MAC with opportunistic relaying can significantly improve the system performance. Furthermore, we also reveal the impact of the opportunistic relaying on the performance from the MAC layer perspectives.

关键词： cooperative MAC opportunistic relaying Markov chain model

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opportunistic relaying Schemes for Amplify and Forward Bidirectional Relay Channels with Multi antenna Sources

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China Communications 2012年第4期9卷 71-79页

作者： Wang Zibin Yuan Fu Ding Hong Xiang Liangjun Zheng Linhua School of Electronic Science and Engineering National Uniwrsity of Defense TechnologyChangsha 410073P.R.China

We consider a two-way relay network where the Amplify-and-Forward (AF) protocol is adopted by all relays in this *** network consists of two multi-antenna source nodes and multiple distributed single-antenna *** opportunistic relaying schemes are proposed to efficiently utilize the antennas of the source nodes and the relay *** the first scheme,the best relay is selected out by a max-min-max criterion before *** that,at each source,only the antenna with the largest channel gain between itself and the best relay is activated to transmit and receive signals with full *** the second scheme,assisted by the best relay which is selected by the typical max-min criterion,both source nodes use all their antennas to exchange data,and match filter beamforming techniques are employed at both source *** analyses show that all schemes can achieve the full diversity order,and the conclusions are not only mathematically demonstrated but numerically *** performance comparisons are carried out by numerical methods in terms of rate sum and outage probability,*** beamforming assisted scheme can be found to be superior to the antenna selection scheme when accurate Channel State Information (CSI) is available at the ***,the latter is very suitable.

关键词： opportunistic relaying amplify-and-forward antenna selection beamforming two-way relay channels (TWRCs) max-min

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TWO-WAY DENOISE-AND-FORWARD NETWORK CODING opportunistic relaying AIMING AT MINIMIZING EUCLIDEAN DISTANCE IN MULTI-ACCESS PHASE

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Journal of Electronics(China) 2011年第4期28卷 433-443页

作者： Jia Xiangdong Yang Longxiang Shao Shixiang Wireless Communications Key Lab of Jiangsu Province Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 China College of Mathematics and Information Science Northwest Normal University Lanzhou 730070 China

To exploit the effect of modulation schemes on the best relay selection,a novel Jointing Modulation schemes max-min criterion(JM-max-min) is proposed firstly for Two-Way De-Noise-and-Forward(DNF) opportunistic relaying systems(TW-DNF-OR) by aiming at minimizing the Pairwise Error Probability(PEP) of Multi-Access(MA) phase which dominates the error per-formance of TW-DNF-OR due to the presence of MA *** proposed JM-max-min criterion integrates perfectly the minimum distances of constellations and the relay links ***,with the proposed JM-max-min criterion,we analyze the Symbol Error Probabilities(SEPs) of MA phase and BroadCast(BC) phase by using the approximated mathematics analysis,and present the corresponding closed-form expressions to *** numerical analysis shows,for a given modulations combination at both sources,the TW-DNF-OR systems with the proposed JM-max-min criterion outperform the one with the conventional max-min criterion.

关键词： Cooperative communications opportunistic relaying Network coding Max-min crite-rion

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Enhancement of Multicast Security with opportunistic relaying Technique over κ-μ Shadowed Fading Channels

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Journal of Computer and Communications 2022年第11期10卷 121-137页

作者： Ashik Alam Md. Zahurul Islam Sarkar Department of Electrical and Electronic Engineering Rajshahi University of Engineering and Technology Rajshahi Bangladesh

The effects of scatterers, fluctuation parameter and propagation clusters significantly affect the performance of κ-μ shadowed fading channel. On the other hand, opportunistic relaying is an efficient technique to improve the performance of fading channels reducing the effects of aforementioned parameters. Motivated by these issues, in this paper, a secure wireless multicasting scenario through κ-μ shadowed fading channel is considered in the presence of multiple eavesdroppers with opportunistic relaying. The main purpose of this paper is to ensure the security level in wireless multicasting compensating the loss of security due to the effects of power ratio between dominant and scattered waves, fluctuation parameter, and the number of propagation clusters, multicast users and eavesdroppers, by opportunistic relaying technique. The closed-form analytical expressions are derived for the probability of non-zero secrecy multicast capacity (PNSMC) and the secure outage probability for multicasting (SOPM) to understand the insight of the effects of above parameters. The results show that the loss of security in multicasting through κ-μ shadowed fading channel can be significantly enhanced using opportunistic relaying technique by compensating the effects of scatterers, fluctuation parameter, and the number of propagation clusters, multicast users and eavesdroppers.

关键词： opportunistic relaying Probability of Non-Zero Secrecy Multicast Capacity (PNSMC) Secure Wireless Multicasting Secure Outage Probability for Multicasting (SOPM) κ-μ Shadowed Fading Channel

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TWO-WAY DENOISE-AND-FORWARD NETWORK CODING opportunistic relaying AIMING AT MINIMIZING EUCLIDEAN DISTANCE IN MULTI-ACCESS PHASE

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Journal of Electronics(China) 2011年第Z1期 433-443页

作者： Jia Xiangdong* ** *** Yang Longxiang* ** Shao Shixiang* ** *(Wireless Communications Key Lab of Jiangsu Province,Nanjing University of Posts and Telecommunications,Nanjing 210003,China) **(Key Lab of Broadband Wireless Communication and Sensor Network Technology,Ministry of Education,Nanjing University of Posts and Telecommunications,Nanjing 210003,China) ***(College of Mathematics and Information Science,Northwest Normal University,Lanzhou 730070,China)

关键词： Cooperative communications opportunistic relaying Network coding Max-min crite-rion

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Device-to-Device Based Cooperative relaying for 5G Network:A Comparative Review

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ZTE Communications 2017年第B06期15卷 60-66页

作者： JIANG Wei Intelligent Networking Group German Research Center for Artificial Intelligence(DFKI)Kaiserslautern 67663Germany Department of Electrical and Computer Engineering(EIT) University of KaiserslauternKaiserslautern 67663Germany

Due to the proliferation of mobile internet access, the cellu-lar traffic is envisaged to experience a 1000-fold growth inthe second decade of the 21 st century. To meet such a hugetraffic demand, the Fifth Generation(5G) network have toadopt new techniques to substantially increase spectral effi-ciency and reliability. At the base station side, available re-sources(power supply, equipment size, processing capability,etc.) are far more sufficient than that of the terminal side,which imposes a high challenge on the uplink *** concept of cooperative communications opens a possibili-ty of using multiple terminals to cooperatively achieve spa-tial diversity that is typically obtained by means of multipleantennas in the base station. The application of Device-to-Device(D2D) communications in the 3GPP LTE system fur-ther pushes the collaboration of terminals from the theory tothe practice. The utilization of D2D-based cooperative relay-ing is promising in the era of 5G. In this paper, we compara-tively study several cooperative multi-relay schemes, includ-ing the proposed opportunistic space-time coding, in thepresence of imperfect channel state information. The numeri-cal results reveal that the proposed scheme is the best coop-erative solution until now from the perspective of multiplex-ing-diversity tradeoff.

关键词： cooperative communications Device-to-Device(D2D) Distributed Space-Time Coding(DSTC) outdated chanel stateinformation opportunistic relaying

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Enhancing Security in Multicellular Multicast Channels Reducing Interference Power with the Best Relay Selection

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Journal of Computer and Communications 2022年第1期10卷 1-26页

作者： Shaikh Muhammad Rizwan Ali Md. Zahurul Islam Sarkar Department of Information and Communication Technology BUP Dhaka Bangladesh Department of Electrical and Electronic Engineering RUET Rajshahi Bangladesh

The capacity of wireless networks is fundamentally limited by interference. A few research has focused on the study of the simultaneous effect of interference and correlation, and less attention has been paid to the topic of canceling simultaneous effect of interference and correlation until recently. This paper considers a secure wireless multicasting scenario through multicellular networks over spatially correlated Nakagami-m fading channel in the presence of multiple eavesdroppers. Authors are interested to protect the desired signals from eavesdropping considering the impact of perfect channel estimation (PCE) with interference and correlation. The protection of eavesdropping is also made strong reducing the simultaneous impact of interference and correlation on the secrecy multicast capacity employing opportunistic relaying technique. In terms of the signal-to-interference plus noise ratio (SINR), fading parameter, correlation coefficient, the number of multicast users and eavesdroppers and the number of antennas at the multicast users and eavesdroppers, the closed-form analytical expressions are derived for the probability of non-zero secrecy multicast capacity and the secure outage probability for multicasting to understand the insight of the effects of aforementioned parameters. The results show that the simultaneous effects of correlation and interference at the multicast users degrade security in multicasting. Moreover, the security in multicasting degrades with the intensity of fading and the number of multicast users, eavesdroppers and antennas at the eavesdroppers. The effects of these parameters on the security in multicasting can be significantly reduced by using opportunistic relaying technique with PCE. Finally, the analytical results are verified via Monte-Carlo simulation to justify the validity of derived closed-form analytical expressions.

关键词： Correlation Interference Power Multicellular Multicast Channel Nakagami-m Fading opportunistic relaying Probability of Non-Zero Secrecy Multicast Capacity Secure Outage Probability for Multicasting

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Outage Analysis of Incremental relaying with the Best Amplify-and-Forward Relay over Nakagami-m Fading Channels

Outage Analysis of Incremental Relaying with the Best Amplif...

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2011 IEEE 13th International Conference on Communication Technology(ICCT 2011)

作者： Kun Xu Xiaoxin Yi and Tao Peng Institute of Communications Engineering PLA University of Science and Technology 210007 Nanjing China

In this paper,we analyze the outage probability of the multiple-relay cooperative networks with opportunistic relaying and incremental relaying （OIR） over independent but not identically distributed Nakagami-m fading *** the fading severity parameters （i.e.,m） are integer,a lower bound on the outage probability is obtained,which is shown to be tight at high signal to noise ratio （SNR） *** approximate expression is also derived at asymptotic high SNR regime to analyze the diversity order of the *** diversity order of OIR is found to be the summation of all minimum values of the two fading severity parameters corresponding to each sourcerelay-destination link plus the fading severity parameter of the direct link （i.e.,the source-destination link）.The approximate expression is further shown to be tighter than the lower bound,relative to the simulated results,at medium SNR regime and coincides with it at high SNR *** results are finally presented to validate the analysis.

关键词： Incremental relaying opportunistic relaying Nakagami-m fading incremental relaying cooperative networks

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