2014 IEEE Globecom Workshops (GC Wkshps)最新文献_第4页

Achievable sum rate analysis of ZF receivers in 3D MIMO with Rayleigh/log-normal fading channels 基于瑞利/对数正态衰落信道的三维MIMO ZF接收机可达和速率分析

2014 IEEE Globecom Workshops (GC Wkshps) Pub Date : 2014-12-01 DOI: 10.1109/GLOCOMW.2014.7063533

Fangqing Tan, Hui Gao, Tiejun Lv, Jie Zeng

引用次数: 2

Service-based network selection proposal for complex heterogeneous environments 复杂异构环境下基于服务的网络选择方案

2014 IEEE Globecom Workshops (GC Wkshps) Pub Date : 2014-12-01 DOI: 10.1109/GLOCOMW.2014.7063508

Guillaume Habault, L. Toutain, N. Montavont, P. Bertin

{"title":"Service-based network selection proposal for complex heterogeneous environments","authors":"Guillaume Habault, L. Toutain, N. Montavont, P. Bertin","doi":"10.1109/GLOCOMW.2014.7063508","DOIUrl":"https://doi.org/10.1109/GLOCOMW.2014.7063508","url":null,"abstract":"In most parts of the world there are multiple ways to access a given network. Users can benefit from this plethora of access networks, as they are able to select the best possible connection at all times. However, current methods used to select the best network, mostly based on link quality, do not always guarantee that users will connect to the one best suited to their needs. Devices have different interfaces for accessing different type of technologies, which also means that the selection has to be made regardless of the type of networks the user has access to. In order to support this type of custom selection, networks need to advertise their capabilities prior to the connection process. Moreover, in addition to supporting multihoming, devices must be able to assign each applications flow towards the most suitable network. Ideally, this new connection process would be completely transparent for the user. In this paper, we present a solution to ensure that devices in this multi-access environment are able to maintain the best possible connection for each service at any given time and in any given location. This proposal allows providers to send information to devices regarding the services supported by each point of attachment to their network. This additional information helps devices select the most suitable network for each service. We define a service announcement mechanism to facilitate the advertisement of available services. This mechanism, associated with other existing protocols, enables this solution to be used with different types of access networks.","PeriodicalId":354340,"journal":{"name":"2014 IEEE Globecom Workshops (GC Wkshps)","volume":"206 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124618565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

I/Q imbalance aware widely-linear precoding for downlink massive MIMO systems 面向下行海量MIMO系统的I/Q不平衡感知宽线性预编码

2014 IEEE Globecom Workshops (GC Wkshps) Pub Date : 2014-12-01 DOI: 10.1109/GLOCOMW.2014.7063448

S. Zarei, W. Gerstacker, R. Schober

{"title":"I/Q imbalance aware widely-linear precoding for downlink massive MIMO systems","authors":"S. Zarei, W. Gerstacker, R. Schober","doi":"10.1109/GLOCOMW.2014.7063448","DOIUrl":"https://doi.org/10.1109/GLOCOMW.2014.7063448","url":null,"abstract":"In-phase/quadrature-phase (I/Q) imbalance is one of the most important hardware impairments in communication systems. It arises in the analog parts of direct conversion radio frequency (RF) transceivers and can cause large performance losses. In this paper, the impact of I/Q imbalance on the sum rate performance of downlink massive multiple-input multiple-output (MIMO) systems is analyzed and I/Q imbalance aware widely-linear precoding is considered. The proposed precoder is a widely-linear (WL) extension of the regularized zero-forcing (RZF) precoder and jointly mitigates multi-user interference and I/Q imbalance by processing the real and the imaginary parts of the transmit signal separately. Results from random matrix theory are used to derive analytical expressions for the achievable sum rate of the proposed precoder. Our analytical results show that if the number of base station antennas is much larger than the number of users, the proposed I/Q imbalance aware WL-RZF precoder achieves the same sum rate as the RZF precoder in an ideal system without I/Q imbalance. We also provide an analytical expression for the sum rate loss of the I/Q imbalance unaware RZF precoder compared to the ideal case without I/Q imbalance.","PeriodicalId":354340,"journal":{"name":"2014 IEEE Globecom Workshops (GC Wkshps)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128187634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 20

Nonlinear distortion suppression for active analog self-interference cancellers in full duplex wireless communication 全双工无线通信中有源模拟自干扰消除器的非线性失真抑制

2014 IEEE Globecom Workshops (GC Wkshps) Pub Date : 2014-12-01 DOI: 10.1109/GLOCOMW.2014.7063555

Y. Liu, Xin Quan, Wensheng Pan, S. Shao, Youxi Tang

{"title":"Nonlinear distortion suppression for active analog self-interference cancellers in full duplex wireless communication","authors":"Y. Liu, Xin Quan, Wensheng Pan, S. Shao, Youxi Tang","doi":"10.1109/GLOCOMW.2014.7063555","DOIUrl":"https://doi.org/10.1109/GLOCOMW.2014.7063555","url":null,"abstract":"Self-interference (SI) cancellation is one of the most important techniques for full duplex wireless communication. As an indispensable component, the active analog canceller (AC) needs to mitigate the analog SI to ensure it meets the analog-to-digital converter (ADC) sampling requirement. However, the active AC cancellation performance is often restricted by the nonideal electronic components, e.g., the tunable attenuator, the phase shifter and associated circuits, which introduce nonlinear distortions to the residual SI signal that enters the receive chain, as the transmit power increases. This paper presents a full duplex architecture with AC nonlinearity modeling and suppression by including an extra feedback loop right after the power amplifier and an AC nonlinear distortion modeling and cancellation process followed by SI channel estimation and digital SI cancellation. By analyzing the feedback signal feeding the AC and the residual signal after AC cancellation, the AC nonlinear distortion can be estimated and subsequently suppressed by subtracting its estimates from the received samples. The distortion-suppressed signal is then processed by the refined digital SI cancellation with channel estimation and mitigation to further improve the cancellation performance. Experiments are performed on 20-MHz Long Term Evolution-advanced signals to demonstrate the effectiveness of the proposed full duplex architecture with signal power ranging from -5 dBm to 23 dBm at the PA output while from -23 dBm to 5 dBm at the receiver front end.","PeriodicalId":354340,"journal":{"name":"2014 IEEE Globecom Workshops (GC Wkshps)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127036125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 21

Opportunistic provisioning for multicast virtual network requests 为多播虚拟网络请求提供机会

2014 IEEE Globecom Workshops (GC Wkshps) Pub Date : 2014-12-01 DOI: 10.1109/GLOCOMW.2014.7063419

D. Liao, Gang Sun, V. Anand, Hong-Fang Yu, Kexiang Xiao

引用次数: 5

Release-time aware VM placement 支持发布时间的虚拟机放置

2014 IEEE Globecom Workshops (GC Wkshps) Pub Date : 2014-12-01 DOI: 10.1109/GLOCOMW.2014.7063417

M. Dabbagh, B. Hamdaoui, M. Guizani, A. Rayes

引用次数: 27

Enhancing secrecy in fading wiretap channels with only transmitter-side channel state information 仅利用发送端信道状态信息增强衰落窃听信道的保密性

2014 IEEE Globecom Workshops (GC Wkshps) Pub Date : 2014-12-01 DOI: 10.1109/GLOCOMW.2014.7063615

Pang-Chang Lan, Y. Hong, C.-C. Jay Kuo

{"title":"Enhancing secrecy in fading wiretap channels with only transmitter-side channel state information","authors":"Pang-Chang Lan, Y. Hong, C.-C. Jay Kuo","doi":"10.1109/GLOCOMW.2014.7063615","DOIUrl":"https://doi.org/10.1109/GLOCOMW.2014.7063615","url":null,"abstract":"This work examines the advantages of having only channel state information at the transmitter (CSIT), and not at the receiver and the eavesdropper, when achieving secrecy in fading wiretap channels. The key idea is that, with only CSIT, the transmitter can pre-compensate for the amplitude and phase distortions on the main channel. This allows the receiver to decode coherently even without knowledge of the CSI, while leaving the eavesdropper confused by the unknown variations of its own channel. When the channel is reciprocal, this CSI assumption can be achieved in practice through reverse training, i.e., by having the receiver emit the training signal so that the transmitter can estimate the channel by itself. Two secrecy-enhancing transmission schemes are proposed to exploit the CSIT. The truncated channel inversion scheme is used when the receiver and the eavesdropper have no CSI available, and the truncated phase compensation scheme is adopted when they can practically measure the SNR. The achievable secrecy rates of these schemes are derived for both single-antenna and multi-antenna wireless fading scenarios. Numerical results show significant improvements in secrecy rate compared to the case with full CSI at all terminals.","PeriodicalId":354340,"journal":{"name":"2014 IEEE Globecom Workshops (GC Wkshps)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132415043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Multi-objective ACO virtual machine placement in cloud computing environments 云计算环境下的多目标蚁群算法虚拟机布局

2014 IEEE Globecom Workshops (GC Wkshps) Pub Date : 2014-12-01 DOI: 10.1109/GLOCOMW.2014.7063415

Mohammadhossein Malekloo, N. Kara

{"title":"Multi-objective ACO virtual machine placement in cloud computing environments","authors":"Mohammadhossein Malekloo, N. Kara","doi":"10.1109/GLOCOMW.2014.7063415","DOIUrl":"https://doi.org/10.1109/GLOCOMW.2014.7063415","url":null,"abstract":"Cloud computing systems provide services to users based on a pay-as-you-go model. The more services that data centers deliver to users, the more those centers need to be prepared. However, data centers consume huge amounts of energy from the environment. In order to improve data-center efficiency, resource consolidation using virtualization technology is becoming important for the reduction of the environmental impact caused by the data centers. One of the important keys in resource consolidation is the mapping of virtual machines to suitable physical machines, a procedure called virtual machine placement. The present paper focuses on this problem of virtual machine placement and proposes a multi-objective optimization approach to minimize both power consumption and resource wastage and to minimize energy communication cost between network elements within a data center. An Ant Colony Optimization (ACO) algorithm is proposed to obtain a Pareto set for a multi-objective problem. The proposed algorithms are tested using Cloudsim tools. The performances of these algorithms are compared with three well-known single-objective approaches and a multi-objective Genetic Algorithm (GA). The results demonstrate that the proposed algorithms can seek and find solutions that exhibit balance between different objectives. However, ACO is able to And better solutions than GA in terms of our objectives.","PeriodicalId":354340,"journal":{"name":"2014 IEEE Globecom Workshops (GC Wkshps)","volume":"94 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127985182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19

Cooperation for secure wireless communications with resource-bounded eavesdroppers 资源受限监听器的安全无线通信合作

2014 IEEE Globecom Workshops (GC Wkshps) Pub Date : 2014-12-01 DOI: 10.1109/GLOCOMW.2014.7063626

N. Kolokotronis, Kyriakos Fytrakis, A. Katsiotis, N. Kalouptsidis

{"title":"Cooperation for secure wireless communications with resource-bounded eavesdroppers","authors":"N. Kolokotronis, Kyriakos Fytrakis, A. Katsiotis, N. Kalouptsidis","doi":"10.1109/GLOCOMW.2014.7063626","DOIUrl":"https://doi.org/10.1109/GLOCOMW.2014.7063626","url":null,"abstract":"Wireless communications system designs are sought that rely on the potential of the physical (PHY) layer to allow a transmitter-receiver pair communicate securely in the presence of one or more eavesdroppers. Communication is performed with the help of multiple trusted relays, via the decode-and-forward (DF) protocol, and assuming knowledge of global channel state information (CSI). Instead of dealing with information-theoretic security, we assume that eavesdroppers have bounded resources, and therefore we need to assure that the transmitted information is computationally secure; this is shown to impose constraints on the maximum power of the signals received by the eavesdroppers. The optimal relay weights that maximize the signal-to-noise ratio (SNR) difference SNRd - SNRe between the destination and the eavesdroppers are determined under various (transmit, security, reliability) power constraints. Closed-form solutions are obtained in some problem formulations for one eavesdropper, whereas an iterative algorithm is proposed if more eavesdroppers are present. Simulation results indicate that a higher SNR value (compared to the non-cooperative case) is attained at the destination, while satisfying the security constraints.","PeriodicalId":354340,"journal":{"name":"2014 IEEE Globecom Workshops (GC Wkshps)","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126364575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Fundamental tradeoffs among reliability, latency and throughput in cellular networks 蜂窝网络中可靠性、延迟和吞吐量之间的基本权衡

2014 IEEE Globecom Workshops (GC Wkshps) Pub Date : 2014-12-01 DOI: 10.1109/GLOCOMW.2014.7063628

B. Soret, P. Mogensen, K. Pedersen, M. Aguayo-Torres

引用次数: 115