Results 1 - 10 of 127

Fading relay channels: Performance limits and space-time signal design

by Rohit U. Nabar, Helmut Bölcskei, Felix W. Kneubühler - IEEE J. SELECT. AREAS COMMUN , 2004
"... Cooperative diversity is a transmission technique where multiple terminals pool their resources to form a virtual antenna array that realizes spatial diversity gain in a distributed fashion. In this paper, we examine the basic building block of cooperative diversity systems, a simple fading relay ch ..."
Abstract - Cited by 445 (4 self) - Add to MetaCart
Cooperative diversity is a transmission technique where multiple terminals pool their resources to form a virtual antenna array that realizes spatial diversity gain in a distributed fashion. In this paper, we examine the basic building block of cooperative diversity systems, a simple fading relay

Amplify-and-Forward Relay Beamforming for Secrecy with Cooperative Jamming and Imperfect CSI

by Sanjay Vishwakarma, A. Chockalingam
"... Abstract—In this paper, we compute worst case secrecy rates in amplify-and-forward (AF) relay beamforming with cooper-ative jamming (CJ) in the presence of imperfect channel state information (CSI). A source-destination pair aided by M relays is considered. Number of eavesdroppers J can be more than ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
than the number of relays. Out of the M relays, k1 relays (1 ≤ k1 ≤ M) act as data relays and the remaining k2 = M − k1 relays act as jamming relays. Data relays aid the communication by relaying data in AF mode, and jamming relays cooperate by transmitting jamming signals (artificial noise

EFFICIENT SECRECY MAINTAINING CERTIFICATION SCHEME FOR VANET

by P Anand , Sateesh Kumar , Mr B Dhiyanesh , Ph.D M Tech , Associate Professor, ) , Dr S Sakthivel
"... Abstract VANET are one of the new promising techniques used to enable communication on roads. Here for VANETs an efficient secrecy maintaining authentication scheme is done .To detect anonymous authentication group signature is used widely used but in previous scheme it suffers from long computatio ..."
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Abstract VANET are one of the new promising techniques used to enable communication on roads. Here for VANETs an efficient secrecy maintaining authentication scheme is done .To detect anonymous authentication group signature is used widely used but in previous scheme it suffers from long

Optimum Relay Location in Cooperative Communication Networks with Single AF Relay

by Lei Xu, Hong-wei Zhang, Xiao-hui Li, Xian-liang Wu , 2010
"... In recent years cooperative diversity has been widely used in wireless networks. In particular, cooperative communication with a single relay is a simple, practical technology for wireless sensor networks. In this pa-per, we analyze several simple network topologies. Under the condition of equal pow ..."
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In recent years cooperative diversity has been widely used in wireless networks. In particular, cooperative communication with a single relay is a simple, practical technology for wireless sensor networks. In this pa-per, we analyze several simple network topologies. Under the condition of equal

Differential transmission for amplifyand-forward cooperative communications

by Thanongsak Himsoon, Student Member, Weifeng Su, K. J. Ray Liu - Table of Integrals, Series, and Products , 2005
"... Abstract—In this letter, we propose a differential amplify-andforward (AF) transmission scheme for a two-user cooperative communications system. By efficiently combining signals from both direct and relay links, the proposed scheme provides superior performance compared to those of direct transmissi ..."
Abstract - Cited by 31 (3 self) - Add to MetaCart
Abstract—In this letter, we propose a differential amplify-andforward (AF) transmission scheme for a two-user cooperative communications system. By efficiently combining signals from both direct and relay links, the proposed scheme provides superior performance compared to those of direct

Materials for an exploratory theory of the network society.

by Manuel Castells , Anthony Giddens , Alain Touraine , Anthony Smith , Benjamin Barber , Peter Hall , Roger-Pol Droit , Sophie Watson , Frank Webster , Krishan Kumar , David Lyon , Craig Calhoun , Jeffrey Henderson , Ramon Ramos , Jose E Rodrigues-Ibanez , Jose F Tezanos , Mary Kaldor , Stephen Jones , Christopher Freeman - The British Journal of Sociology , 2000
"... ABSTRACT This article aims at proposing some elements for a grounded theor y of the network society. The network society is the social structure characteristic of the Information Age, as tentatively identi ed by empirical, cross-cultural investigation. It permeates most societies in the world, in v ..."
Abstract - Cited by 122 (0 self) - Add to MetaCart
traded. This global nancial market works only partly according to market rules. It is shaped and moved by information turbulences of various origins, processed and transmitted almost instantly by tele-communicated, information systems, in the absence of the institutional regulation of global capital ows

Multiuser Scheduling Based on Reduced Feedback Information in Cooperative Communications

by Yong-up Jang, Won-yong Shin, Yong H. Lee
"... Abstract — We introduce a multiuser (MU) scheduling method for amplify-and-forward (AF) relay systems, which opportunistically selects both the transmission mode, i.e., either oneor two-hop transmission, and the desired user. A closed-form expression for the average achievable rates is derived under ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
Abstract — We introduce a multiuser (MU) scheduling method for amplify-and-forward (AF) relay systems, which opportunistically selects both the transmission mode, i.e., either oneor two-hop transmission, and the desired user. A closed-form expression for the average achievable rates is derived

Cooperative Communication Protocols in Wireless Networks: Performance Analysis and Optimum Power Allocation

by Wireless Pers Commun, W. Su (b, K. J. Ray Liu
"... Abstract In this paper, symbol-error-rate (SER) performance analysis and optimum power allocation are provided for uncoded cooperative communications in wireless networks with either decode-and-forward (DF) or amplify-and-forward (AF) cooperation protocol, in which source and relay send information ..."
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Abstract In this paper, symbol-error-rate (SER) performance analysis and optimum power allocation are provided for uncoded cooperative communications in wireless networks with either decode-and-forward (DF) or amplify-and-forward (AF) cooperation protocol, in which source and relay send information

The relay selection and transmission trade-off in cooperative communication systems

by V. Mehta, N. B. Yim - IEEE Trans. Wireless Commun , 2010
"... A common and practical paradigm in cooperative communication systems is the use of a dynamically selected best relay to decode and forward information from a source to a destination. Such systems use two phases a relay selection phase, in which the system uses transmission time and energy to select ..."
Abstract - Cited by 13 (7 self) - Add to MetaCart
A common and practical paradigm in cooperative communication systems is the use of a dynamically selected best relay to decode and forward information from a source to a destination. Such systems use two phases a relay selection phase, in which the system uses transmission time and energy to select

On the Security of Cooperative Single Carrier Systems On the Security of Cooperative Single Carrier Systems

by L ; Wang , K J ; Kim , T Q ; Duong , M ; Elkashlan , H V Poor , Lifeng Wang , Kyeong Jin Kim , Trung Q Duong , Maged Elkashlan , H Vincent Poor
"... Abstract In this paper, the impact of multiple eavesdroppers on cooperative single carrier systems with multiple relays and multiple destinations is examined. To achieve the secrecy diversity gains in the form of opportunistic selection, a two-stage scheme is proposed for joint relay and destinatio ..."
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Abstract In this paper, the impact of multiple eavesdroppers on cooperative single carrier systems with multiple relays and multiple destinations is examined. To achieve the secrecy diversity gains in the form of opportunistic selection, a two-stage scheme is proposed for joint relay
Results 1 - 10 of 127