2011 IEEE 73rd Vehicular Technology Conference (VTC Spring)

15-18 May 2011

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  • VTC 2011 Spring - Title Page

    Publication Year: 2011, Page(s): i
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  • VTC 2011 Spring [Copyright page]

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  • VTC 2011 Spring Welcome from the General Chair

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  • VTC 2011 Spring TPC Co-Chairs

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  • VTC 2011 Spring Organizing Committee

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  • VTC 2011 Spring Technical Program Vice-Chairs

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  • VTC 2011 Spring TPC Members

    Publication Year: 2011, Page(s):i - xii
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  • VTC 2011 Spring Workshops

    Publication Year: 2011, Page(s):i - v
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  • VTC 2011 Spring Reviewers

    Publication Year: 2011, Page(s):i - l
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  • VTC 2011 Spring Patrons

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  • VTC 2011 Spring Final Programme

    Publication Year: 2011, Page(s):i - xxii
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  • A 2-Dimensional Transmit Beamforming Method: Performance Results for Slow Fading Channels

    Publication Year: 2011, Page(s):1 - 5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (148 KB) | HTML iconHTML

    The main concern in slow fading channels is that the coded symbols can not be sent over multiple fades of the channel, because when they are transmitted across all strong and weak subchannels of a multiple-input multiple-output (MIMO) channel, the weak subchannels play the major role in the degradation of the total performance of the channel. In this paper, we propose a 2-dimensional transmit beam... View full abstract»

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  • A 3G-802.11p Based OLT-TDMA Mechanism for Cooperative Safety in a Dense Traffic Scenario

    Publication Year: 2011, Page(s):1 - 5
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (270 KB) | HTML iconHTML

    Safety applications exploiting Vehicle-to-Vehicle (V2V) and Vehicle-to-Infrastructure (V2I) based on Vehicular Ad hoc Networks (VANETs) have made great impact on research and development in ITS. The successful delivery of the periodical safety-related beacons is the key to security of the vehicular group. To better achieve this goal, the MAC protocol has to be highly reliable and has to assure cer... View full abstract»

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  • A Chaos MIMO Transmission Scheme for Secure Communications on Physical Layer

    Publication Year: 2011, Page(s):1 - 5
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (408 KB) | HTML iconHTML

    A secure communication is achieved by upper layer applications such as common key or public key cryptosystems in current transmission systems. However, the security is never exclusive and the multiplexing of security schemes is highly effective, so a secure transmission scheme on physical layer is also important. One of the typical physical-layer schemes is a chaos transmission which produces a se... View full abstract»

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  • A Close to Capacity Double Iterative Based Precoder Design for MU-MIMO Broadcast Channel with Multi-Stream Support

    Publication Year: 2011, Page(s):1 - 5
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    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (187 KB) | HTML iconHTML

    Many algoritms have been proposed for precoders design in a multiuser MIMO system (MU-MIMO). Nevertheless, the proposed solutions showed to have better results for some SNRs (signal to noise ratio) regions and degrade in some other parts. This paper proposes a new double iterative procedure for sum-rate maximization. The proposed algorithm is based on jointly optimizing the precoders and decoders ... View full abstract»

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  • A Collaborative Context Prediction Technique

    Publication Year: 2011, Page(s):1 - 5
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (152 KB) | HTML iconHTML

    The prediction of contexts plays an important part in the field of context aware systems and environments for adapting services proactively to users' needs. To the best of our knowledge, most research literature on context prediction focused on forecasting a user's contexts only using his available context history. In the case of a user suddenly changing his behaviour in an unexpected way, the con... View full abstract»

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  • A Combinatorial Auction Based Subcarrier Allocation Algorithm for Multiuser OFDMA

    Publication Year: 2011, Page(s):1 - 5
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (158 KB) | HTML iconHTML

    The margin adaptive problem for the downlink of Orthogonal Frequency Division Multiple Access is tackled in this work. A subcarrier allocation algorithm is presented, which formulates the issue of subcarrier allocation as a combinatorial auction, where the base station auctions the OFDM subcarriers and the users compete for their allocation. A major feature of the proposed algorithm is its distrib... View full abstract»

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  • A Context-Aware Vertical Handover Framework Towards Energy-Efficiency

    Publication Year: 2011, Page(s):1 - 5
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (211 KB) | HTML iconHTML

    Current mobile devices are equipped with multi-standard interfaces to fully utilize both the existing and the imminent Public Land Mobile Network infrastructure. This flexibility comes with significant energy consumption overheads at the mobile terminal side and thus, the adopted interface / network selection scheme, a.k.a. Vertical Handover mechanism, should be based on both Quality of Service or... View full abstract»

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  • A Cooperative Incumbent User Detection for Cognitive MAC Protocol

    Publication Year: 2011, Page(s):1 - 5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (244 KB) | HTML iconHTML

    The Cognitive Radio (CR) is a recent technology that aims at increasing the spectrum utilization under the current static spectrum management. With appropriate CR MAC protocols, the unlicensed users, also called secondary users (SUs), are able to access the unused portion of spectrum in an opportunistic way. These protocols should also provide a coordinated access between the SUs and protect the l... View full abstract»

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  • A Cooperative Scheme for ZP-OFDM with Multiple Carrier Frequency Offsets over Multipath Channel

    Publication Year: 2011, Page(s):1 - 5
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (365 KB) | HTML iconHTML

    In the cooperative communication system, due to the distributed nature of the relay system, multiple carrier frequency offsets (CFOs) at different relays and multipath channels between relays cause the whole cooperative communication channel to be a doubly time-frequency selective channel. Zero-Padding Orthogonal Frequency Division Multiplexing (ZP-OFDM), which has been adopted for some wideband c... View full abstract»

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  • A Cooperative Three-Time-Slot Transmission in Asymmetric Two-Way Relay Channels

    Publication Year: 2011, Page(s):1 - 5
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (194 KB) | HTML iconHTML

    In a two-way relay system where two nodes exchange information via a half-duplex relay, the achievable data rates of both directions are limited by the weaker link. When the two-way channel is asymmetric due to relay positioning or channel fading, the sum rate of the two-way relay system will suffer from severe degradation. In this paper, we propose a novel three time-slot cooperative transmission... View full abstract»

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  • A Correlating Receiver for OFDM at Low SNR

    Publication Year: 2011, Page(s):1 - 5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (160 KB) | HTML iconHTML

    By extending OFDM symbols, acceptable BER performance can be achieved at low SNRs. Two alternative differential receiver architectures are presented, a receiver based on a FX correlator (Fourier transformation before correlation) and based on an XF correlator (correlation before Fourier transformation). To reduce the complexity and hence the power consumption of both the ADC and the first digital ... View full abstract»

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  • A Counter-Driven Adaptive Sleep Mode Scheme for 802.16e Networks

    Publication Year: 2011, Page(s):1 - 5
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (312 KB) | HTML iconHTML

    Data services, especially multimedia services drain battery quickly. Hence, it becomes more and more important to reduce power consumption in order to prolong active time of a mobile station. Three types of sleep mode schemes were defined in 802.16e for power saving. Sleep window size is either fixed or exponentially increased in these schemes. Past researches showed that power saving performance ... View full abstract»

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  • A Credibility-Based Cooperative Spectrum Sensing Technique for Cognitive Radio Systems

    Publication Year: 2011, Page(s):1 - 5
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (237 KB) | HTML iconHTML

    Spectrum sensing is one of the major elements of cognitive radio applications. A single secondary user (SU) usually cannot provide robust sensing capability due to channel effects. In order to overcome this problem, cooperative spectrum sensing techniques have been proposed. Because conventional cooperative spectrum sensing schemes assumed that all sensing nodes have the same sensing reliability, ... View full abstract»

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  • A Discrete Queue-Based Model for Soft-Decision Demodulated Correlated Fading Channels

    Publication Year: 2011, Page(s):1 - 5
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (173 KB) | HTML iconHTML

    A discrete fading channel (DFC) consisting of a binary modulated time-correlated Rayleigh fading channel used in conjunction with coherent soft-decision demodulation of resolution q is considered. The capacity of the binary input 2q-ary output DFC, which can be explicitly expressed in terms of a non-binary noise discrete channel with stationary ergodic 2q-ary noise, is evalua... View full abstract»

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