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Radio and Wireless Symposium, 2007 IEEE

Date 9-11 Jan. 2007

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Displaying Results 1 - 25 of 162
  • [Front cover]

    Page(s): C1
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  • 2007 IEEE Radio and Wireless Symposium

    Page(s): nil1
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  • Copyright page

    Page(s): nil2
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  • Steering Committee

    Page(s): i
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  • Technical Program Committee

    Page(s): iii - iv
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  • Plenary Session

    Page(s): v
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (543 KB)  

    First Page of the Article
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  • Rump Session

    Page(s): vi
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  • Workshops WS1: UWB Over Fiber

    Page(s): vii
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  • Workshops WS2: RF Power Transistor and Amplifier Characterization Techniques

    Page(s): vii
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  • Workshop WM1: New Trends in Technology and Design Methodology for Highly Integrated MMICs and Systems on Chip

    Page(s): viii
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  • Workshop WM2: MIMO: Research and Implementation Perspectives

    Page(s): viii
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  • Workshop WM3: Wireless Networks in Harsh Environments - Propagation and Coexistence

    Page(s): ix
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  • Workshop WM4: Electromagnetic Compatibility (EMC) Aspects of Wireless Technology and Cell Phone Packaging

    Page(s): ix
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  • Short Course SF1: Recent Advances in Electrically Small and Reconfigurable Antennas

    Page(s): x
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  • Short Course SF2: Spectrum Policy and Regulation for the R&D Wireless Engineer

    Page(s): x
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  • Table of contents

    Page(s): xi - xxv
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  • Reflections on Wireless Sensing Systems: From Ecosystems to Human Systems

    Page(s): 1 - 4
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    This paper presents different applications of wireless sensing systems in environmental sensing and sensing in everyday life View full abstract»

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  • Adaptive wireless access system design for cognitive radio networks

    Page(s): 5 - 6
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    In this talk, an overview of enormous potential of improving spectral utilization by using cognitive radio is presented. The current main focus on cognitive radio design is to research and develop adaptive radio access technologies, that have lead to many challenges in physical layer, medium access control (MAC) layer and cross layer design. Moreover in the talk, research scopes and challenges that have come up in several layers are presented. Specifically, the following research issues are discussed: spectrum sensing, efficient spectrum allocation and utilization algorithms, advanced transceiver and radio interface designs for the cognitive physical layer, MAC optimization, admission control design, and enabling security mechanism. View full abstract»

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  • Software Defined Cognitive Radio Prototype toward IMT-Advanced Wireless Communication Systems

    Page(s): 7 - 10
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    This paper summarizes the current status of frequency allocation plan in Japan and discusses how to create new frequency bands for the next generation mobile communication systems. Then the needs for cognitive radio are summarized such as one of the solutions, and the current situation of the research and development is also shown. Finally, some of the research results on cognitive radio in the author's institute are shown View full abstract»

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  • A Game-Theoretic Approach to Energy-Efficient Modulation in CDMA Networks with Delay Constraints

    Page(s): 11 - 14
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    A game-theoretic framework is used to study the effect of constellation size on the energy efficiency of wireless networks for M-QAM modulation. A non-cooperative game is proposed in which each user seeks to choose its transmit power (and possibly transmit symbol rate) as well as the constellation size in order to maximize its own utility while satisfying its delay quality-of-service (QoS) constraint. The utility function used here measures the number of reliable bits transmitted per joule of energy consumed, and is particularly suitable for energy-constrained networks. The best-response strategies and Nash equilibrium solution for the proposed game are derived. It is shown that in order to maximize its utility (in bits per joule), a user must choose the lowest constellation size that can accommodate the user's delay constraint. Using this framework, the tradeoffs among energy efficiency, delay, throughput and constellation size are also studied and quantified. The effect of trellis-coded modulation on energy efficiency is also discussed View full abstract»

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  • Using Diploidy Genetic Algorithm for Dynamic OVSF Code Allocation in WCDMA Networks

    Page(s): 15 - 18
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    In this paper, genetic algorithm (GA) was applied to orthogonal variable spreading factor (OVSF) code tree reassignment problem with adaptive population size, which is constructed according to existing OVSF code tree density. In order to improve the ability of GA, we employ so-called "dominance & diploidy" structure to adapt to changing traffic conditions. Simulation results show that the GA provides reduced code blocking probability and improved spectral efficiency in the system when compared to the conventional (CCA) and dynamic code assignment (DCA) schemes View full abstract»

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  • Genetic Algorithms and Fuzzy Logic For Dynamic Channel Allocation in Cellular Radio Networks

    Page(s): 19 - 22
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    An integrated artificial intelligence optimised cellular radio channel allocation and call dropping algorithm is presented. The components of the system comprise a new genetic algorithm (GA) based channel allocation scheme, and a novel application of fuzzy logic to call dropping technique. The new method is compared to both random allocation and to a conventional allocation approach. The results show improvements of 30% in the signal-to-interference ratio and 10% in the uniformity of the traffic across the cells in the system. Furthermore, up to 80% fewer calls are dropped using the new methodology View full abstract»

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  • Effects of handover on Voice quality in wireless convergent networks

    Page(s): 23 - 26
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4949 KB) |  | HTML iconHTML  

    Fixed and mobile communications convergence scenario under the user perspective is being depicted as combination of wireless and cellular networks. This is possible by the use of multimode terminals, and application servers located in the core network, that facilitates the handover between the different base stations whatever the wireless or cellular standard is used in the convergent network. Since most of the cellular and wireless technologies were not intended to interact among themselves or even support handover, it is necessary to complement the radio network design with the impact of both horizontal handover between wireless stations, and vertical handover between wireless and cellular stations on the conversation quality. Since voice quality will in many cases be discontinuous, the present paper proposes a simple method to estimate the impact on the voice quality caused by handover discontinuities in the access network, and therefore to enable the corrective actions to ensure a satisfactory user experience View full abstract»

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  • Optimal Probing of Wireless Error Prone Channels for QoS Enhancements in IEEE 802.16 Wireless MAN

    Page(s): 27 - 30
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    Ensuring reliable and efficient packet transmission in the error prone shared radio channel is one of the ways to support QoS for integrated services in IEEE 802.16 wireless MAN network. To minimize the wasted bandwidth in transmitting corrupted packets, it is critical for the subscriber station and base station to know the channel state at and schedule the next transmission. A periodical handshake is proposed to probe the channel state for proper transmission in this paper. We built a mathematical model to determine an the optimal handshake interval. In this model, we consider the bandwidth used for transmission handshake overhead and retransmission of corrupted packets as an associated cost. Using the theory of renewal process and dynamic programming method, we obtain an optimal handshake policy under which the average cost per unit time is minimized. The numerical results are presented to demonstrate the effectiveness of our approach View full abstract»

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  • Active Inductor-Based Oscillator: A Promising Candidate for Low-Cost Low-Power Multi-Standard Signal Generation

    Page(s): 31 - 34
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    This paper presents design techniques to enhance the tuning range and improve the phase noise performance of tunable active-inductor (TAI) oscillators. Noise analysis of the TAI suggests a direct trade-off between the range of tunable inductance and the output noise. Reducing the effective feedback resistance reduces the phase noise of the VCO, but simultaneously reduces the inductive tuning range. The decrease in tuning range can be compensated by increasing the capacitance at the second port of the gyrator-based active inductor. Measurements of the TAI-based VCOs in Si-CMOS technology demonstrate a phase noise improvement of around 15 dBc/Hz. The improved TAI-based VCO achieves a tuning range of 1.3 - 3.8 GHz and phase noise as low as -94 dBc/Hz at 1 MHz offset while consuming around 5 mW from a 1.8 V supply View full abstract»

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