2004 Symposium on Wireless Telecommunications

14-15 May 2004

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Displaying Results 1 - 25 of 51
  • Decentralized access point selection architecture for wireless LANs

    Publication Year: 2004, Page(s):137 - 145
    Cited by:  Papers (36)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (626 KB) | HTML iconHTML

    Wireless LANs have been widely deployed, and multiple access points (APs) are likely to become much more available for wireless stations (STAs) which can roam from one AP to another by some rule. We focus on an efficient and fair way to use the wireless access resources provided by multiple APs. In particular, our major concern is to develop a decentralized way to enable each STA to select an appr... View full abstract»

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  • A trivial denial of service attack on IEEE 802.11 direct sequence spread spectrum wireless LANs

    Publication Year: 2004, Page(s):129 - 136
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (530 KB) | HTML iconHTML

    The paper describes a trivial, but highly effective, denial of service attack based on commonly available IEEE 802.11 hardware and freely available software. The attack requires limited resources and is inexpensive to mount. The paper discusses the attack, its implementation, and provides an analysis of methods to achieve optimal denial of service results. While there is currently no defense again... View full abstract»

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  • Performance analysis of energy consumption in 3GPP networks

    Publication Year: 2004, Page(s):67 - 72
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (427 KB) | HTML iconHTML

    Energy conservation is critical for third generation (3G) cellular systems. In particular, future high-speed packet data services are expected to exhaust the energy of a mobile station rapidly. In 3GPP systems, the radio resource is mainly controlled by the radio resource control (RRC). This paper quantifies the energy consumption and the reconnection ratio for 3GPP systems based on the RRC state ... View full abstract»

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  • Introducing feedback congestion control to a network with IEEE 802.11 wireless LAN

    Publication Year: 2004, Page(s):61 - 66
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (494 KB) | HTML iconHTML

    The interpretation by transmission control protocol (TCP) of loss of linkage as loss due to congestion causes significant inefficiency in a wireless network. Congestion that often occurs in a wireless LAN results in further reduced performance. The paper introduces a method of controlling congestion in a network via a feedback mechanism called fair intelligent congestion control (FICC) which is us... View full abstract»

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  • Performance analysis of a cellular system supporting two types of services with different reuse factors using channel partitioning

    Publication Year: 2004, Page(s):39 - 43
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB) | HTML iconHTML

    The paper presents the performance analysis of a cellular system supporting two types of traffic with different reuse factors, using fixed channel allocation (FCA) and channel partitioning (CP), namely fixed channel partitioning (FCP). With CP, each cell is allocated two sets of channels and each set of channels supports different traffic, depending on the required reuse factor. The FCP system is ... View full abstract»

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  • Joint carrier frequency acquisition and channel estimation algorithms for OFDM systems

    Publication Year: 2004, Page(s):161 - 165
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (369 KB) | HTML iconHTML

    We present new carrier frequency acquisition and channel estimation algorithms for OFDM systems. Both new algorithms utilize only one training frame to carry out carrier frequency acquisition and channel estimation at the same time. The simulation results show that both algorithms are immune from timing error with a high precision and low computational complexity. View full abstract»

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  • Power-controlled wireless links for media streaming applications

    Publication Year: 2004, Page(s):102 - 111
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (582 KB) | HTML iconHTML

    We investigate a power-controlled transmission scheme for streaming media traffic over wireless links. The server (source) transmits encoded media packets to a client (user) over a fluctuating wireless channel. The client stores received packets into a fixed-size buffer and plays them out at a constant rate. Due to random channel interference, the source needs to adapt its transmission power and r... View full abstract»

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  • Distributed rate and power control for CDMA uplink

    Publication Year: 2004, Page(s):9 - 14
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (389 KB) | HTML iconHTML

    We consider a distributed CDMA system in which mobiles are able to control their transmission rate and power based on their radio conditions. Each mobile is assumed to be myopic, that is, its solitary goal is to maximize the payoff, which is the difference between the effective throughput and the price that the system charges for the received power on behalf of the mobile. We prove that the distri... View full abstract»

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  • Timer based dynamic location management

    Publication Year: 2004, Page(s):55 - 60
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (406 KB) | HTML iconHTML

    The mobility management schemes of current cellular systems (e.g., GSM) use spatially static location areas (LA). The mapping of cells to location areas is performed infrequently using heuristics and aggregate statistics and resulting location areas apply to all the mobile subscribers. As all the subscribers do not have the same mobility patterns, these static and globally applicable location area... View full abstract»

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  • A model for evaluating multi-route routing in ad hoc networks

    Publication Year: 2004, Page(s):149 - 153
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (343 KB) | HTML iconHTML

    An ad hoc network is a collection of wireless mobile hosts forming a temporary network without the aid of any centralized administration. In the absence of a centralized administration node, routing is a challenging issue. We focus on a particular source initiated on-demand protocol, called dynamic source routing (DSR), and show how use of multipath techniques can reduce the frequency of route dis... View full abstract»

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  • ML-based estimator for integer frequency offset estimation of OFDM systems

    Publication Year: 2004, Page(s):27 - 30
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (319 KB) | HTML iconHTML

    A novel estimator for integer frequency offset estimation of OFDM systems is derived, which is based on the maximum likelihood (ML) technique and exploits the differential information between two consecutive blocks of OFDM data symbols in the frequency domain. The reason why the ML estimator has better performance than the conventional method is analyzed. How to select the differential sequence is... View full abstract»

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  • Development and performance characterization of enhanced AODV routing for CBR and TCP traffic

    Publication Year: 2004, Page(s):44 - 51
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (517 KB) | HTML iconHTML

    We aim to modify an existing mobile ad-hoc network (MANET) reactive routing protocol (ad-hoc on-demand distance vector, AODV) into a hybrid protocol by introducing adaptive, proactive behavior to improve its performance. Under our proposed scheme, route maintenance decisions are based on predicted values of 'link-breakage times' (when the next-hop node will move out of transmission range) obtained... View full abstract»

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  • Modeling and performance analysis of mobile communication systems using adaptive beamforming technique

    Publication Year: 2004, Page(s):33 - 38
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (435 KB) | HTML iconHTML

    We propose a novel mobile communication system which employs adaptive beamforming techniques. In the proposed system, the capacity is increased by reusing the same channel (frequency, time slot or code) in a cell. The QoS (quality of service) is improved by inherent properties of smart antennas, like reducing BER (bit error rate), multipath fading, etc. We provide an analytical model for the propo... View full abstract»

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  • Middleware for multimedia mobile collaborative system

    Publication Year: 2004, Page(s):112 - 119
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (561 KB) | HTML iconHTML

    Although various collaborative systems have successfully improved enterprise work efficiency, mobile collaborative systems, which allow collaboration via wireless networks and mobile devices, still lack robust functionality and content representation support. The paper proposes a novel mobile collaboration framework for multimedia content generation, representation and delivery. A unified file for... View full abstract»

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  • Impact of inactivity timer on energy consumption in WCDMA and cdma2000

    Publication Year: 2004, Page(s):15 - 24
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (618 KB) | HTML iconHTML

    The paper provides the comparison between WCDMA and cdma2000 of the impact of an inactivity timer on the energy consumption of a mobile station. Both simulation and analysis are utilized to investigate the impact of the inactivity timer and the performance comparison between WCDMA and cdma2000. The novel and practical models proposed analyze and quantify the energy consumption in the case of burst... View full abstract»

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  • A dependence between average call duration and voice transmission quality: measurement and applications

    Publication Year: 2004, Page(s):75 - 81
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (418 KB) | HTML iconHTML

    The paper deals with the estimation of the relation between speech transmission quality and average call duration for a given network and portfolio of customers. It uses non-intrusive speech quality measurements on live speech calls. The basic idea behind this analysis is an expectation that the average call duration is higher for calls of a good quality since users are less disturbed during their... View full abstract»

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  • Impact of mobility on the performance of mobile ad hoc networks

    Publication Year: 2004, Page(s):154 - 160
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (450 KB) | HTML iconHTML

    In ad hoc networks, the mobility of nodes affects the system performance. Considerable attention has been paid to mobility models. However, most work is confined to simulation. A novel method is proposed to analyze the performance of mobile ad hoc networks (MANETs) considering the node's mobility. In the proposed method, of each communicating pair, one is considered to be stationary while the seco... View full abstract»

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  • QoS management in service specific label switched wireless networks

    Publication Year: 2004, Page(s):82 - 87
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (657 KB) | HTML iconHTML

    We consider a campus environment connected using multiple WLANs and WLAN routers providing interconnection between the WLAN networks. The servers part of WLANs in a campus network provide various services to users across the network. We have extended our earlier work related to service- and session-specific labeling, path, and switching. The extension is to support service-specific QoS and this is... View full abstract»

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  • A handoff scheme with probability-based channel borrowing in integrated wireless mobile networks

    Publication Year: 2004, Page(s):97 - 101
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (405 KB) | HTML iconHTML

    We propose and analyze a handoff scheme with channel borrowing in integrated wireless mobile networks. Channels in each cell are divided into two parts and pre-allocated to real-time and non-real-time services. Each type of service is allowed to borrow channels from the other under certain conditions. A non-real-time service call can borrow an unused channel assigned to real-time service but it ca... View full abstract»

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  • An efficient rate adaptation scheme in wireless mobile networks

    Publication Year: 2004, Page(s):88 - 93
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB) | HTML iconHTML

    A new rate adaptation algorithm named the average degradation degree fair adaptation algorithm is defined and proposed for wireless networks with mobile hosts. It uses a novel quality of service index that expresses the degradation degree suffered by data packet flows in terms of bandwidth. The aim of the proposed algorithm is to distribute the effects of QoS degradation fairly among the cells vis... View full abstract»

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  • Peak to average power ratio reduction in MC-CDMA using partial transmit sequences

    Publication Year: 2004, Page(s):3 - 8
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (413 KB) | HTML iconHTML

    MC-CDMA is an attractive technique for achieving transmission in fading channels in high data rate mobile communications. However, it requires a high quality amplifier to cope with the large amplitude fluctuation at the transmitter side. The partial transmit sequences (PTS) scheme is one of the best methods to reduce peak to average power ratio (PAPR). A modified PTS scheme for uplink communicatio... View full abstract»

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  • 2004 Wireless Telecommunications Symposium (IEEE Cat. No.04EX784)

    Publication Year: 2004
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    Freely Available from IEEE
  • Copyright

    Publication Year: 2004, Page(s):0_2 - ii
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    Freely Available from IEEE
  • 2004 Wireless Telecommunications Symposium - WTS 2004 - Title

    Publication Year: 2004, Page(s): i
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    Freely Available from IEEE
  • WTS 2004 - Table of contents

    Publication Year: 2004, Page(s):iii - v
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    Freely Available from IEEE