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Wireless, Mobile and Multimedia Networks (ICWMMN 2008), IET 2nd International Conference on

Date 12-15 Oct. 2008

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Displaying Results 1 - 25 of 133
  • A merger weight-based synchronization algorithm for WiMedia MAC

    Publication Year: 2008, Page(s):163 - 166
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (561 KB)

    WiMeida MAC, coupled with physical layer based on UWB technology, is now widely applied in high data rate wireless personal area networks (WPANs). Because the transmission with the UWB technology is restricted to a short range, multiple piconets may exist in a network at the same time. We investigate problems related to beacon collisions and data communication disruptions when piconets interfere i... View full abstract»

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  • Improving upper bound on the capacity of planar wireless networks with omnidirectional antennas

    Publication Year: 2008, Page(s):191 - 194
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (807 KB)

    In this paper, we improve the upper bounds on the maximum number of simultaneously successful wireless transmissions and the maximum achievable per-node end-to-end throughput under the same general network scenario as in Arpacioglu and Haas (2004) [1]. View full abstract»

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  • An energy efficient routing protocol based on cluster head forecasting and power controlling

    Publication Year: 2008, Page(s):187 - 190
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (613 KB)

    Due to the constrained energy of nodes without supply in wireless sensor networks, how to reduce energy consumption of nodes becomes the important target of routing protocols. An energy efficient routing protocol based on cluster head forecasting and power controlling (CHFPC) was proposed. In CHFPC, cluster head is forecasted based on both energy and distance parameters, and power controlling is i... View full abstract»

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  • A CDMA-assisted seamless handover scheme for WLAN

    Publication Year: 2008, Page(s):183 - 186
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (694 KB)

    With the development of WLAN (Wireless Local Area Network) technologies, many hotspots have been deployed and mobile devices can get Internet services through WLAN in many places. Some schemes based on the RSS (Receive Signal Strength) have been proposed to provide the seamless handover between WLANs. However, they can not avoid the ping-pong effect, and the handover performance is always influenc... View full abstract»

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  • A new test rule of local mean of a mobile radio signal

    Publication Year: 2008, Page(s):179 - 182
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (621 KB)

    The pivotal parameters, which include statistical interval, sampling interval and sampling points, of the local mean of a mobile radio signal is described. A new test rule of estimate of local mean of a mobile radio signal is deduced by considering the correlation between different sampling points, the mutual influence between statistical interval and sampling interval, based on the mean estimate ... View full abstract»

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  • One type of GSM-R fast handover algorithm for high-speed railway

    Publication Year: 2008, Page(s):175 - 178
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (550 KB)

    With the construction of high-speed railway and passenger-dedicated railway, GSM-R digital mobile communication system is developing fast in China. Meanwhile it brings some problems demanding to be solved promptly, fast and reliable handover is one of them. In this paper, a new type of fast handover algorithm which is applied in high-speed railway is present, analysis is made on implementation met... View full abstract»

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  • Research on integrated network management model based on CORBA and mobile agents

    Publication Year: 2008, Page(s):135 - 138
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (439 KB)

    CORBA and mobile agents are two popular network management technologies. This research investigates these two technologies and some existing integrated approaches thoroughly. Based on this investigation, a novel network management model is proposed, which provides a comprehensive, efficient approach to network management, by integrating CORBA and mobile agents technologies into a unified model and... View full abstract»

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  • A fast Automatic Gain Control scheme for IEEE 802.15.4 receiver

    Publication Year: 2008, Page(s):167 - 170
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (646 KB)

    The requirements for IC core based on IEEE 802.15.4 are fast computing and low complexity which challenge the traditional Automatic Gain Control (AGC) design. This paper presents a fast AGC scheme for IEEE 802.15.4 receiver, which can quickly accomplish gain adjustment in less than 1.5 symbols. Relating to numeric constant parameters determining the gain convergence speed and the number of samples... View full abstract»

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  • New decoding algorithms for super-symmetric rank codes

    Publication Year: 2008, Page(s):204 - 207
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (612 KB)

    New decoding algorithms for the super-symmetric rank codes [1] are constructed. They include the recurrent decoding algorithm and the majority decoding algorithm. The super-symmetric rank codes are rank-metric codes over binary fields with lengths Ns = 2s, s = 0, 1, …, where codes of length Ns are designed recursively from codes of length N... View full abstract»

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  • Adaptive image delivery based on WAP

    Publication Year: 2008, Page(s):159 - 162
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (501 KB)

    The limited display capability, storage, processing ability and the changing bandwidth of wireless network are main obstacles for mobile devices to access the images on website using WAP technology. This paper proposes a new method to design a WAP gateway, which can modify the images on website automatically according to Quality of Service (QoS). The quality of images on website, the capability of... View full abstract»

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  • Satellite imaging traffic modeling and simulation

    Publication Year: 2008, Page(s):155 - 158
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (780 KB)

    The satellite imaging traffic modeling and simulation is mainly discussed in this thesis. Firstly, there are two kinds of satellite reconnaissance imaging traffic models are built. They are focus and bar scan. And some calculation examples of them are given according to the parameters of “Starlite” reconnaissance satellite constellation of U.S. Secondly, the information storage capac... View full abstract»

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  • Study on interference suppression for UWB communications

    Publication Year: 2008, Page(s):151 - 154
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (749 KB)

    In this paper, the performance of interference suppression method named adaptive modified template waveform (AMRTW) is analyized. Due to the disadvantages of interference suppression for this method, a novel algorithm for sub-band signal decomposition is proposed in this paper. By the signal sub-band weighted parameters adjustment, this new algorithm can improve the performance of the AMRTW techno... View full abstract»

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  • On increasing system throughput for non real-time users using hierarchical modulation in IEEE802.16 network

    Publication Year: 2008, Page(s):147 - 150
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (373 KB)

    In this paper, we propose a novel cross-layer approach of opportunistic scheduling to increase system throughput for IEEE 802.16 downlink transmission. Traditionally wireless users are scheduled according to the type of their subscribed service. The key idea of this paper is to combine hierarchical modulation with opportunistic scheduling, which not only yields a larger over-all system throughput,... View full abstract»

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  • Integrating MANET and the internet via an adaptive TTL gateway discovery scheme

    Publication Year: 2008, Page(s):143 - 146
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (650 KB)

    Gateways act as bridges for forwarding data packets between integrated mobile ad-hoc networks (MANETs) and the Internet. Mobile nodes in MANETs must discover available gateways to gain access to the Internet. This study presents an adaptive gateway discovery scheme that balances efficiency and overhead by limiting the flooding scope of gateway advertisement messages. The proposed scheme dynamicall... View full abstract»

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  • Performance analysis of SCPS-TP SNACK in space communication

    Publication Year: 2008, Page(s):1 - 4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (675 KB)

    TCP has been a robust and efficient protocol for terrestrial networks, but it does not fare very well in the space environment because of the long-link delay, high bit-error-rate, asymmetric bandwidth, intermittent links compare with the terrestrial networks. However, it does provide an excellent base for extension. The Space Communications Protocol Standards (SCPS) has proposed Transport Protocol... View full abstract»

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  • Smooth handoff in infrastructure wireless mesh networks

    Publication Year: 2008, Page(s):171 - 174
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (450 KB)

    Supporting user mobility is an important requirement for wireless mesh networks. We propose a relay-router buffering-and-forwarding scheme for supporting smooth handoff in the infrastructure wireless mesh networks. Our proposal is based on buffering packets at intermediate relay routers in the packets forwarding route and neighbouring relay routers working in promiscuous mode which can overhear th... View full abstract»

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  • A modified weighted bit-flipping algorithm for LDPC codes

    Publication Year: 2008, Page(s):227 - 230
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (669 KB)

    In this paper, a modified weighted bit-flipping (WBF) algorithm is proposed for finite geometry Low-Density Parity-Check (FG-LDPC) codes. The calculation for the flipping function in the new method includes all the elements in sum product algorithm (SPA) instead of the minimum one in most existing methods. Simulation results show that the proposed method exhibits better performance than the best m... View full abstract»

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  • Robustness of complex cooperative communication network

    Publication Year: 2008, Page(s):260 - 263
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (740 KB)

    The research on robustness is an important issue for complex networks. Recently, to improve the communication performances, wireless cooperative communication has become a promising way. Therefore, to achieve better benefits of cooperative communication, the robustness research on complex cooperative communication network — CCCN is necessary. In this paper, the network evolution model for C... View full abstract»

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  • Particle swarm optimization for MIMO receivers

    Publication Year: 2008, Page(s):255 - 259
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (788 KB)

    MIMO receivers need to have good knowledge about channel. To get good channel estimation needs to good pilot sequences and good channel estimator. The good pilot sequences can ensure the channel estimator converge the channel parameters by short length of pilot sequences, while good channel estimator can employ fewer iteration to estimate channel parameters. To reach the first goal, this paper pro... View full abstract»

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  • Channel estimation based on iterative interpolation for wireless communication in OFDM system

    Publication Year: 2008, Page(s):251 - 254
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (993 KB)

    OFDM has become the hotspot in the research of wireless communication, and channel estimation is one of the key techniques of OFDM. In this paper, a channel estimation algorithm based on iterative interpolation for wireless communication is proposed. This algorithm first obtains initial estimate of the next receiving symbol, then the precise estimate is acquired by the amendment of the frequency r... View full abstract»

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  • A robust decision-directed channel estimator for OFDM systems

    Publication Year: 2008, Page(s):247 - 250
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (876 KB)

    This paper deals with the estimation of channel frequency response in orthogonal frequency division multiplexing (OFDM) systems. Since existing DD estimators such as LS estimator and the MMSE estimator do not appropriately reduce the influence brought by incorrect decision, and hence suffer from error propagation. Then, in order to mitigate error propagation in DD channel estimation, a DD estimato... View full abstract»

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  • Adaptive multiuser detection based on Gibbs sampler

    Publication Year: 2008, Page(s):243 - 246
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (839 KB)

    We present an adaptive multiuser detection scheme in multipath channel for coding CDMA systems. The scheme uses the Gibbs sampler[1] to estimate the channel gains and the transmitted symbols. In receiver, the channel decoder delivers information about the code bits prior distributions, which can be fed back to the multiuser detector to refine its detection processing. We estimate the BER of the fe... View full abstract»

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  • Analysis of group multiuser detection based on coalitional game

    Publication Year: 2008, Page(s):239 - 242
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (546 KB)

    The issue of group-blind multiuser detection in MAC channel among wireless nodes in the environment of multiple networks coexisting and sharing spectrum is addressed under the Framework of coalitional game. We investigate the performance and stability of multiple access channel (MAC) with linear decorrelating multiuser detection under varying SNR, channel gains and coalitional structures, in which... View full abstract»

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  • Opportunistic network coded information exchange among multi-user

    Publication Year: 2008, Page(s):195 - 199
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (903 KB)

    This paper investigates the strategies of relaying based on opportunistic network coding over wireless communication context with two pairs of users and one common relay exchanging their data, where the relay node can transmit either network-coded or un-coded packets. Resorting to a Markov model, the paper characterizes the average packet delay and energy power consumed by the relay node. The resu... View full abstract»

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  • Crossover product accumulate codes: EXIT analysis and performance

    Publication Year: 2008, Page(s):231 - 234
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1098 KB)

    Crossover product accumulate (CPA) codes, proposed recently, are a novel class of provably good error-correcting codes with low encoding and decoding complexity. In this paper, EXIT chart is used to predict the SNR convergence threshold of CPA codes. Iterative decoding stop criteria are proposed for CPA codes, and are used to simulate the performance of CPA codes. Analysis and simulations show tha... View full abstract»

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