2008 IET Seminar on Wideband and Ultrawideband Systems and Technologies: Evaluating current Research and Development

6-6 Nov. 2008

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Displaying Results 1 - 17 of 17
  • State-space modeling of neural signals

    Publication Year: 2008, Page(s):1 - 58
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (83400 KB)

    Neural systems encode representations of biological signals in the firing patterns of their spike trains. Spike trains are point process time-series and their codes are both dynamic and stochastic. Although the signal is often continuous, its representation in the nervous systems is as a high-dimensional point process time-series. Because neural spike trains are point processes, standard signal pr... View full abstract»

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  • Time domain UWB radio channel characterisation for body-centric wireless communications in indoor environment

    Publication Year: 2008, Page(s):1 - 4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (4576 KB)

    The effect of human body and indoor environment in the ultra wide band (UWB) radio propagation channel is presented. Time domain measurements are performed in the body-centric wireless sensor laboratory, Queen Mary, University of London. In order to characterize the on-body radio channel, the transmitter has been placed on the belt, and the receiver is moved on 33 different Line of Sight (LOS) pos... View full abstract»

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  • Co-located versus cooperative MIMOs

    Publication Year: 2008, Page(s):1 - 11
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (23239 KB)

    The family of classic space time block coding techniques designed for co-located antenna elements is capable of providing a high diversity gain in the context of co-located MIMO systems, provided that the antenna elements are sufficiently far apart, in order to experience independent fading. However, in realistic shadow-fading environments their diversity gain erodes owing to the correlated fading... View full abstract»

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  • UWB spectral line analysis and suppression in low rate UWB radio

    Publication Year: 2008, Page(s):1 - 5
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (3174 KB)

    Ultra Wide Band (UWB) Radio has now become established as a leading candidate for next communication systems including 4G. In low rate UWB the evaluation of the average power spectral density and average autocorrelation signals are particularly important in spectrum shaping for the suppression of unwanted spectral lines that appear in the envelope due to unbalanced input data streams and modulatio... View full abstract»

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  • Joint antenna selection for MIMO-OFDM systems over spatially correlated channels

    Publication Year: 2008, Page(s):1 - 5
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (3771 KB)

    The capacity and bit error rate (BER) performance of joint antenna selection at the transmitter and receiver for multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems has not been examined over spatially correlated channels. We present a novel low complexity joint antenna selection algorithm based on the adaptive Markov chain Monte Carlo (AMCMC) optimization... View full abstract»

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  • Low-Energy Minimum Mean-distance algorithm for wireless sensor networks

    Publication Year: 2008, Page(s):1 - 4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1175 KB)

    A novel cluster-head selection algorithm using the minimum mean distance between sensor nodes as a selection parameter for wireless sensor networks is presented. The proposed algorithm takes 1.65 times longer to reach the point where 50% sensor nodes remain alive, and achieves 1.33 times longer overall network lifetime than the low energy adaptive clustering hierarchy protocol (LEACH) while mainta... View full abstract»

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  • Low-Energy Minimum Mean-distance algorithm for wireless sensor networks

    Publication Year: 2008, Page(s):1 - 4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1273 KB)

    A novel cluster-head selection algorithm using the minimum mean distance between sensor nodes as a selection parameter for wireless sensor networks is presented. The proposed algorithm takes 1.65 times longer to reach the point where 50% sensor nodes remain alive, and achieves 1.33 times longer overall network lifetime than the Low Energy Adaptive Clustering Hierarchy protocol (LEACH) while mainta... View full abstract»

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  • Non-uniform temporal dispersion in indoor wideband channels

    Publication Year: 2008, Page(s):1 - 2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2486 KB)

    The analysis of the time domain dispersion of wideband and ultrawideband (UWB) multipath channels is an active research topic. Such a channel can be viewed as an all pole filter and a joint time-frequency analysis of its frequency response can show the temporal dispersion characteristics of the channel. It has been assumed conventionally that the signal dispersion patterns at the temporal taps of ... View full abstract»

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  • OFCDM - A promising wireless multiple access technique for 4G mobile communications

    Publication Year: 2008, Page(s):1 - 10
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (47044 KB)

    Future mobile communication systems aim to provide extremely high speed data transmission, especially in downlink. The broadband orthogonal frequency and code division multiplexing (OFCDM) system with two-dimensional spreading (time and frequency domain spreading) is becoming a very promising technique for high speed wireless communications due to its advantages over OFDM. This talk presents the f... View full abstract»

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  • Simulation of UWB distortion combined with indoor spatio-temporal channels

    Publication Year: 2008, Page(s):1 - 5
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (149 KB)

    The modified aspects for simulating UWB multipath channels are presented in this paper. Pulse distortion mechanisms based on the geometric optics and the geometric theory of diffraction are specifically generated combing with the spatio-temporal characteristics of multipath clusters based on 3times3 planar array systems. In each particular scenario, model parameters such as angle-of-arrival, angle... View full abstract»

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  • A converged ultra-broadband home network

    Publication Year: 2008, Page(s):1 - 21
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (55696 KB)

    OMEGA will realize ubiquitous distribution of electronic media and internet services in the home with high quality and reliability • Seamless convergence of wired AND wireless technologies • Satisfy quality of experience without effort for the user •Development of new generation of gigabit throughput network and service infrastructures • Substantial progress in the fiel... View full abstract»

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  • A comparison of CP-OFDM with IOTA-OFDM under typical system imperfections

    Publication Year: 2008, Page(s):1 - 5
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (3012 KB)

    In this paper we compare the performance of OFDM with a cyclic prefix (CP) and isotropic orthogonal transform algorithm (IOTA) OFDM without cyclic prefix under typical system imperfections such as channel estimation errors and frequency offset. The IOTA-OFDM system is based on offset quadrature amplitude modulation (OQAM) and promises an increased immunity to both inter-carrier interference (ICI) ... View full abstract»

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  • On the mathematical modelling and spatial distribution of UWB frequency dependency

    Publication Year: 2008, Page(s):1 - 5
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2915 KB)

    Increasing the instantaneous bandwidth of wireless transmission pose new challenges to the design of communication devices. Apart from observing notches in the frequency domain, ultra wideband (UWB) signals also suffer from spatial variations in power, as a function of frequency, which are known as frequency dependent path-loss. To have more insight into this problem, we have conducted fundamental... View full abstract»

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  • Enhanced MIMO for IMT-advanced wireless systems

    Publication Year: 2008, Page(s):1 - 21
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (79501 KB)

    Ultra wideband (UWB) technology combined with multiple transmit and receive antennas (MIMO) is a viable way to achieve data rates of more than several Gb/s for wireless communications. UWB is typically applied to short range and therefore mainly indoor communications in environments characterized by dense multipath propagation. For this type of environments, MIMO systems allow for a significant in... View full abstract»

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  • A wearable monopole antenna for ultra wideband with notching function

    Publication Year: 2008, Page(s):1 - 5
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (556 KB)

    This paper proposes a flexible wearable ultra-wideband antenna suitable for 802.15.3a WPAN applications. The design incorporates a notch at 5 GHz for providing WLAN compatibility. The effects of antenna shape and the loss properties of the substrate on the resonant performance are discussed with reference to the notch band. A novel neoprenecopy substrate is characterised in this paper. Measured re... View full abstract»

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  • Characterisation of powerline for UWB communication

    Publication Year: 2008, Page(s):1 - 5
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (4909 KB)

    This paper presents the study of the UWB (ultra wideband) transmission characteristics over household powerline in a very high frequency band, from 50 MHz to 800 MHz. The characteristics of a type of commonly used powerline, 2.5 mm flat twin earth cable is examined for its use in UWB communication in both software simulation and measurements. Transmission of a UWB pulse over powerline is modelled ... View full abstract»

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  • Weighted cooperative sensing for pulse radar signals

    Publication Year: 2008, Page(s):1 - 5
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (283 KB)

    In this paper, the sensing performance implemented by a secondary cognitive system on a primary system (pulsed radar) is investigated. Firstly, the sensing performance considering the detection probability and the false alarm probability is presented analytically in a local single node for energy detection. Secondly, the sensing performance of a standard cooperative sensing algorithm is presented.... View full abstract»

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