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Electronics Letters

Issue 25 • Date December 9 2010

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Displaying Results 1 - 25 of 46
  • In Brief

    Publication Year: 2010, Page(s): 1638
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (108 KB)

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  • A self-scan system

    Publication Year: 2010, Page(s): 1638
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (122 KB)

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  • Inside View

    Publication Year: 2010, Page(s):1639 - 1640
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (280 KB)

    The world's first antenna that mimics the hearing mechanism of insects has been unveiled by researchers at the University of Wisconsin in the US. Dr Nader Behdad tells us more. View full abstract»

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  • Interview

    Publication Year: 2010, Page(s): 1640
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (85 KB)

    Dr Benoit Charbonnier from France T??l??com talks about his research and the motivations for the development of the `Refl ective polarisation independent Mach- Zehnder modulator for FDMA/ OFDMA PON?? presented on page 1682. View full abstract»

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  • Coaxial-to-waveguide adapter generating circularly polarised wave

    Publication Year: 2010, Page(s):1643 - 1644
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (394 KB)

    A technique of generating a circularly polarised wave by reflection type is presented using a coaxial-to-waveguide adapter. The adapter consists of a polarisation twisting section and a phase-delay section for the generation of circular polarisation in the circular waveguide. The design and the implementation of the adapter demonstrate the advantage of significant size reduction and the possibilit... View full abstract»

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  • Compact printed antenna with 𝒽-shaped stub for dual-band operation

    Publication Year: 2010, Page(s):1644 - 1645
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (430 KB)

    A novel compact printed antenna design with a h-shaped stub for dual-band operation is presented. The proposed antenna is simply composed of a h-shaped stub resonator and a monopole radiator. The special asymmetry h-shaped stub extended from the ground can achieve a new resonance as well as reduced antenna size. Based on this concept, a prototype of the dual-band antenna has b... View full abstract»

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  • Experimental detection of Brillouin precursors through tap water at microwave frequencies

    Publication Year: 2010, Page(s):1645 - 1647
    Cited by:  Papers (15)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (239 KB)

    Proposed is a simple technique to analyse Brillouin precursor waveforms propagating through a dispersive medium at microwave frequencies. The technique has been successfully used in modelling these precursors through 10 cm deep normal tap water using the experimental S-parameter data collected with a vector network analyser from 100 MHz to 2.5 GHz. The proposed technique is general enough t... View full abstract»

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  • Frequency invariant power pattern synthesis for arbitrary arrays via simulated annealing

    Publication Year: 2010, Page(s):1647 - 1648
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (216 KB)

    A frequency invariant power pattern is synthesised, based on the weighted least-squares criterion. An auxiliary function is introduced to transform the nonlinear synthesis problem into a linear one. The phases of the desired pattern are calculated by the simulated annealing technique, and the weighting function is iteratively modified to achieve a desired power pattern. View full abstract»

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  • Frequency reconfigurable log periodic patch array

    Publication Year: 2010, Page(s):1648 - 1650
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (308 KB)

    A novel reconfigurable low profile log periodic patch array is presented. The patches are fed with a modulated meander line through aperture slots. A wideband mode from 7-10-GHz and three selected narrow band modes at 7.1, 8.2, and 9.4-GHz are demonstrated. The wideband to narrow band reconfiguration is realised by bridging the slot aperture, effectively deactivating the corresponding radiating el... View full abstract»

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  • Biomimetic electrically small antennas

    Publication Year: 2010, Page(s):1650 - 1651
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (187 KB)

    Many insects possess acute directional hearing capabilities and are able to localise a sound source of interest with a good degree of precision. An analogy can be drawn between the hearing mechanisms of such insects and a two-element, electrically small antenna array. Presented is a biomimetic electrically small antenna array that mimics the hearing mechanism of an insect with hyperacute direction... View full abstract»

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  • Development of portable breast self-examination device using enhanced tactile feedback

    Publication Year: 2010, Page(s):1651 - 1653
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (232 KB)

    A simple tactile imaging system for detecting possible breast lumps is proposed. The breast cancer detection system (BCDS) consists of a palm-sized, portable, wireless scanning probe with a nine-force sensor array, a web camera, and a PC program to display the location and stiffness of hard breast lesions based on tactile pressure profiles. The results of performance evaluation tests using various... View full abstract»

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  • Dynamic frequency tracking and phase error compensation clock de-skew buffer

    Publication Year: 2010, Page(s):1653 - 1655
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (477 KB)

    Proposed is a dynamic frequency tracking and phase error compensation clock de-skew buffer (CDSB) to reduce the clock skew between the input and output clocks of a chip. The proposed CDSB tracks the dynamic frequency in two clock cycles. Also, the CDSB utilises a fine tune circuit which is based on a cyclic rotation algorithm to compensate for the dynamic phase error. Measured results show that th... View full abstract»

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  • Continuous time ΣΔ modulator based on digital delay loop and time quantisation

    Publication Year: 2010, Page(s):1655 - 1656
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (184 KB)

    A new sigma delta (ΣΔ) modulator suitable for ultra-low power data converters is introduced. The proposed architecture is based on time encoding and quantisation using voltage controlled delays such as digital inverters. The delays together with a phase comparator implement a synchronous pulse width modulator (PWM) and a discrete time integrator. An additional analogue integrator pro... View full abstract»

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  • Data reduction method of sine look-up tables in microprocessor's memory storage

    Publication Year: 2010, Page(s):1656 - 1658
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (237 KB)

    A data reduction method of sine look-up tables for low-end microprocessors which have small memory capacity and low process speed is proposed. The proposed method is composed of an encoded sine look-up table (LUT), a linear interpolation technique, and an effective decoding algorithm. The data reduction method minimises the usage of the memory capacity for the sine LUT. It can support low-end micr... View full abstract»

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  • High fill factor CMOS APS sensor with extended output range

    Publication Year: 2010, Page(s):1658 - 1659
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (198 KB)

    A new active pixel sensor (APS) circuit architecture with increased signal range is proposed. This feature contributes to improvement of the dynamic range of the imager, since it is effectively a way to increase the full well capacity, which is reduced as pixel pitch decreases. The proposed solution does not degrade the fill factor, and can be applied to most existing CMOS APS pixels. The new read... View full abstract»

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  • Integrated approach towards adaptive state-tracking job migration for maximising performance benefit

    Publication Year: 2010, Page(s):1659 - 1661
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (216 KB)

    Presented is a new state-tracking migration policy which is adaptively integrated with immediate restart and selective preemption techniques for risk-resilient job allocation in high-throughput computing environments. The proposed approach guarantees the maximum reduction of inevitable delays with relatively low migration costs. Simulation results show that the integrated migration policy averagel... View full abstract»

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  • Recursive wideband digital differentiators

    Publication Year: 2010, Page(s):1661 - 1662
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (303 KB)

    Novel designs of recursive wideband digital differentiators are presented. These designs are obtained by the optimisation of magnitude response and the analysis of pole-zero plot. The beauty of these designs is that they are only of second order and have not more than 2% relative error in magnitude responses over wideband with different phase responses, thus being suitable for real-time applicatio... View full abstract»

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  • Radiator heightens power density of piezoelectric transformers

    Publication Year: 2010, Page(s):1662 - 1663
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (241 KB)

    A new method to heighten the power density of piezoelectric transformers based on heat transfer is presented. The common grounded surface of a piezoelectric plate transformer was closely contacted to an extra smooth copper surface through which the heat can be well dissipated by an aluminium radiator. Although the contact interface may produce additional friction heat, the experimental results sho... View full abstract»

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  • Fast mode decision algorithm for spatial scalable video coding

    Publication Year: 2010, Page(s):1663 - 1665
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (124 KB)

    Multimedia applications are ubiquitous in daily life. To satisfy multiple requests equipped with different devices and bandwidths, scalable video coding has been developed. However, it is difficult to realise spatial and quality scalabilities in practice owing to the increased coding complexity brought by inter-layer prediction. A novel fast mode decision algorithm for spatial scalable video codin... View full abstract»

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  • Bias reduction for stereo triangulation

    Publication Year: 2010, Page(s):1665 - 1666
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (134 KB)

    Stereo triangulation lays at the basis of 3D scene recovery and it is used in a wide variety of areas ranging from urban modelling to robot localisation and mapping. However, triangulation produces non-Gaussian 3D estimates from Gaussian image measurements owing to its nonlinear nature. While previous work demonstrates the presence of statistical bias and how to correct the depth estimate, in this... View full abstract»

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  • Ore image thresholding using bi-neighbourhood Otsu's approach

    Publication Year: 2010, Page(s):1666 - 1668
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (223 KB)

    A new thresholding algorithm based on two neighbourhoods and Otsu's method is proposed. For each pixel, its two neighbourhoods are chosen by image and object sizes. The thresholds of neighbourhoods are optimised by Otsu's method, and then every pixel is binarised through the minimum of thresholds. Experimental results show that the proposed algorithm improves thresholding performance efficiently, ... View full abstract»

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  • Scaled zero coefficient-aware IDCT algorithm for fast video decoding

    Publication Year: 2010, Page(s):1668 - 1669
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (63 KB)

    Proposed is a scaled zero coefficient-aware fast inverse discrete cosine transform (IDCT) algorithm that substantially outperforms the existing fixed-point 8×8 IDCT standard. The concept of the fixed-point approximation with accurate dyadic terms is applied to the zero coefficient-aware IDCT algorithm, improving the computational complexity of the authors× previous work. The experime... View full abstract»

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  • Copulas of bivariate Rayleigh and log-normal distributions

    Publication Year: 2010, Page(s):1669 - 1671
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (195 KB)

    The intrinsic relations between multivariate distributions and their marginal distributions can be clearly characterised by copulas. The bivariate Rayleigh and bivariate log-normal distributions play important roles in both signal processing and digital communications. In this reported work, the formula of bivariate Rayleigh copula is improved and the formula of bivariate log-normal copula is deri... View full abstract»

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  • Higher-order multi-interval line coding

    Publication Year: 2010, Page(s):1671 - 1673
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (156 KB)

    Multi-interval line coding (MILC) is considered with higher-order signalling. A simple recursive method to calculate the maximum number of valid MILC waveforms for any order of signalling is presented. Following the introduced recursive method, attractive higher-order MILC schemes are found. Properties of 3-ary and 4-ary MILC schemes are listed. MILC schemes that can increase the data rate by 25-4... View full abstract»

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  • Selecting optimal norm and step size of generalised constant modulus algorithms under non-stationary environments

    Publication Year: 2010, Page(s):1673 - 1674
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (138 KB)

    A family of generalised constant modulus algorithms (GCMAs) based on the norm of complex variables was recently proposed. However, the optimal norm and step size of GCMAs have not been derived owing to the complexity of the proposed cost function. The steady-state mean square error (MSE) of a class of GCMAs under non-stationary environments is now given in a closed form. The optimal norm and step ... View full abstract»

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Aims & Scope

Electronics Letters is internationally renowned for its rapid communication of new developments and emerging topics across the broad and interdisciplinary field of modern electronics and electrical engineering.

Full Aims & Scope

Meet Our Editors

Editors-in-Chief

Professor Chris Toumazou
Director of the Biomedical Institute
Imperial College, London, UK

Professor Ian White
Head of Photonics Research
University of Cambridge, UK