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Electronics Letters

Issue 25 • Date December 8 2011

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Displaying Results 1 - 25 of 35
  • In brief

    Publication Year: 2011, Page(s): 1352
    IEEE is not the copyright holder of this material | PDF file iconPDF (96 KB)
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  • Interview

    Publication Year: 2011, Page(s): 1352
    IEEE is not the copyright holder of this material | PDF file iconPDF (90 KB)
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  • Inside view

    Publication Year: 2011, Page(s): 1353
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (231 KB)

    The equivalence of nerve membrane protein conductance and memristive circuits has been demonstrated by researchers in New Zealand. Dr S M Rezaul Hasan tells us more View full abstract»

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  • A figure of speech

    Publication Year: 2011, Page(s): 1354
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (547 KB)

    Speech recognition for smartphones and other applications could be improved thanks to a new background noise estimation technique from researchers in Korea. Gil-Jin Jang from Ulsan National Institute of Science and Technology (UNIST) and Hong-Young Cho from the Electronics and Telecommunications Research Institute (ETRI) have created a technique to improve the quality of speech recognition. By tra... View full abstract»

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  • TEM horn antenna with multi-pole band notch characteristic

    Publication Year: 2011, Page(s):1357 - 1358
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (203 KB)

    A wideband TEM horn antenna with a multi-pole band notch characteristic is reported. From measured results, it is observed that the bandwidth of the TEM horn antenna is more than 2 octaves, from 1 to 5 GHz and has a notch close to 3.5 GHz. The peak value of gain suppression, in H-plane, is more than 30 dB. The measured gain curve for the forward direction shows that the performance is the same as ... View full abstract»

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  • Wideband circularly polarised planar monopole antenna array

    Publication Year: 2011, Page(s):1358 - 1360
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (503 KB)

    A simple design for a wideband circularly polarised planar monopole antenna array is presented. The attractive characteristics of the proposed antenna array are the wide impedance bandwidth of 87.3% (1 to 2.55%GHz), the 3%dB axial ratio (AR) bandwidth of 95% (1.05 to 2.95%GHz), and the maximum gain within the 3%dB AR bandwidth of about 4%dBi. View full abstract»

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  • High resolution Hough transform based on butterfly self-similarity

    Publication Year: 2011, Page(s):1360 - 1361
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (202 KB)

    Geometrical analysis is used to show that Hough transform (HT) space accumulator arrays (butterflies) exhibit self-similar properties. A very high resolution HT is then proposed based on this property. This method reliably overcomes the peak splitting and vote spreading problems associated with traditional high resolution HTs. View full abstract»

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  • Modelling of calcium ion (Ca+2) conductance in nerve membrane protein channel as memristive circuit element

    Publication Year: 2011, Page(s):1361 - 1363
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (137 KB)

    It is proved that the variable conductance of calcium ions (Ca+2) through the nerve membrane protein channel, labelled as gCa, in the Morris-Lecar nerve membrane macro circuit model, can be further modelled as a voltage-dependent one port memristor element. In this representation of gCa as a memristor, properties of this nonlinear time invariant conductance are proven to b... View full abstract»

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  • Describing function model of series resonant inverter with current limiting diode-clamp

    Publication Year: 2011, Page(s):1363 - 1364
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (121 KB)

    An equivalent circuit model for predicting the steady-state behaviour of the series resonant inverter with a current limiting diode-clamp is derived using describing function techniques. An iterative procedure is employed to determine the conduction point of the diode-clamp. Experimental results taken from a prototype inverter are presented to validate the model. View full abstract»

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  • 2DPCA-based method for place classification using range scan

    Publication Year: 2011, Page(s):1364 - 1366
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (258 KB)

    A method for place classification from a range scan is proposed, where the range scan is characterised with a 2D histogram of pairwise angular distance. The proposed method uses two-dimensional principal component analysis (2DPCA), a feature extraction and data representation technique, to train a set of classifiers with 2D histograms of range scans. View full abstract»

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  • Analysis of sensor fingerprint for source camera identification

    Publication Year: 2011, Page(s):1366 - 1367
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (365 KB)

    In the field of digital image forensics, image source identification aims at establishing a link between an image and the device that generated it. All digital pictures taken by the same device are overlaid by a specific pattern, which is a unique and intrinsic fingerprint of the acquisition device. Such a fingerprint can be estimated as the difference between the content and its denoised version,... View full abstract»

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  • Optimal key-frame selection for video-based structure-from-motion

    Publication Year: 2011, Page(s):1367 - 1369
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (254 KB)

    Proposed is a novel key-frame selection method for the video-based structure-from-motion technique. This method consists of two main steps. First, unreliable features are eliminated by analysing the lifetimes of the tracked features. Next, an optimal set of key-frames is selected considering sufficient baselines between key-frames, data redundancy, and the avoidance of degeneracy. The proposed met... View full abstract»

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  • Spectral sensitivity estimation for EMCCD camera

    Publication Year: 2011, Page(s):1369 - 1370
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (233 KB)

    A spectral sensitivity is estimated of an electron-multiplying CCD (EMCCD) camera which is able to acquire a colour image under low-light-level conditions. The spectral sensitivity estimation of the EMCCD has never been performed for the EMCCD camera characterisation. In this reported work, to estimate spectral sensitivity, various methods are applied to the EMCCD camera, including regularised lea... View full abstract»

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  • Active tool for human activity data collection

    Publication Year: 2011, Page(s):1370 - 1372
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (239 KB)

    Sensor-based human activity data (HAD) collection, used for engineering human activity recognition (HAR) systems, is a cumbersome process. Its success depends on two factors: correct activity labels and correct sensor activation sequence. This is very hard to achieve, as is seen in many previous studies. Therefore, a system for automatically observing HAD collection is introduced, making it a lot ... View full abstract»

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  • Iterative doubly constrained robust Capon beamformer

    Publication Year: 2011, Page(s):1372 - 1373
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (215 KB)

    In the presence of pointing errors, an iterative doubly constrained robust Capon beamformer is proposed. Based on the coarse estimation of the desired signal direction mismatch factor, the approach can update the estimated desired steering vector through iterative computations with small uncertainty set, and does not need any crucial preselected parameters which are unavoidable in some existing ro... View full abstract»

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  • Joint code multipath mitigation for composite binary offset carrier modulated signals

    Publication Year: 2011, Page(s):1374 - 1375
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (192 KB)

    A new multipath mitigation algorithm for composite binary offset carrier (CBOC) signals defined for the Galileo navigation system is presented. The pilot and data channels are jointly tracked by multipath mitigation windows (MMW). The proposed algorithm is demonstrated as an implementation of the optimum s-curve shaping for CBOC multipath mitigation applications. View full abstract»

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  • Y-junction power divider based on substrate integrated waveguide

    Publication Year: 2011, Page(s):1375 - 1376
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (201 KB)

    The substrate integrated waveguide (SIW) plays a very important role in millimetre-wave and microwave integrated circuits and systems with low return loss and high Q-factor. Also, the half-mode substrate integrated waveguide (HMSIW) has been developed in recent years. A new Y-junction four-way power divider is proposed by integrating the 90° Y-junction SIW power divider and HMSIW power divi... View full abstract»

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  • Compact dual-band bandpass filter with good frequency selectivity

    Publication Year: 2011, Page(s):1376 - 1377
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (200 KB)

    A compact microstrip dual-band bandpass filter with controllable bandwidth for each passband and good frequency selectivity is proposed. The proposed dual-band bandpass filter has five transmission zeros. The transmission zeros are generated by each dual-mode resonator and input/output port cross-coupling. The dual-band bandpass filter application is designed for 2.4/5.2 GHz WLAN. Experimental mea... View full abstract»

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  • Development of wideband low-loss directional coupler with suspended stripline and microstrip line

    Publication Year: 2011, Page(s):1377 - 1379
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (429 KB)

    A novel K/Ka band directional coupler with low insertion loss over a wideband is proposed. The design combines the advantages of suspended stripline (SS) and microstrip line (MS). This novel directional coupler is suitable for high output power detection and can be seamlessly integrated with low-loss SS power combiners and MS circuits. The measured insertion loss is less than 0.2 dB, coupling is w... View full abstract»

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  • High selectivity UWB bandpass filter using dual-mode resonators

    Publication Year: 2011, Page(s):1379 - 1381
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (356 KB)

    A novel ultra-wideband bandpass filter using multilayer technology is reported. A dual-mode resonator is designed on the middle layer to generate a transmission zero at the upper stopband, and a short-circuited coupling line is designed on the top layer for generating a transmission zero at the lower stopband. These incorporated transmission zeros result in high selectivity for the proposed filter... View full abstract»

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  • Hybrid-shaped single-loop resonator: a four-band metamaterial structure

    Publication Year: 2011, Page(s):1381 - 1382
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (345 KB)

    The aim of this reported work is to demonstrate the feasibility of a miniaturised four-band metamaterial resonator which has potential use in the design of multiband microwave devices such as four-band mobile phone patch antennas. The suggested resonator topology is called the hybrid-shaped single-loop resonator (HSLR) as its unit cell is formed by the combination of square-shaped and triangular-s... View full abstract»

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  • Joint compensation model for memory power amplifier and frequency-dependent nonlinear IQ impairments

    Publication Year: 2011, Page(s):1382 - 1384
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (190 KB)

    Proposed is a new joint compensation model for memory power amplifier and frequency-dependent nonlinear IQ impairments. In comparison with the previous models, the proposed model can improve the linearisation performance of digital predistortion when frequency-dependent nonlinear IQ impairments are present. View full abstract»

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  • Individual fault location in PON using pulsed pump-probe Brillouin analysis

    Publication Year: 2011, Page(s):1384 - 1385
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (164 KB)

    A novel fault location technique for passive optical networks (PONs) that employs Brillouin gain analysis is presented. This method can measure the optical loss distribution of individual branched optical fibres without the need to add any optical components to PONs. A preliminary measurement of two-branched optical fibres in a PON is described. View full abstract»

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  • Pinched hysteretic loops of ideal memristors, memcapacitors and meminductors must be 'self-crossing'

    Publication Year: 2011, Page(s):1385 - 1387
    Cited by:  Papers (24)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (103 KB)

    Recently, novel findings have been published, according to which some mem-systems excited by harmonic signals can be characterised by the so-called `non-crossing-type pinched hysteretic loops`. Presented is a proof that this phenomenon cannot occur in ideal memristors, memcapacitors and meminductors which are defined axiomatically via the corresponding constitutive relations or via other equivalen... View full abstract»

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  • Modelocked semiconductor laser system with pulse picking for variable repetition rate

    Publication Year: 2011, Page(s):1387 - 1388
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (251 KB)

    The generation of picosecond pulses from a hybrid modelocked semiconductor master oscillator power amplifier system with a repetition rate as low as 340 kHz is presented. The fundamental repetition rate of the external cavity laser was 348 MHz and is reduced by an integrated ultrafast semiconductor pulse picker element which picks and amplifies only every 2nth pulse. The central wavelen... 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