Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 46, Issue 17, 19 August 2010
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Volume 46, Issue 17
19 August 2010
In Brief
- Source: Electronics Letters, Volume 46, Issue 17, page: 1170 –1170
- DOI: 10.1049/el.2010.9099
- Type: Article
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- Author(s): Seokhyun Yoon
- Source: Electronics Letters, Volume 46, Issue 17, page: 1170 –1170
- DOI: 10.1049/el.2010.9098
- Type: Article
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Professor Seokhyun Yoon from Dankook University in Korea talks about the research behind his Letter ‘Asymmetrically optimised poly-diagonalisation for low complexity MIMO detection’ on page 1226. - Author(s): H. Dyball
- Source: Electronics Letters, Volume 46, Issue 17, page: 1171 –1171
- DOI: 10.1049/el.2010.9096
- Type: Article
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The first integrated multistage optical switch network has been fabricated and operated at a record speed of 160 Gbit/s. A team from the COBRA Research Institute at Eindhoven University of Technology in the Netherlands integrated several semiconductor optical amplifier (SOA) gates with low-loss passive components and wiring. This is a significant step towards an efficient and scalable means to create high connectivity reconfigurable networks. “The challenge has been threefold,” said Dr Kevin Williams, one of the researchers in the COBRA team. “Defining a highly functional circuit within a small footprint required that we miniaturised a number of circuit elements. A robust process technology was developed for the underlying active–passive integration. Finally, the combination of operating a sophisticated optical 160 Gbit/s de/multiplexer in combination with a complex unpackaged chip required considerable experimental care. We are now well placed to explore the operating limits for the circuit.” - Author(s): H. Dyball
- Source: Electronics Letters, Volume 46, Issue 17, page: 1172 –1172
- DOI: 10.1049/el.2010.9097
- Type: Article
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A new widely-tunable continuous-wave singlemode laser source around 3.24 µm for the characterisation of volatile organic compounds has been demonstrated by researchers at the National Research Council of Canada (NRC). This is the first report of a singlemode type-I diode laser at this wavelength, paving the way for highly-sensitive industrial gas applications.
Interview
Making the switch to SOAs
Coming up for air
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- Author(s): T. Gertus ; P. Každailis ; R. Rimeika ; D. Čiplys ; V. Smilgevičius
- Source: Electronics Letters, Volume 46, Issue 17, p. 1175 –1176
- DOI: 10.1049/el.2010.1723
- Type: Article
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The fabrication of surface acoustic wave (SAW) devices by femtosecond laser micromachining has been demonstrated. The interdigital SAW transducers of 50 µm wavelength were formed on YZ lithium niobate substrate by femtosecond pulse ablation of an aluminium layer. The two-port SAW device has insertion loss of 11 dB at 68 MHz. The S-parameter measurements revealed no degradation in substrate elastic, piezoelectric, and dielectric properties of the substrate due to laser processing.
Surface acoustic wave transducers fabricated by femtosecond laser ablation
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- Author(s): K. Kim ; S. Jeon ; H. Kim
- Source: Electronics Letters, Volume 46, Issue 17, p. 1176 –1177
- DOI: 10.1049/el.2010.1360
- Type: Article
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Proposed is an antenna design for achieving wide bandwidth using an extended ground. The poor radiation performance of a planar inverted-F antenna with branch structures was significantly improved using the proposed feeding method, in which the ground is extended under a feed line. The antenna design achieved 27% relative impedance bandwidth at 1.9 GHz. - Author(s): N.D. Trang ; D.H. Lee ; H.C. Park
- Source: Electronics Letters, Volume 46, Issue 17, p. 1177 –1179
- DOI: 10.1049/el.2010.1140
- Type: Article
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A coplanar waveguide fed monopole ultra-wideband antenna with triple subband notched characteristics and small volume (23×29×0.8 mm3) is presented. The proposed antenna yields impedance bandwidth of 3.1–10.6 GHz with return loss S11<−10 dB, except for the three subbands of 3.3–3.7 GHz for WiMAX, 5.15–5.825 GHz for WLAN and 7.25–7.75 GHz for the downlink of X-band satellite communication systems. These notched subbands are obtained by etching two simple types of slots on the radiating patch, which are L-shaped and semicircular slots. The antenna was successfully fabricated and measured, showing broadband matched impedance and nearly omnidirectional radiation pattern. - Author(s): X. Yang ; Y.Z. Yin ; W. Hu ; G. Zhao
- Source: Electronics Letters, Volume 46, Issue 17, p. 1179 –1181
- DOI: 10.1049/el.2010.1031
- Type: Article
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A novel compact printed double-folded inverted-L antenna is presented. The radiator is modified from a printed inverted-L antenna by extending and folding its radiated arm. A unidirectional radiation pattern is obtained as the radiator is mounted on a vertical printed rectangular ground. A slit etched on the ground of proper length and position is used to improve antenna directivity and suppress backward radiation. Measured results indicate that the proposed antenna has a good impedance characteristic (9% for return loss less than 10 dB), excellent front-to-back ratio and forward gain of 5.09 dBi. The antenna is applicable for long-range RFID handheld reader application. - Author(s): S.H. Choi ; T.J. Jung ; S. Lim
- Source: Electronics Letters, Volume 46, Issue 17, p. 1181 –1182
- DOI: 10.1049/el.2010.1464
- Type: Article
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A flexible antenna based on the composite right/left-handed transmission line is proposed. The flexible antenna is fabricated on liquid crystal polymer substrate with a thickness of 80 µm. The antenna operates at 2.3 GHz and its size is 38×43 mm. The return losses of the proposed antenna are almost unchanged while it is bent from −90° to +90°. - Author(s): J.-H. Lu and K.-T. Hung
- Source: Electronics Letters, Volume 46, Issue 17, p. 1182 –1183
- DOI: 10.1049/el.2010.0817
- Type: Article
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A novel design of a planar compact inverted-E tag antenna mounted on metallic objects for UHF RFID systems is proposed. By insetting the slit into the upper horizontal strip of the proposed compact tag antenna, a new resonant mode close to the fundamental mode of the inverted-E antenna is excited to enhance the operating bandwidth. The obtained impedance bandwidth across the operating band can reach about 123 MHz (13.7%) for the UHF band. Also, with directional pattern, the measured reading distance is about 2.5 m when the proposed compact tag antenna is mounted on the metallic object. - Author(s): H. Kim and C.W. Jung
- Source: Electronics Letters, Volume 46, Issue 17, p. 1183 –1185
- DOI: 10.1049/el.2010.1792
- Type: Article
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A very simple and successful design for an endfire directional tapered slot antenna with ultra-wideband characteristic using CPW to wide-slot transition is presented. By widening the slot width in the transition, ultra-wideband characteristic and directivity enhancement to the endfire direction of the antenna are obtained. To verify this characteristic, the electric field distributions in the transition are presented, and comparisons between simulated and measured results are demonstrated.
Bandwidth improvement method using extended ground
Compact printed CPW-fed monopole ultra-wideband antenna with triple subband notched characteristics
Compact printed double-folded inverted-L antenna for long-range RFID handheld reader
Flexible antenna based on composite right/left-handed transmission line
Planar inverted-E antenna for UHF RFID tag on metallic objects with bandwidth enhancement
Ultra-wideband endfire directional tapered slot antenna using CPW to wide-slot transition
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- Author(s): H.-K. Lee ; J. You ; S.-P. Cho ; S.-J. Hwang ; D.-R. Lee ; Y.-H. Kim ; K.-J. Lee
- Source: Electronics Letters, Volume 46, Issue 17, p. 1185 –1187
- DOI: 10.1049/el.2010.0532
- Type: Article
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The presented study highlights the feasibility and accuracy of novel computational methods based on a morphological filter and a least square acceleration filter to detect step events for evaluating normal and pathological gait parameters using a single accelerometer. This is the first evidence that demonstrates the feasibility and accuracy of the novel accelerometer-based system and methods in both normal and pathological populations.
Computational methods to detect step events for normal and pathological gait evaluation using accelerometer
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- Author(s): W. Li ; Y. Huang ; Z. Hong
- Source: Electronics Letters, Volume 46, Issue 17, p. 1187 –1188
- DOI: 10.1049/el.2010.8755
- Type: Article
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A 70–280 MHz fifth-order Chebyshev Gm-C lowpass filter in 0.13 µm CMOS is presented. A topological modification is proposed that can improve IIP3 for 10 dB compared to conventional Gm-C filters. Measured spurious free dynamic range (SFDR) is greater than 50 dB. The filter passband response is accurately maintained over four times frequency range by using unit Gm cell arrays and an independent Q tuning circuit. It consumes 21 mW under a supply voltage of 1.5 V and occupies an area of 0.12 mm2. - Author(s): J. Chae and G.C. Temes
- Source: Electronics Letters, Volume 46, Issue 17, p. 1188 –1190
- DOI: 10.1049/el.2010.0521
- Type: Article
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A comparator-based buffer is proposed to enhance the driving capability of high-gain amplifiers with switched-capacitor loads. A simple correction scheme using a resistor in the charging path and a correction phase reduces the overshoot of the output voltage. SPECTRE simulations verify the effectiveness of the proposed scheme. - Author(s): J.M. Algueta Miguel ; C.A. De La Cruz Blas ; A.J. López-Martín
- Source: Electronics Letters, Volume 46, Issue 17, p. 1190 –1191
- DOI: 10.1049/el.2010.1975
- Type: Article
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A novel CMOS transconductor based on transistors operating in the triode region and quasi-floating gate (QFG) techniques is proposed. The V-I conversion is performed by two triode transistors acting as a current divider and QFG transistors are employed to enforce a constant drain-source voltage, improving the linearity notably. The circuit has been fabricated and measured using a 0.5 µm CMOS technology in order to validate the QFG design. - Author(s): H.-S. Lee and S.-S. Park
- Source: Electronics Letters, Volume 46, Issue 17, p. 1191 –1193
- DOI: 10.1049/el.2010.1480
- Type: Article
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An iterative type impedance analysis method for an impedance network is presented. The whole impedance network is divided into several sub-networks and each sub-network is analysed in a form of the linear voltage-current relation. The analysed voltage-current relation is iteratively applied to obtain the whole impedance. An illustrated example is given to show that the proposed method is simple and effective to analyse the impedance of a network which has a very large number of impedance elements. - Author(s): S. Gregori
- Source: Electronics Letters, Volume 46, Issue 17, p. 1193 –1194
- DOI: 10.1049/el.2010.1059
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A simple circuit design improves the driving capability of conventional voltage doublers and, at the same time, eliminates short-circuit losses. Simulation results confirm higher conversion efficiency and extended operation.
70–280 MHz 21 mW 53 dB SFDR Gm-C filter
Comparator-based buffer with resistive error correction
CMOS triode transconductor based on quasi-floating-gate transistors
Iterative impedance analysis method on high integrated impedance network
Voltage doubler with improved driving capability and no short-circuit losses
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- Author(s): E. Lezar and D.B. Davidson
- Source: Electronics Letters, Volume 46, Issue 17, p. 1194 –1196
- DOI: 10.1049/el.2010.1680
- Type: Article
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In the method of moments (MOM) analysis of electromagnetic phenomena, the LU decomposition is often an important and costly step in the solution process. In this reported work, the acceleration of LU decomposition using graphics processing units (GPUs) has been considered. Although existing GPU methods, such as those supplied by MAGMA, provide significant speedup over CPU-only implementations, they are limited to smaller problems by the amount of device memory available. The method now presented takes a left-looking LU decomposition as a starting point and uses an out-of-core like approach to significantly increase the size of the problems that can be solved. In addition, a hybrid implementation that utilises MAGMA as part of the solution process is presented, further improving the performance of the method. For the double precision complex variant of the LU decomposition, the number of MOM degrees of freedom that can be solved using a solver based on MAGMA and a GPU device with 1GB of memory is limited to 7936. Using the presented panel-based and hybrid approaches has already permitted problems more than four times larger to be solved with significant speedup.
GPU-based LU decomposition for large method of moments problems
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- Author(s): K. Xie ; P. Wu ; S. Yang
- Source: Electronics Letters, Volume 46, Issue 17, p. 1196 –1197
- DOI: 10.1049/el.2010.1242
- Type: Article
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A parallel visualisation technique for large seismic data based on a graphics processing unit (GPU) and CPU cooperation is presented. The 3D texture mapping capability commonly available in modern GPUs is employed as a core rendering engine and advantage is taken of combinations of GPU-based parallel volume visualisation and visibility tests to accelerate the whole rendering process. Experimental results show that the method achieves real-time performance for very large seismic data (10GB) on standard PC hardware. - Author(s): S. Huang and J. Zhu
- Source: Electronics Letters, Volume 46, Issue 17, p. 1198 –1199
- DOI: 10.1049/el.2010.0833
- Type: Article
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An image restoration method for removing salt-and-pepper noise is proposed. The key point of the method is the sparsity used to reconstruct the whole image based on partial noise-free pixels. Experimental results demonstrate the better performance of the proposed method compared to the existing modified median-type filters.
GPU and CPU cooperation parallel visualisation for large seismic data
Removal of salt-and-pepper noise based on compressed sensing
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- Author(s): M.H. Lee ; Y. Guo ; J.Q. Luo
- Source: Electronics Letters, Volume 46, Issue 17, p. 1199 –1200
- DOI: 10.1049/el.2010.1403
- Type: Article
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A construction of a jacket matrix motivated by the element inverse property of the centre weighted Hadamard matrix is presented with suitably chosen characters on a finite Abelian group. The present matrix, which is an extension of the conventional jacket matrices on the Galois field, is a contribution to a problem of searching for an extended family of jacket matrices on finite Abelian group. - Author(s): D. Deschrijver ; L. Knockaert ; T. Dhaene
- Source: Electronics Letters, Volume 46, Issue 17, p. 1200 –1201
- DOI: 10.1049/el.2010.1364
- Type: Article
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A new algorithm is introduced for broadband macromodelling of passive electronic components from frequency response data. It modifies the vector fitting algorithm in such a way that the L1 norm of the approximation error is minimised, rather than the L2 norm. It is shown that this approach is more robust towards outliers in the data. - Author(s): X. Tang and B. Jiao
- Source: Electronics Letters, Volume 46, Issue 17, p. 1202 –1203
- DOI: 10.1049/el.2010.0489
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Recent researches have highlighted the impulsive nature of the aggregated network traffic, and consequently α-stable distribution models have been widely used to capture the observed impulsiveness. Presented is an analytical demonstration of aggregated network traffic converging to totally positively skewed α-stable distribution, which provides inherent mechanism explanation for the widely used α-stable distribution models. Simulations validate the accuracy of the presented theoretical analysis.
Construction of jacket matrix from characters on finite Abelian group
Improving robustness of vector fitting to outliers in data
On convergence of aggregated traffic to totally positively skewed α-stable distribution
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- Author(s): F. Zhang ; B. Yang ; E. Skafidas ; W. Shieh
- Source: Electronics Letters, Volume 46, Issue 17, p. 1203 –1205
- DOI: 10.1049/el.2010.1166
- Type: Article
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Direct conversion architectures have the advantage of no image frequencies, fewer components and lower cost. However, local oscillator (LO) leakage reduces receiver sensitivity, causes LO pulling, and is a challenging problem for direct conversion transceiver design. Proposed is a mixer using the second-order harmonic of the LO. The proposed subharmonic mixer is based on a switching common-gate structure. This mixer, built using 65 nm CMOS technology, achieves measured voltage conversion gain better than 3 dB for frequencies between 5 to 75 GHz with a current consumption of 2 mA at 1.5 V power supply. In the 57 to 66 GHz frequency band, the LO to RF port isolation is better than 38 dB and the noise figure is 14.8 dB when driven with a 30 GHz quadrature LO input. - Author(s): H.-W. Deng ; Y.-J. Zhao ; L. Zhang ; X.-S. Zhang ; W. Zhao
- Source: Electronics Letters, Volume 46, Issue 17, p. 1205 –1206
- DOI: 10.1049/el.2010.0995
- Type: Article
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A novel dual-band microwave bandpass filter (BPF) is proposed using a dual-mode stepped impedance resonator (DSIR) and a three-mode stepped impedance resonator (TSIR). Either of the SIRs can not only separately generate one passband but also control the passband performance. Owing to the intrinsic characteristics of the SIRs, each passband has a pair of transmission zeros to improve the selectivity. A dual-band filter located at 1.57 GHz (GPS application) and 2.4 GHz (WLAN application) is designed and fabricated. Good agreements are obtained between measured and simulated S-parameters. - Author(s): L. Markley and G.V. Eleftheriades
- Source: Electronics Letters, Volume 46, Issue 17, p. 1206 –1208
- DOI: 10.1049/el.2010.1797
- Type: Article
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A generalised negative-refractive-index transmission-line (G-NRI-TL) lattice topology is used to design a quad-band phase-shifting cell with half the group delay of previous G-NRI-TL cells and perfect matching at all frequencies. The all-pass lattice topology reduces dispersion at the operating frequencies for lower group delay performance. Design equations are presented that determine the lumped element values necessary to match the structure while achieving a given phase at four arbitrary frequencies. This transmission-line cell is useful for implementing passive quad-band microwave elements with enhanced bandwidth performance. - Author(s): S.H. Chun ; D.H. Jang ; J.Y. Kim ; J.H. Kim
- Source: Electronics Letters, Volume 46, Issue 17, p. 1208 –1209
- DOI: 10.1049/el.2010.1708
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A new high efficiency Doherty structure for code division multiple access 2000 1×3-FA test signal is presented. The proposed Doherty structure consists of a two-stage symmetric Doherty drive amplifier and an inverted asymmetric Doherty power amplifier. This Doherty structure can improve the efficiency characteristic and reduce the amplifier's dimensions. Also, higher-order intermodulation distortion products can be self-compensated. For demonstration of the amplifier's performance, a 74 W Doherty amplifier has been simulated and measured.
5–75 GHz common-gate subharmonic mixer in 65 nm CMOS
Dual-band BPF with DSIR and TSIR
Quad-band negative-refractive-index transmission-line unit cell with reduced group delay
Inverted asymmetric Doherty power amplifier driven by two-stage symmetric Doherty amplifier
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- Author(s): A. Albores-Mejia ; F. Gomez-Agis ; S. Zhang ; H.J.S. Dorren ; X.J.M. Leijtens ; T. de Vries ; Y.S. Oei ; M.J.R. Heck ; R. Notzel ; D.J. Robbins ; M.K. Smit ; K.A. Williams
- Source: Electronics Letters, Volume 46, Issue 17, p. 1209 –1211
- DOI: 10.1049/el.2010.1194
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A monolithic, multi-stage, photonic circuit comprising up to four cascaded, SOA-based, crossbar switches is assessed at record 160 Gbit/s serial line rates. Power penalties of only 1.2 dB signify an important route to high-speed, high-density optoelectronic integrated circuits. - Author(s): N.J. Frigo and F. Bucholtz
- Source: Electronics Letters, Volume 46, Issue 17, p. 1211 –1212
- DOI: 10.1049/el.2010.0781
- Type: Article
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The recent availability of DPSK demodulators has spurred interest in phase-modulated analogue RF photonic links, but phase shifts due to birefringence can cause transmission impairments. Presented are measurements of the polarisation-dependent phase shift in a DPSK demodulator created by the relative angle (in Stokes space) between the launch SOP and the demodulator's eigenstate. This phase shift is connected to earlier theoretical predictions, and results are compared to a vendor's specifications for three models. Since imperfect phase modulators may cause modulation of the polarisation at the signal frequency, these impairments may limit RF photonic link performance. - Author(s): J. Song and J.F. Ding
- Source: Electronics Letters, Volume 46, Issue 17, p. 1213 –1214
- DOI: 10.1049/el.2010.0871
- Type: Article
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A bidirectional triplexer based on a Bragg grating assisted multimode interference (MMI) coupler has been designed and fabricated. The MMI coupler can multiplex/demultiplex the 1310 nm wavelength (i.e. upload data) and the 1490 nm wavelength (i.e. download data). Moreover, the grating written in the waveguide of the MMI can reflect the 1550 nm wavelength (i.e. download video signals) to the other download port. Using a polarised UV ArF excimer laser irradiation, intrinsic waveguide birefringence can be compensated. Therefore, the fabricated device is polarasation insensitive. The working bandwidths of the final triplexer for 1310, 1490, and 1550 nm are about 110, 50, and 15 nm, respectively.
160 Gbit/s line-rate data routing through monolithic multi-stage optical switch circuit
Measurement of polarisation-dependent phase shift in DPSK demodulator
Polarisation-independent bidirectional triplexer using grating-assisted multimode interference coupler in silica-on-silicon platform
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- Author(s): I. McGregor and K. Elgaid
- Source: Electronics Letters, Volume 46, Issue 17, p. 1214 –1215
- DOI: 10.1049/el.2010.1357
- Type: Article
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A simple low-power comparator which uses depletion mode GaAs-FETs is described. The circuit converts sine wave inputs as low as 1 mV peak to square signals. A simple modification converts the circuit to a monostable. The monostable is shown to correct the duty cycle of an impulse from 1.6 to 50%. - Author(s): L. Li
- Source: Electronics Letters, Volume 46, Issue 17, p. 1215 –1217
- DOI: 10.1049/el.2010.1299
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A MEMS electromagnetic driven 2D platform that is used to move an optical pinhole has been designed, fabricated, and characterised. The device is powered by Lorentz forces generated from current-varying wires in a magnetic field. A silicon-on-insulator micromachining process was used for the device prototyping. The dynamic performance of the device has been characterised. Based on the MEMS moveable optical pinhole, a new one-detector imaging system is proposed. The single-detector imaging system has potential applications in the infrared and terahertz spectrums.
Low-power GaAs comparator and monostable
Two-dimensional moveable optical pinhole with applications in single-detector imaging systems
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- Author(s): I.P. Johnson ; K. Kalli ; D.J. Webb
- Source: Electronics Letters, Volume 46, Issue 17, p. 1217 –1218
- DOI: 10.1049/el.2010.1595
- Type: Article
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Reported is the fabrication and characterisation of a Bragg grating in multimode microstructured polymer optical fibre with a Bragg wavelength of 827 nm. This is the smallest Bragg wavelength reported to date for a polymer optical fibre grating, and the relatively low loss of the fibre at this wavelength considerably enhances the utility of the device compared to gratings at longer wavelengths. - Author(s): J.A. Gupta ; B.F. Ventrudo ; P. Waldron ; P.J. Barrios
- Source: Electronics Letters, Volume 46, Issue 17, p. 1218 –1220
- DOI: 10.1049/el.2010.1790
- Type: Article
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A tunable external cavity laser (ECL) near 3.24 µm was developed using semiconductor laser gain chips based on GaSb. The type-1 interband laser diodes were grown by molecular beam epitaxy using 17 nm InGaAsSb compressively-strained quantum wells with 30 nm AlInGaAsSb quinary barriers for improved hole confinement. In continuous-wave operation with a diode temperature of 10°C, the ECLs produce up to 1.8 mW of singlemode output power with a tuning range of 60 nm. The devices are tunable through the fundamental ν3 vibrational absorption features of methane gas, providing a platform for highly-sensitive detection of trace hydrocarbons. - Author(s): C. Wang ; W.S. Lee ; F. Zhang ; N.Y. Kim
- Source: Electronics Letters, Volume 46, Issue 17, p. 1220 –1221
- DOI: 10.1049/el.2010.1798
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A method for fabricating a Si-based packaging platform with a reflector and electrode-guided interconnections is proposed for the packaging component of a high-power light-emitting diode (LED) module. The reflector is fabricated by Ni/Au/Ag-electroplating which is patterned by SU-8 2075 and 4620 negative photo-resistors and the electrical interconnections are formed by Cu/Au-electroplating in the same body. The heat generated by the LED chip is dissipated directly to the Si body through the large metal-plated platform. This method is suitable for high-efficiency and low-cost LED packaging. - Author(s): F. Baronti ; A. Lazzeri ; R. Roncella ; R. Saletti ; A. Signorini ; M.A. Soto ; G. Bolognini ; F. Di Pasquale
- Source: Electronics Letters, Volume 46, Issue 17, p. 1221 –1223
- DOI: 10.1049/el.2010.1484
- Type: Article
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Presented is a novel approach for enhancing the signal-to-noise ratio (SNR) of optical fibre distributed temperature sensors. The proposed method is based on cyclic codes and it can be implemented by high-power lasers, which are required for long-range applications but are unsuitable for conventional coding techniques. The expected performance improvement, in terms of temperature resolution, sensing range and measurement time, is confirmed by simulations. - Author(s): D. Tosi ; M. Olivero ; A. Vallan ; G. Perrone
- Source: Electronics Letters, Volume 46, Issue 17, p. 1223 –1225
- DOI: 10.1049/el.2010.1827
- Type: Article
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A fast, high-resolution fibre Bragg grating sensing system for weigh-in-motion applications is presented. The interrogator uses standard telecom photonic components and employs signal processing to improve the accuracy down to 1 µɛ. The system has been applied to a speed bump, achieving an excellent reproduction of the bump structural deformations.
827 nm Bragg grating sensor in multimode microstructured polymer optical fibre
External cavity tunable type-I diode laser with continuous-wave singlemode operation at 3.24 µm
Si-based packaging platform for LED module using electroplating method
SNR enhancement of Raman-based long-range distributed temperature sensors using cyclic Simplex codes
Weigh-in-motion through fibre Bragg grating optical sensors
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- Author(s): I. Millán ; J.M. Burdío ; J. Acero ; O. Lucía ; D. Palacios
- Source: Electronics Letters, Volume 46, Issue 17, p. 1225 –1226
- DOI: 10.1049/el.2010.1197
- Type: Article
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Nowadays users of domestic induction cookers demand heating areas larger than traditional ones because they are able to heat larger pan diameters. These heating areas consist of several concentric planar windings which have to be fed. A possible solution is to replace the traditional single-output inverter topologies by multiple-output inverter topologies. Proposed is a topology for three concentric planar windings based on an electronic board of a domestic cooker and an adaptation board. The different configurations according to the pan diameter are detailed and some experimental results are presented. The proposed topology minimises the semiconductor stress of the devices.
Resonant inverter topologies for three concentric planar windings applied to domestic induction heating
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- Author(s): S. Yoon
- Source: Electronics Letters, Volume 46, Issue 17, p. 1226 –1228
- DOI: 10.1049/el.2010.1544
- Type: Article
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A low-complexity multi-input multi-output (MIMO) detector, based on asymmetric poly-diagonalisation and trellis decoding, is investigated. The proposed scheme is an improved version of the MIMO detection based on ‘channel shortening’ and trellis decoding. The channel shortening is performed asymmetrically for both forward and backward recursion. - Author(s): C.K. Kim ; J. Park ; D.Y. Suh ; B. Jeon
- Source: Electronics Letters, Volume 46, Issue 17, p. 1228 –1229
- DOI: 10.1049/el.2010.1681
- Type: Article
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Mobile-to-mobile video communications require both an encoder and a decoder to have low complexity. Distributed video coding (DVC) shifts the complexity to the decoder, resulting in a low-complexity encoder suitable for wireless transmission of videos. However, high complexity at the DVC decoder side makes it difficult for resource-constrained mobile devices to perform decoding. Proposed is a solution that is called a DVC bitstream reorganiser. This reorganiser estimates block-wise motion vectors and sends the motion information and the parity data required for decoding to the decoder which reduces the complexity associated with side information generation and repetitive channel decoding. Simulations demonstrate that the decoding speed of the proposed method is 10 to 25 times faster than before. - Author(s): T.Q. Duong ; G.C. Alexandropoulos ; T.A. Tsiftsis ; H.-J. Zepernick
- Source: Electronics Letters, Volume 46, Issue 17, p. 1229 –1231
- DOI: 10.1049/el.2010.1503
- Type: Article
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The outage probability (OP) of multiple-input multiple-output (MIMO) amplify-and-forward (AF) relay networks using orthogonal space-time block code is investigated. In particular, a closed-form tight lower bound expression for the OP over independently but not necessarily identically distributed Nakagami-m fading channels is derived. Moreover, an asymptotic approximation for OP which reveals the coding and diversity gains is presented. The analytical expressions are validated by Monte-Carlo simulations. - Author(s): W. Xu ; J. Zhang ; P. Zhang
- Source: Electronics Letters, Volume 46, Issue 17, p. 1231 –1232
- DOI: 10.1049/el.2010.1555
- Type: Article
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The performance of a dual-hop amplify-and-forward relay system, which experiences mixed Nakagami-m and Rician fading channels, is investigated. Based on the closed-form cumulative probability density function of the equivalent end-to-end signal-to-noise ratio, the exact expressions for outage probability and average symbol error probability are derived. The theoretical observations are verified by the Monte Carlo simulation results. - Author(s): S. Sand ; C. Mensing ; R. Raulefs ; R. Tanbourgi
- Source: Electronics Letters, Volume 46, Issue 17, p. 1232 –1234
- DOI: 10.1049/el.2010.0824
- Type: Article
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Capacity limits of position aware adaptive mobile communication systems exploiting channel state information (CSI) at the transmitter (CSIT) are presented. The position aware adaptive communication systems are benchmarked against state-of-the-art adaptive modulation and coding (AMC) systems that use only feedback CSI or additionally predict CSIT. Numerical results show that position aware adaptive systems achieve large capacity gains compared to state-of-the-art AMC systems for medium to large feedback delays. - Author(s): Z. Yao ; M. Lu ; Z.M. Feng
- Source: Electronics Letters, Volume 46, Issue 17, p. 1234 –1236
- DOI: 10.1049/el.2010.1693
- Type: Article
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A modulation for global navigation satellite systems (GNSS) signals called quadrature multiplexed BOC (QMBOC), with the corresponding correlation receiver and constant envelope multiplexing schemes, is presented. Placing the narrowband BOC component and the wideband BOC component in phase quadrature, QMBOC modulation remains an MBOC spectral constraint, which eliminates the cross-term in the autocorrelation function. It provides a new modulation option for interoperable GNSS signals. - Author(s): Q. Xue and K. Song
- Source: Electronics Letters, Volume 46, Issue 17, p. 1236 –1237
- DOI: 10.1049/el.2010.1295
- Type: Article
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A novel ultra-wideband (UWB) coaxial-waveguide power divider is presented. The design approach for the presented power divider has been developed; and a four-way UWB coaxial-waveguide power divider has been designed, fabricated and measured. The measured results show good agreement with the simulated ones.
Asymmetrically optimised poly-diagonalisation for low complexity MIMO detection
DVC bitstream reorganiser for mobile devices
Outage probability of MIMO AF relay networks over Nakagami-m fading channels
Performance analysis of dual-hop amplify-and-forward relay system in mixed Nakagami-m and Rician fading channels
Position-aided mobile communications
Quadrature multiplexed BOC modulation for interoperable GNSS signals
Ultra-wideband coaxial-waveguide power divider with flat group delay response
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- Author(s): Z.Y. Zhang ; G. Fu ; S.L. Zuo ; S.X. Gong
- Source: Electronics Letters, Volume 46, Issue 17, page: 1238 –1238
- DOI: 10.1049/el.2010.9101
- Type: Article
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- Author(s): S. Lee ; H. Lee ; J.-K. Woo ; S. Kim
- Source: Electronics Letters, Volume 46, Issue 17, page: 1238 –1238
- DOI: 10.1049/el.2010.9102
- Type: Article
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- Author(s): S. Aouini and G.W. Roberts
- Source: Electronics Letters, Volume 46, Issue 17, page: 1238 –1238
- DOI: 10.1049/el.2010.9103
- Type: Article
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Erratum for ‘Wideband unidirectional patch antenna with Γ-shaped strip feed’
Erratum for ‘Low-voltage bandgap reference with output-regulated current mirror in 90 nm CMOS’
Erratum for ‘Frequency synthesis using digital-to-frequency conversion and filtering’
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