Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 47, Issue 5, 3 March 2011
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Volume 47, Issue 5
3 March 2011
In Brief
- Source: Electronics Letters, Volume 47, Issue 5, page: 292 –292
- DOI: 10.1049/el.2011.9017
- Type: Article
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- Author(s): Piero Angeletti and Toso Giovanni
- Source: Electronics Letters, Volume 47, Issue 5, page: 292 –292
- DOI: 10.1049/el.2011.9018
- Type: Article
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Dr Piero Angeletti and Dr Giovanni Toso are technical staff of the European Space Agency (ESA), and are based at the largest of the ESA's sites, the European Space Research and Technology Centre (ESTEC) in The Netherlands. Here they tell us more about their research and their Letter ‘Synthesis of circular and elliptical sparse arrays’ on page 304. - Author(s): H. Dyball
- Source: Electronics Letters, Volume 47, Issue 5, page: 293 –293
- DOI: 10.1049/el.2011.9019
- Type: Article
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Researchers in Spain have demonstrated an electronic microcontroller-based system that can record and store Intracranial Pressure (ICP) data. Their datalogger, which has been successfully tested in clinical trials, uses processing tools and artificial intelligence to help physicians with the diagnosis of diseases associated with alteration of qualitative or quantitative features of intracranial pressure. - Author(s): H. Dyball
- Source: Electronics Letters, Volume 47, Issue 5, page: 294 –294
- DOI: 10.1049/el.2011.9020
- Type: Article
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The first fully micromachined, silicon-based substrate integrated waveguide (SIW) structure for millimetre-wave applications has been demonstrated by researchers from Chung-Ang University in Korea. “We believe that the proposed SIW structure can provide a very useful, versatile platform for millimetre-wave tunable SIW-based circuits,” said Professor Chang-Wook Baek who has led this project. “Since the process is based on the micromachining technique, it is completely compatible with silicon technology and can be easily integrated with MEMS devices using a relatively simple process.”
Interview
Feeling the pressure
Simple silicon SIWs
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- Author(s): F. Melandsø and S. Jacobsen
- Source: Electronics Letters, Volume 47, Issue 5, p. 297 –298
- DOI: 10.1049/el.2010.3549
- Type: Article
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A digital cancellation network is proposed to improve wide band ultrasonic scanning of targets very close to the transducer surface. The presented network, designed to reduce the capacitive current during transmission according to a predescribed model, is investigated experimentally in a pulse-echo test bed. By using both two and four parametric models on a polyvinylidene fluorid sensing element, it is shown that the received main bang can be suppressed with as much as by 32.7 and 49.2 dB, respectively, without distorting the shape of the ultrasonic UWB pulse significantly.
Improved ultrasonic near-field scanning using dual-channel digital cancellation network
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- Author(s): J. Zhang ; W. Wu ; D.-G. Fang
- Source: Electronics Letters, Volume 47, Issue 5, p. 298 –300
- DOI: 10.1049/el.2010.3646
- Type: Article
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Presented is a multi-beam antenna which can realise 360° switching scanning in azimuth. The antenna system is composed of a homogeneous ellipsoidal lens and a planar circular tapered slot antenna (TSA) array. Each TSA element is fed with a rectangular waveguide by a special waveguide-to-TSA transition. Beam scanning can be achieved by switching between the waveguide feeders. A Ku-band Teflon ellipsoidal lens fed with 20 Fermi-TSAs has been fabricated. Measurements show that the sidelobe levels of the 20 beams are all below −17 dB and the gain differences are all within ±0.4 dB. - Author(s): C. Niamien ; S. Collardey ; A. Sharaiha ; K. Mahdjoubi
- Source: Electronics Letters, Volume 47, Issue 5, p. 300 –301
- DOI: 10.1049/el.2010.3694
- Type: Article
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A new way of designing an efficient and very small antenna is presented. The proposed antenna, with a size of λ0/41, combines meander lines and a magneto-dielectric material having high refractive index and relatively low losses. The antenna gain measured (more than −5 dBi) is sufficiently high for TV signal reception in the lowest UHF band around 470 MHz. - Author(s): K.-B. Kim ; H.-K. Ryu ; J.-M. Woo
- Source: Electronics Letters, Volume 47, Issue 5, p. 301 –303
- DOI: 10.1049/el.2010.3258
- Type: Article
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A wideband folded monopole antenna coupled with a parasitic inverted-L element for 2.3–10.6 GHz band laptop computer applications is presented. The designed antenna is composed of a printed folded monopole with an asymmetrical line width and a parasitic inverted-L element. The input impedance is matched by widening the line width of the folded monopole and adjusting the space between the parasitic inverted-L element and the folded monopole. The measured −10 dB bandwidth is 4.85:1 (2.27–11 GHz), and the size of the antenna is 13.75 (1λ/10) mm×12 (1λ/11) mm (where λ=2.27 GHz). - Author(s): K. Kota and L. Shafai
- Source: Electronics Letters, Volume 47, Issue 5, p. 303 –304
- DOI: 10.1049/el.2010.7579
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Balanced antipodal Vivaldi antennas normally suffer from tilted beams and low axial gains. A simple technique, based on the substrate end shaping, is used to correct both problems. Consequently, the resulting antennas provide high axial gains, within a wide frequency band. Their performance is compared with the conventional Vivaldi antenna, and the improvements are discussed. - Author(s): P. Angeletti and G. Toso
- Source: Electronics Letters, Volume 47, Issue 5, p. 304 –305
- DOI: 10.1049/el.2010.3292
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A simple deterministic synthesis method for the design of aperiodic planar arrays with elements arranged on circular or elliptical rings is presented. Differing from other techniques presented in the literature, both the number of elements per ring, as well as the rings' spacing, are synthesised adopting only a deterministic procedure. This permits the best agreement, in terms of least mean square error, with respect to a circularly (or elliptically) symmetric reference pattern.
360° scanning multi-beam antenna based on homogeneous ellipsoidal lens fed by circular array
Ultra-miniature UHF antenna using magneto-dielectric material
Compact wideband folded monopole antenna coupled with parasitic inverted-L element for laptop computer applications
Gain and radiation pattern enhancement of balanced antipodal Vivaldi antenna
Synthesis of circular and elliptical sparse arrays
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- Author(s): S. Barati and A.M. Sodagar
- Source: Electronics Letters, Volume 47, Issue 5, p. 306 –307
- DOI: 10.1049/el.2010.3040
- Type: Article
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A circuit for automatic detection of action potentials (spikes) in neural recording devices is presented. This circuit, designed to operate in discrete time, provides an analogue threshold level based on standard deviation of the analogue samples of the input neural signal. Functionality of the circuit was tested for normal prerecorded neural signals as the input. To examine whether the spike detection threshold level tracks low-frequency baseline variations (e.g. local field potentials), the input neural signal was superposed on both a step function and a low-frequency sine wave. Designed in a 0.18 um CMOS technology, according to simulations the circuit consumes 47 µW from a ±0.9 V supply. A prototype version of the circuit was implemented and successfully tested. - Author(s): J.P. Oria ; L. Alonso ; L. Santamaria ; R. Martin ; A. Vázquez ; F. Viadero
- Source: Electronics Letters, Volume 47, Issue 5, p. 307 –309
- DOI: 10.1049/el.2010.3285
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An autonomous, portable and easy-to-handle system for recording and analysing intracranial pressure is presented, which also includes software tools to aid clinical diagnosis. The system has been validated with a significant number of clinical trials demonstrating 100% agreement between the automated diagnosis and the diagnosis of medical specialists. - Author(s): K. Zhang and J.U. Kang
- Source: Electronics Letters, Volume 47, Issue 5, p. 309 –310
- DOI: 10.1049/el.2011.0065
- Type: Article
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Numerical dispersion compensation for both standard and full-range Fourier-domain optical coherence tomography (FD-OCT) on the graphics processing unit (GPU) architecture has been implemented. The data acquisition, processing and image display were performed on a multi-thread, CPU-GPU heterogeneous computing system. The real-time ultra-high-resolution full-range complex-conjugate-free FD-OCT imaging was demonstrated at 68.4 frame/s with a frame size of 1024 (lateral) by 2048 (axial) pixels.
Discrete-time automatic spike detection circuit for neural recording implants
Portable datalogger for intracranial pressure monitoring and intelligent diagnosis
Real-time numerical dispersion compensation using graphics processing unit for Fourier-domain optical coherence tomography
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- Author(s): F. Sarica and A. Morgul
- Source: Electronics Letters, Volume 47, Issue 5, p. 310 –312
- DOI: 10.1049/el.2010.2358
- Type: Article
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Although it promises many advantages, such as simpler circuits, fewer interconnections, small chip area, etc., unfortunately multilevel logic circuits have not received sufficient attention, because there is not sufficient hardware available. In particular, it is very difficult to find circuits to implement the multilevel sequential circuits. Presented is a new flip-flop circuit which is the basic building block of multilevel sequential circuits. It is shown that basic sequential circuits such as multilevel counter/dividers may be built using this circuit. - Author(s): S.H. Yang ; K.S. Lee ; S. Kim ; Y.M. Lee
- Source: Electronics Letters, Volume 47, Issue 5, p. 312 –313
- DOI: 10.1049/el.2011.0032
- Type: Article
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An 8-bit charge-redistribution DAC with double bit processing in a single capacitor is proposed. The proposed DAC requires only four binary weighted capacitors where each capacitor converts 2-bit digital data into an analogue value in a single conversion step. Therefore, capacitor area can be effectively reduced without affecting the conversion time. The proposed 8-bit DAC is fabricated using CMOS 0.18 µm technology with a core area of 0.0934 mm2. - Author(s): J. Ryu ; Y. Joo ; S. Park ; H. Shin ; K.G. Shin
- Source: Electronics Letters, Volume 47, Issue 5, p. 313 –315
- DOI: 10.1049/el.2011.0042
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Using an optimised application prefetcher to accelerate the application launch on solid-state drives (SSDs) by exploiting the SSD parallelism is proposed. The proposed prefetcher was implemented on the Linux OS and achieved a 37% reduction of prefetcher execution time, which corresponds to an 18% reduction of application launch time. - Author(s): H. Yoshizawa ; T. Yabe ; G.C. Temes
- Source: Electronics Letters, Volume 47, Issue 5, p. 315 –316
- DOI: 10.1049/el.2010.3342
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A high-precision switched-capacitor integrator using a low-gain opamp is proposed. The circuit contains a main signal path and a predictive signal path which makes the correlated double sampling more effective. The proposed integrator was simulated using SPICE parameters for a 180 nm CMOS process with a supply voltage of 1.2 V. The circuit exhibited much lower harmonic distortion than those described in earlier works. - Author(s): J.-H. Rhu ; J.-H. Sun ; K. Kim ; H. Cho ; J.K. Park
- Source: Electronics Letters, Volume 47, Issue 5, p. 316 –317
- DOI: 10.1049/el.2010.7980
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Considering video conferencing applications, presented is the first utility accrual (or UA) real-time scheduling algorithm for multiple (m, k)-firm deadline-constrained streams running on multiprocessors, called the global multiprocessor utility accrual scheduling algorithm for (m, k)-firm deadline-constraint multimedia streams (or gMUA-MK). Analytical and experimental studies show that gMUA-MK achieves timeliness performance and relatively high quality of multimedia services compared to existing schemes including gMUA.
AB flip-flop, a first step to multilevel sequential logic
Charge-redistribution DAC with double bit processing in single capacitor
Exploiting SSD parallelism to accelerate application launch on SSDs
High-precision switched-capacitor integrator using low-gain opamp
Utility accrual real-time scheduling for (m,k)-firm deadline-constrained streams on multiprocessors
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- Author(s): T.T. Zygiridis
- Source: Electronics Letters, Volume 47, Issue 5, p. 317 –319
- DOI: 10.1049/el.2010.3729
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The correct choice of time-step size is of crucial importance in the case of the (2, 4) finite-difference time-domain (FDTD) method, as it affects the algorithm's overall accuracy and convergence rate. A description of the inherent discretisation error is introduced, which is exploited for the derivation of a simple, yet reliable, approximation of the optimum temporal sampling density. As the proposed approach attempts to remedy inaccuracies in a mean-value sense, it is shown that highly efficient calculations can be carried out in this way.
Optimum time-step size for 2D (2, 4) FDTD method
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- Author(s): W.-N. Lie ; C.-Y. Chen ; W.-C. Chen
- Source: Electronics Letters, Volume 47, Issue 5, p. 319 –321
- DOI: 10.1049/el.2010.2912
- Type: Article
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Depth maps play an important role in 3DTV applications for rendering stereo views. Most existing automatic algorithms cannot generate an acceptable quality of depth maps from a mono-channel video sequence. Proposed is a key-frame depth propagation algorithm, combining trilateral filtering to produce high-quality depth sequences. Experiment results show that the algorithm outperforms a well-known prior work in terms of depth PSNR by up to 3.5 dB. - Author(s): D.T. Nguyen ; W. Li ; P.O. Ogunbona
- Source: Electronics Letters, Volume 47, Issue 5, p. 321 –322
- DOI: 10.1049/el.2010.3256
- Type: Article
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A novel local intensity distribution (LID) descriptor for object detection is proposed. By capturing the distribution of local intensity differences effectively, the LID descriptor is insensitive to illumination changes while being more compact and discriminative compared with the popular local binary pattern. Two LID descriptors can be efficiently compared using the Kullback-Leibler distance. The efficacy and efficiency of the proposed descriptor have been verified in the task of detecting humans from static images. - Author(s): U. Yang and K. Sohn
- Source: Electronics Letters, Volume 47, Issue 5, p. 322 –324
- DOI: 10.1049/el.2010.3413
- Type: Article
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Owing to the colour variations resulting from illumination changes, many colour-based digital image processing techniques have yet to demonstrate stable performance. Proposed is an image-based colour-temperature estimation method considering camera characteristics for colour constancy. The performance of the proposed method has been validated through experiments.
2D to 3D video conversion with key-frame depth propagation and trilateral filtering
Local intensity distribution descriptor for object detection
Image-based colour temperature estimation for colour constancy
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- Author(s): H. Chu ; Y.X. Guo ; X.Q. Shi
- Source: Electronics Letters, Volume 47, Issue 5, p. 324 –326
- DOI: 10.1049/el.2010.7089
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A novel 60 GHz three-dimensional (3D) cavity bandpass filter using low-temperature co-fired ceramic technology is presented. The proposed filter shows two finite transmission zeros with each at either side of the passband using the extracted-pole and cross-coupling techniques. Both simulated and experimental results of the filter are described. - Author(s): H.-W. Deng ; Y.-J. Zhao ; X.-S. Zhang ; W. Chen ; J.-K. Wang
- Source: Electronics Letters, Volume 47, Issue 5, p. 326 –327
- DOI: 10.1049/el.2011.0054
- Type: Article
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A novel dual-band dual-mode microstrip bandpass filter (BPF) with compact size and high selectivity performance is proposed using a single short-stub-loaded stepped-impedance resonator (SIR). Owing to the source–load coupling and the intrinsic characteristics of the SIR, five transmission zeros can be generated near the passband edges and in the upper-stopband to improve the selectivity. A dual-band filter located at 1.57 GHz (GPS application) and 5.35 GHz (WLAN application) has been designed, fabricated and measured. Good agreement between simulation and measurement verifies the validity of this design methodology. - Author(s): X.J. Zhang ; H.H. Zhang ; X.P. Ma
- Source: Electronics Letters, Volume 47, Issue 5, p. 327 –328
- DOI: 10.1049/el.2010.3639
- Type: Article
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A compact wideband bandpass filter with a pentagonal-shaped open-loop folded step-impedance-resonator (SIR) using low temperature co-fired ceramic (LTCC) technology has been designed and fabricated. The filter is composed of three pentagonal-shaped open-loop SIRs embedded in multilayer thin ceramic to produce a compact size. The proposed topology is demonstrated with a design operating at 4.3 GHz with 44.2% bandwidth. More than 20 dB of spurious suppression from 6 to 11 GHz is demonstrated in the experimental results. - Author(s): I.-J. Hyeon ; W.-Y. Park ; S. Lim ; C.-W. Baek
- Source: Electronics Letters, Volume 47, Issue 5, p. 328 –330
- DOI: 10.1049/el.2011.0064
- Type: Article
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A fully micromachined, silicon-compatible substrate integrated waveguide (SIW) structure for millimetre-wave applications is proposed and demonstrated. The proposed SIW adopts benzocyclobutene polymer filled into the silicon trench as a dielectric material of the waveguide, and via structures required for the SIW are realised by deep-etched silicon columns coated with a thin metal layer. By using these fabrication techniques, the proposed structure allows integration of the SIW with silicon-based circuits or RF MEMS devices with simple batch processes, while keeping low-loss properties of the waveguide. The fabricated SIW exhibits a low insertion loss lower than 1.4 dB at a frequency range from 25 to 40 GHz. - Author(s): Z. Gong ; W. Yu ; X. Yang
- Source: Electronics Letters, Volume 47, Issue 5, p. 330 –331
- DOI: 10.1049/el.2010.3669
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Presented is an improved version of the spectral Prony's method to calculate S-parameters for microstrip circuits and antennas. It is shown that the results obtained behave better than those derived by the original spectral Prony's method, especially at low frequencies, and that they are in good agreement with the measurements.
60 GHz LTCC 3D cavity bandpass filter with two finite transmission zeros
Compact and high selectivity dual-band dual-mode microstrip BPF with single stepped-impedance resonator
Design of compact wideband LTCC filter using pentagonal-shaped SIR
Fully micromachined, silicon-compatible substrate integrated waveguide for millimetre-wave applications
Improvements to spectral domain Prony's method for analysing microstrip circuits
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- Author(s): C. Bohémond ; A. Sharaiha ; T. Rampone ; H. Khaleghi
- Source: Electronics Letters, Volume 47, Issue 5, p. 331 –333
- DOI: 10.1049/el.2010.3613
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Presented is an electro-optical radiofrequency mixer based on a semiconductor optical amplifier directly modulated by an electrical local oscillator in the presence of an optical RF signal. A good conversion gain of about 5.7 dB and a low error vector magnitude below 3.8% were obtained for this mixer, proving its ability to achieve a frequency downconversion from 2.4 GHz to 100 MHz for an optical complex-modulated RF signal: QPSK, 16QAM and 64QAM.
Electro-optical radiofrequency mixer based on semiconductor optical amplifier
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- Author(s): L. Ma ; P. Ghelfi ; M. Yao ; F. Berizzi ; A. Bogoni
- Source: Electronics Letters, Volume 47, Issue 5, p. 333 –335
- DOI: 10.1049/el.2010.2950
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An experimental demonstration of an optical parallelisation scheme for a high-sampling-rate photonic-assisted analogue-to-digital converter (ADC) is presented. By exploiting four-wave mixing in high nonlinear fibre, a tenfold parallelisation of a 9.952GS/s signal is realised with signal-to-noise ratio ranging from 24.94 to 27.53 dB, corresponding to effective number of bits (ENOB) from 3.86 to 4.26 bits. Capability for ENOB of 6 bits is also permitted, and potentials for parallelisation of larger scale are also discussed. - Author(s): S. Tanaka ; Y. Zhao ; I. Koslow ; C.-C. Pan ; H.-T. Chen ; J. Sonoda ; S.P. DenBaars ; S. Nakamura
- Source: Electronics Letters, Volume 47, Issue 5, p. 335 –336
- DOI: 10.1049/el.2010.3306
- Type: Article
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The droop property of blue GaN light emitting diodes (LEDs) has been improved by creating a 9 quantum well (QW) LED on a patterned sapphire substrate (PSS). The droop ratio was improved from 45.9 to 7.6%. At a wavelength of 447 nm, and with standard on-header packaging, the 9QW PSS-LED had an output power of 27.6 mW and an EQE of 49.7% at a current of 20 mA. The output power of the 9QW PSS-LED remains linear with increasing drive current, even up to relatively high current density, and the EQE is almost constant. - Author(s): B. Dai ; Z. Gao ; X. Wang ; N. Kataoka ; N. Wada
- Source: Electronics Letters, Volume 47, Issue 5, p. 336 –338
- DOI: 10.1049/el.2011.0203
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The generation of 10 GHz triangular, sawtooth, flat-top, sinusoidal and doublet waveforms based on the generation and manipulation of the frequency comb from a continuous-wave laser source by a single-stage dual-drive Mach-Zehnder modulator is experimentally demonstrated.
Demonstration of optical sample parallelisation for high-speed photonic assisted ADCs
Droop improvement in high current range on PSS-LEDs
Versatile waveform generation using single-stage dual-drive Mach-Zehnder modulator
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- Author(s): H.L. Wan and L.C. Jiao
- Source: Electronics Letters, Volume 47, Issue 5, p. 338 –339
- DOI: 10.1049/el.2010.2596
- Type: Article
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Most of the change detection techniques for SAR images based on the analysis of the difference image always generate the result map at the pixel level, which leads to a noisy change detection map, with holes in connected components and jagged boundaries. To attack this problem, a novel technique to generate the result at the region level is proposed, which considers each connected region as an agent and then gives the optimal label combination for all agents through the clone selection algorithm and a new fitness function. The region oriented method can avoid the above problem and improve the change detection performance. Experimental results on the real Radarsat SAR dataset validate the effectiveness of the method on both the quantitative and subjective aspects. - Author(s): N. Yang ; C. Caloz ; K. Wu
- Source: Electronics Letters, Volume 47, Issue 5, p. 339 –340
- DOI: 10.1049/el.2010.3523
- Type: Article
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A novel super-broadband planar monopulse comparator is presented, and demonstrated experimentally. This comparator is based on a recently discovered 180° hybrid coupler derived from the conventional Wilkinson divider. Because of its symmetric configuration, the proposed comparator exhibits frequency-independent nulls at its three difference output ports and therefore features a quasi unlimited bandwidth. This property substantially enhances the overall broadband resolution performance of monopulse comparators with direct benefits in tracking radar applications. - Author(s): J. Zou ; K. Gao ; E. Zhang
- Source: Electronics Letters, Volume 47, Issue 5, p. 340 –342
- DOI: 10.1049/el.2010.3576
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A new method using radar echo to confront anti-radiation missiles (ARMs) is presented. Phase difference is obtained through radar echo by using the ‘2 loop phase difference measurement’ algorithm. Coherent decoys are generated by phase difference obtained for confronting ARMs. The predicted results are presented to verify the effectiveness of this method.
Change detection in SAR images by means of grouping connected regions using clone selection algorithm
Monopulse comparator with frequency-independent delta-channel nulls for high-resolution tracking radar
Using radar echo to confront anti-radiation missiles
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- Author(s): A. Baharin ; R.S. Pinto ; U.K. Mishra ; B.D. Nener ; G. Parish
- Source: Electronics Letters, Volume 47, Issue 5, p. 342 –343
- DOI: 10.1049/el.2010.3052
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Reported is an investigation into the effect of very low plasma power on the electrical characteristics of ohmic contacts to etched p-GaN, by using very low radio frequency (RF) etching power and inductively coupled plasma (ICP) power. The results, assessed by current-voltage (I-V) characteristics and transfer length method analysis, indicate that the ohmic contacts to the etched material were improved significantly by the use of RF/ICP power of 20/40 W. A specific contact resistance as low as 0.035 Ωcm2 was obtained for unannealed contacts. This is the lowest value that has been reported so far for contacts to etched p-GaN without the use of regrowth techniques.
Low contact resistance to plasma-etched p-type GaN
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- Author(s): X. Liu
- Source: Electronics Letters, Volume 47, Issue 5, p. 343 –345
- DOI: 10.1049/el.2010.3742
- Type: Article
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An exact expression of the copula of bivariate Nakagami-m is derived. This expression is in terms of the incomplete gamma function and inverse incomplete gamma function, both supported by Matlab. - Author(s): J. Wang and G.E. Sobelman
- Source: Electronics Letters, Volume 47, Issue 5, p. 345 –346
- DOI: 10.1049/el.2010.3683
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A joint MIMO transceiver design is presented based on uniform channel decomposition. This closed-loop MIMO system can run at 400 MHz with a 16-QAM constellation on a Xilinx Virtex-4 FPGA, and can achieve a data throughput of up to 12.8 Gbit/s in an 8×8 MIMO configuration. - Author(s): Md. Masud Rana and J. Kim
- Source: Electronics Letters, Volume 47, Issue 5, p. 346 –348
- DOI: 10.1049/el.2010.7987
- Type: Article
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p.
346
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The variable step size (VSS) channel estimation (CE) method is proposed which updates during each iteration to minimise the sum of the squares of the prior estimation errors up to that current time point. In addition, this CE algorithm uses a phase discriminating weighting scheme such that the algorithm reduces error owing to noise as well as decision error. The proposed CE scheme is of little bit higher complexity than the VSS-LMS scheme while improving mean square error performance. - Author(s): P.H.J. Nardelli ; P. Cardieri ; M. Latva-aho
- Source: Electronics Letters, Volume 47, Issue 5, p. 348 –349
- DOI: 10.1049/el.2010.7366
- Type: Article
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348
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The trade-off involving capacity and interference in wireless networks, using the metric transmission capacity, is investigated. Particularly, it is shown that this metric appropriately captures the effects of this trade-off, and can be used to select the combination of modulation scheme/coding scheme that maximises the transmission efficiency of a wireless ad hoc network modelled as a homogeneous Poisson point process. - Author(s): I.E. Otung and S. Enoch
- Source: Electronics Letters, Volume 47, Issue 5, p. 349 –351
- DOI: 10.1049/el.2010.7367
- Type: Article
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349
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A study of the cell site diversity technique in fixed WiMAX is carried out using data collected in the United Kingdom through a dense network of rain gauges. The analysis includes both dual- and four-site scenarios and covers radio transmissions at frequencies between 10 and 50 GHz over 5 km terrestrial links. It is found that a simple dual-site configuration that connects a subscriber station to one of two base stations separated in azimuth by 180° provides an effective mitigation against intense rain, reducing required rain fade margins by up to 40%. - Author(s): L. Wang and J. Liu
- Source: Electronics Letters, Volume 47, Issue 5, p. 351 –352
- DOI: 10.1049/el.2010.3099
- Type: Article
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Partial transmit sequence (PTS) provides attractive peak-to-average power ratio (PAPR) reduction performance in OFDM or MIMO-OFDM. However, it leads to prohibitively large computational complexity. A cooperative PTS (co-PTS) is proposed. In co-PTS, alternate optimisation and spatial subblock circular permutation are employed. Simulation results show that co-PTS can reduce computational complexity dramatically and achieve better PAPR reduction performance compared to ordinary PTS.
Copula of bivariate Nakagami-m distribution
Joint MIMO transceiver design based on uniform channel decomposition
LMS based blind channel estimation of SC-FDMA systems using variable step size and phase information
Maximising transmission capacity of ad hoc networks via transmission system design
Mitigation of rain attenuation in fixed WiMAX using cell site diversity
Cooperative PTS for PAPR reduction in MIMO-OFDM
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