Electronics Letters
Volume 50, Issue 6, 13 March 2014
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Volume 50, Issue 6
13 March 2014
- Features
- Antennas and propagation
- Biomedical technology
- Circuits and systems
- Control engineering
- Image and vision processing and display technology
- Microwave technology
- Photonics
- Power electronics, energy conversion and sustainability
- Radar, sonar and navigation
- Signal processing
- Wireless communications
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- Source: Electronics Letters, Volume 50, Issue 6, page: 418 –418
- DOI: 10.1049/el.2014.0720
- Type: Article
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- Source: Electronics Letters, Volume 50, Issue 6, page: 418 –418
- DOI: 10.1049/el.2014.0719
- Type: Article
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- Source: Electronics Letters, Volume 50, Issue 6, page: 419 –419
- DOI: 10.1049/el.2014.0728
- Type: Article
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- Source: Electronics Letters, Volume 50, Issue 6, page: 420 –420
- DOI: 10.1049/el.2014.0714
- Type: Article
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in brief
interview
inside view
made to be worn
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- Author(s): I.G. Lee and I.P. Hong
- Source: Electronics Letters, Volume 50, Issue 6, p. 423 –424
- DOI: 10.1049/el.2014.0053
- Type: Article
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A three-dimensional frequency selective surface (3D-FSS) that provides stability for an angle of incidence and miniaturised unit cell size is presented. The proposed 3D-FSS is easy to fabricate and is implemented using via holes in a multilayer printed circuit board structure. Frequency transmission characteristics for different angles of both TE and TM polarisations are presented through simulations. The proposed structure was fabricated so as to verify the simulation results. The comparisons between the simulation and the measured results show good agreement. The results also show that the proposed 3D-FSS can provide better frequency stability for different incidence angles and polarisations as well as miniaturised unit cell size.
- Author(s): Sen Yan ; Ping Jack Soh ; Guy A.E. Vandenbosch
- Source: Electronics Letters, Volume 50, Issue 6, p. 424 –426
- DOI: 10.1049/el.2013.3529
- Type: Article
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An innovative, flexible, planar waveguide antenna operating in dual-band mode for WLAN applications is proposed. This antenna has a simple topology, is compact and is easy to manufacture fully using textiles. It involves loading by a composite right/left-handed waveguide to generate similar radiation patterns and low backward radiation in both operating bands. The latter property is extremely desirable for wearable applications as it avoids performance degradation due to dielectric coupling to the body, besides reducing possible health risks. Simulated and measured results indicate a good reflection and radiation performance agreement in both the 2.45 and the 5.4 GHz WLAN bands.
- Author(s): O.H. Karabey ; A. Mehmood ; M. Ayluctarhan ; H. Braun ; M. Letz ; R. Jakoby
- Source: Electronics Letters, Volume 50, Issue 6, p. 426 –428
- DOI: 10.1049/el.2014.0269
- Type: Article
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A phased array antenna is presented, including a 1-by-4 dielectric resonator antenna (DRA) array, liquid crystal (LC) based phase shifters, RF-feeding and biasing networks. The dielectric resonators are used as waveguide radiating elements. The RF signal coupled between the phase shifters and DRAs are guided and then radiated from the top face of the DRAs. This reduces the effects of the surface waves since the radiation is away from the ground plane. Hence, the gain losses at wide scan angles are reduced, enlarging the antenna's beam scan angle, compared to that of a conventional microstrip patch antenna array. The LC phase shifters are realised in inverted microstrip line topology, with a phase shifter figure-of-merit of 70°/dB at 10 GHz. The far-field power patterns of the antenna were measured in an anechoic chamber for different beam directions. These results confirm that the gain losses are <1.5 for a beam scanning range of ±30° for the broadside.
- Author(s): Seongmin Pyo
- Source: Electronics Letters, Volume 50, Issue 6, p. 428 –429
- DOI: 10.1049/el.2014.0252
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A new switchable perturbing method is presented for a microstrip square ring antenna with a circular-polarisation diversity. The proposed antenna consists of three identical loops at the back ground side and one diagonal dual-loop at the front patch side for obtaining switchable circular-polarisation senses with a simple DC bias circuit. By control of the states of the two pin diodes in the front-sided dual-loop, both the left-handed and the right-handed circular polarisations can be easily alternated. The implemented antenna employing the dual-loop perturbation shows a good agreement with the simulation results and symmetrical circular polarisation characteristics at the resonant frequencies.
3D frequency selective surface for stable angle of incidence
Wearable dual-band composite right/left-handed waveguide textile antenna for WLAN applications
Liquid crystal based phased array antenna with improved beam scanning capability
Switchable circularly-polarised square ring antenna controlled by dual-loaded dual-loop
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- Author(s): H. Hamouda ; P. Le Thuc ; R. Staraj ; G. Kossiavas
- Source: Electronics Letters, Volume 50, Issue 6, p. 429 –431
- DOI: 10.1049/el.2013.4081
- Type: Article
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Two different types of inverted-F antennas which can be integrated into a micro-SD (μSD) card are presented. The antennas operate in the new band from 2.4835 to 2.5 GHz dedicated to medical applications. The volume available for the antenna in the μSD card is only 11 × 3 × 1 mm3. Performance in terms of bandwidth, the radiation efficiency and the gain of the two structures is compared and discussed. The μSD card is intended to fit multiple devices with different ground plane dimensions. As an example, the influence of the μSD card position on a standard printed circuit board of 100 × 40 mm² is also studied.
Miniature antennas embedded in electronic devices with micro-SD card form factor for telemedicine applications
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- Author(s): Zhixiong Ren ; Kefeng Zhang ; Xiaofei Chen ; Zhenglin Liu
- Source: Electronics Letters, Volume 50, Issue 6, p. 431 –432
- DOI: 10.1049/el.2013.3611
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A new power combiner consisting of four quarter-circle transmission line transformers is presented for realising the full integration of CMOS power amplifiers (PAs) Full-wave electromagnetic simulation confirms the scalability with size and technology of the combiner without efficiency degeneration.
- Author(s): S. Vlassis and F. Khateb
- Source: Electronics Letters, Volume 50, Issue 6, p. 432 –434
- DOI: 10.1049/el.2013.4181
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A simple automatic tuning circuit is proposed which is suitable for controlling very large channel resistance of weak-inverted transistors operated in the linear regime. The channel resistance for 1.2 MΩ nominal value presents about ± 0.6% variation for −20–80°C temperature range, ±5% variation at process/temperature (P/T) corners and total harmonic distortion = −42 dB for differential signals. The supply voltage was V DD = 1 V and the current consumption was about 470 nA. The proposed concept and the performance were confirmed and evaluated by simulations using standard 0.35 μm CMOS process.
- Author(s): Yi Shen ; K.F. Tsang ; Wah Ching Lee ; Faan Hei Hung ; Iasonas F. Triantis ; Kai Xuan
- Source: Electronics Letters, Volume 50, Issue 6, p. 434 –436
- DOI: 10.1049/el.2014.0093
- Type: Article
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A low-phase-noise transformer-based gate-coupled quadrature voltage-controlled oscillator (TGC-QVCO) using 0.13 μm CMOS technology is presented. The TGC-QVCO consumes 7 mW at 1 V power supply with 18% frequency tuning. The measured phase noise at 1 MHz offset varies from about −122 to −119 dBc/Hz for frequency tuning from 1.34 to 1.6 GHz. The achieved figure of merit (FoM) is 179 dB and the chip area is 800 × 900 μm2.
Scalable CMOS power combiner
Automatic tuning circuit for bulk-controlled subthreshold MOS resistors
Design of low-phase-noise CMOS transformer-based gate-coupled quadrature VCO
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- Author(s): Ji-Wook Kwon and Jiwon Seo
- Source: Electronics Letters, Volume 50, Issue 6, p. 436 –438
- DOI: 10.1049/el.2014.0467
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A docking control algorithm of a non-holonomic mobile agent is proposed, which can be employed in both the stationary and the underway docking stations. To this end, a leader–follower docking formation is proposed, where the size of the formation is reduced until docking surfaces of the agent and the docking stations contact each other. Also, a feedback linearisation control law that can compensate for the input constraint is implemented to maintain the docking formation. Numerical simulations are included to show the performance of the proposed docking control algorithm.
Docking control on both stationary and moving stations based on docking formation
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- Author(s): Jie Yang ; Cong Shi ; Liyuan Liu ; Nanjian Wu
- Source: Electronics Letters, Volume 50, Issue 6, p. 438 –439
- DOI: 10.1049/el.2014.0033
- Type: Article
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A local binary pattern (LBP)-based tracking algorithm and a novel heterogeneous vision chip architecture that implements the algorithm in high speed are proposed. The algorithm is more robust than previously reported high-speed tracking algorithms. The proposed vision chip architecture adopts multiple levels of parallel processors to execute the algorithm in pixel-parallel and patch-parallel ways. Experimental results show that the proposed implementation can achieve 1000 fps robust tracking.
- Author(s): D. Gragnaniello ; G. Poggi ; C. Sansone ; L. Verdoliva
- Source: Electronics Letters, Volume 50, Issue 6, p. 439 –441
- DOI: 10.1049/el.2013.4044
- Type: Article
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The use of a wavelet-Markov local descriptor, which exploits joint dependencies among wavelet coefficients, for fingerprint liveness detection, is proposed. On the LivDet 2009 datasets, a properly trained support vector machine classifier based on this descriptor guarantees an average error below 3%, as opposed to the 8% average error of the best conventional techniques.
- Author(s): Soonwoo Choi and Soo-Ik Chae
- Source: Electronics Letters, Volume 50, Issue 6, p. 441 –442
- DOI: 10.1049/el.2013.3334
- Type: Article
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Eight models are compared for CABAC rate estimation for HEVC rate-distortion optimisation, which are derived by changing three model variables such as the interval range distribution, the MPS range model and the model of generated bits per bin. It is found that the fractional bit model provides substantially better accuracy of rate estimation than the integer model for generated bits per bin, while the interval range distribution and the model of the MPS range do not affect the estimation accuracy significantly. Moreover, it is found that for hardware implementation, using three bits for the fractional part of the estimated bit length per bin in the rate estimation table is enough to obtain reasonable accuracy of rate estimation.
- Author(s): Wei Wu and Bin Song
- Source: Electronics Letters, Volume 50, Issue 6, p. 443 –444
- DOI: 10.1049/el.2013.3981
- Type: Article
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To reduce the computation complexity of high-efficiency video coding, a just-noticeable-distortion is introduced into fast video encoding and a fast coding unit size decision algorithm is proposed. In the proposed algorithm, the spatiotemporal factors of 8 × 8 blocks are computed using the spatiotemporal just-noticeable-distortion, and then a measure is built to represent the spatiotemporal homogeneity of a coding unit, and finally the candidate coding unit sizes are predicted. Compared with the state-of-the-art fast algorithm, experimental results show that the proposed algorithm can achieve 23.60% coding time saving while maintaining a similar coding efficiency.
- Author(s): Hyuncheol Kim and Joonki Paik
- Source: Electronics Letters, Volume 50, Issue 6, p. 444 –446
- DOI: 10.1049/el.2013.2763
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A novel compressive local appearance model-based object tracking algorithm is presented to address challenging issues in object tracking. To efficiently preserve image patches of an object and reduce the dimensionality, a random projection-based feature selection method is introduced. Modelling the object's appearance using a sparse representation over a set of templates leads to an ℓ1-regularisation problem. To solve this problem, both the reconstruction error and the residual matrix are considered which play a key role in tracking an object with severe appearance variations using the modified likelihood function. Experimental results demonstrate that the proposed method outperforms existing state-of-the-art tracking methods in terms of dealing with long-term partial occlusion, deformation and rotation.
- Author(s): Seok-Bae Seo
- Source: Electronics Letters, Volume 50, Issue 6, p. 446 –447
- DOI: 10.1049/el.2013.3900
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The group mapping law was invented to improve the accuracy of the direct histogram specification; however, some peculiar results from visible channel detectors used in meteorological imaging from the communication, ocean and meteorological satellite (COMS) exhibit worse performance than the general direct histogram specification. A hybrid mapping law is proposed, which combines the group-mapping and single-mapping laws to improve accuracy. The proposed hybrid mapping law was applied to a relative compensation method for the degradation of visible channel detectors rather than the histogram specification. Comparative experiments show that the direct histogram specification results based on the hybrid-mapping law result in improved accuracy compared with other relative compensation activities for images of the Moon using visible channel detectors.
Heterogeneous vision chip and LBP-based algorithm for high-speed tracking
Wavelet-Markov local descriptor for detecting fake fingerprints
Comparison of CABAC rate estimation models for HEVC rate distortion optimisation
Just-noticeable-distortion-based fast coding unit size decision algorithm for high efficiency video coding
Object tracking using compressive local appearance model with ℓ1-regularisation
Relative compensation method for degradation of visible detectors using improved direct histogram specification
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- Author(s): Hong-wei Deng ; Yongjiu Zhao ; Ying He ; Sheng-li Jia ; Min Wang
- Source: Electronics Letters, Volume 50, Issue 6, p. 447 –449
- DOI: 10.1049/el.2013.4263
- Type: Article
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A compact dual-notched balanced ultra-wideband (UWB) bandpass filter (BPF) is designed by using the folded triple-mode slotline resonators and differential microstrip–slotline transitions. Two differential-mode transmission zeros near the passband edges are created to improve the selectivity, due to a cross-coupling between two microstrip open stubs beyond the cross-junction position as well as between the input and output. Good matching in the whole passband can be achieved by properly choosing the width of the microstrip open stubs. The inverse QWRs coupling stepped-impedance microstrip stub loaded in the 50 Ω microstrip feedlines can generate multiple transmission zeros to suppress the common-mode resonance and realise dual-notched bands in the UWB passband. Good agreement can be obtained between the measured results and simulated ones.
- Author(s): G. Valente ; G. Montisci ; S. Mariotti
- Source: Electronics Letters, Volume 50, Issue 6, p. 449 –451
- DOI: 10.1049/el.2014.0078
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A microstrip directional coupler with high directivity is proposed for microwave applications requiring a weak coupling factor. This component has been used in the L-band radio-astronomical receiver of the Sardinia radio telescope. To improve the performance of the receiver, the operating temperature is lowered to 20 K. An in-house cryostat has been manufactured to perform measurements on the directional coupler, and very good agreement with the design specification is achieved.
- Author(s): L. Wang ; M. Romanelli ; F. Van Dijk ; M. Vallet
- Source: Electronics Letters, Volume 50, Issue 6, p. 451 –452
- DOI: 10.1049/el.2014.0155
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A photonic oscillator, locked to a master RF synthesiser, was built by using a monolithic dual-wavelength DFB semiconductor laser submitted to a frequency-shifted optical feedback. A [3; 10] GHz tuning range is reported, with a phase noise level lower than −70 dBrad2/Hz at a 10 Hz offset from the carrier.
- Author(s): Young-Bae Jung
- Source: Electronics Letters, Volume 50, Issue 6, p. 452 –454
- DOI: 10.1049/el.2014.0338
- Type: Article
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A wideband 180° branchline coupler with an interdigitated coupler is presented, which is composed of symmetrical four quarter-wavelength strips and replaces a long branch of 3λ g/4 length in conventional ring hybrid couplers. Using the proposed structure, this coupler has a wideband performance of 62% at the centre frequency with compact size. Furthermore, an excellent power dividing balance of ±0.25 dB and a phase difference of ±2° between output ports are realised. The proposed coupler is easy to design and fabricate with a single dielectric substrate in a microstrip structure.
- Author(s): N.A. Sutton and D.S. Filipovic
- Source: Electronics Letters, Volume 50, Issue 6, p. 454 –456
- DOI: 10.1049/el.2013.4069
- Type: Article
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A 15–45 GHz broadside coupled rectangular coaxial line based phase shifter is demonstrated. An analysis, the design, fabrication, measurements and a sensitivity study are conducted and discussed. Amplitude and phase imbalances of <0.25 dB and <2.5°, respectively, are measured. Input port reflection coefficients < −10 dB and an insertion loss below 0.6 dB are also obtained. A conducted sensitivity study shows the small dependence of the device performance on the process variations. The presented results may pave the way for multi-octave analogue phase shifters and beamformers throughout the millimetre-wave range.
Compact dual-notched balanced UWB BPF with folded triple-mode slotline resonator
High-performance microstrip directional coupler for radio-astronomical receivers at cryogenic temperature
Photonic microwave oscillator based on monolithic DFB lasers with frequency-shifted feedback
Wideband branchline coupler using symmetrical four-strip interdigitated coupler
Wideband micromachined broadside coupled Schiffman phase shifter
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- Author(s): S. Toyoda ; J. Miyazu ; Y. Sasaki ; T. Imai ; J. Kobayashi
- Source: Electronics Letters, Volume 50, Issue 6, p. 456 –457
- DOI: 10.1049/el.2013.3920
- Type: Article
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A polarisation-independent optical beam scanner that uses electro-optic KTa1− x Nb x O3 (KTN) crystals has been demonstrated. The polarisation dependence was compensated for by using a pair of KTN beam scanners and a half-waveplate without any degradation in the performance of either KTN beam scanner. This compensation is the result of a combination of electro-optic effects consisting of Kerr effects and elasto-optic effects via the electrostrictive and elastic strains in KTN crystals.
- Author(s): Wei Wang ; Yong Cai ; Juan Hong Huang ; Wei Huang ; Haiou Li ; Xin Lin ; Ximing Zhou ; Baosun Zhang
- Source: Electronics Letters, Volume 50, Issue 6, p. 457 –459
- DOI: 10.1049/el.2013.2980
- Type: Article
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The characteristics of a high-power single-chip green light-emitting diode (LED) operating with a >40 W input power are reported. The single-chip large area LED chip, which consists of 24 stages, was fabricated by using commercial wafers with chip dimensions of 6.5 × 5 mm2. The electrical and optical characteristics of the LED were measured up to a 500 mA injection current under direct operation conditions. Optical output power and forward voltage at 500 mA were obtained to be 3 W and 83 V, respectively, which demonstrates an external quantum efficiency (EQE) of 10.4% with a 41.5 W input power.
Polarisation-independent beam scanner using electro-optic KTN crystals
Single-chip InGaN green light-emitting diodes with 3 W optical output power
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- Author(s): Jun-Young Lee ; Kwang-Min Yoo ; Byung Sang Jung ; Beom-Soek Chae ; Jeong Kyo Seo
- Source: Electronics Letters, Volume 50, Issue 6, p. 459 –461
- DOI: 10.1049/el.2013.4236
- Type: Article
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A large air-gap wireless DC/DC charger for an electric vehicle (EV) is suggested. It is controlled by pulse width modulation (PWM) with a self-resonant frequency formed by self-inductance and a resonant capacitor so that constant frequency operation can be accomplished under a large air-gap without an additional current chopper. The feasibility of the proposed method has been verified with a 6.6 kW prototype with an air-gap of 12–20 cm.
- Author(s): Nam Yoon Kim and Chang-Woo Kim
- Source: Electronics Letters, Volume 50, Issue 6, p. 461 –462
- DOI: 10.1049/el.2013.3754
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An initial channel access technology using continuous-wave signals is proposed for establishing stable initial channel access between a transmitter and multiple receivers in a dense environment of loosely coupled (LC) wireless charging pads. Through the experiment, it is confirmed that the proposed system exhibits a fast and stable channel access performance. The initial channel access time of the proposed system is a minimum of 7 ms and a maximum of 7.82 s faster than the conventional technologies with a small deviation ranging from 68.2 to 90.4 ms, even for an increase in the number of LC wireless chargers in a small area.
- Author(s): Junghoon Han ; Young Dam Kim ; Noh-Hoon Myung
- Source: Electronics Letters, Volume 50, Issue 6, p. 462 –464
- DOI: 10.1049/el.2014.0030
- Type: Article
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Wireless power transfer (WPT) systems using a coupled magnetic resonance have to overcome the frequency splitting phenomenon for a certain distance in order to achieve the best efficiency. In this reported work, a simple and effective method is demonstrated to overcome the frequency splitting for an optimal efficiency, regardless of the distance variation while maintaining the single desired operating frequency. Then, the systems do not need complicated frequency adjustment systems to track the split frequency. For the proposed method, the equivalent circuit parameters of the WPT system are extracted to overcome the frequency splitting by using the genetic algorithm (GA). Then, two adjustable capacitors are added at the source and the load with the optimal values calculated by the GA, again, at the desired operating frequency for the optimal efficiency.
Large air-gap 6.6 kW wireless EV charger with self-resonant PWM
Effective initial channel access in dense loosely coupled wireless charging pad environments
Efficient performance optimisation of wireless power transmission using genetic algorithm
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- Author(s): Zhouting Wu ; Lijia Huang ; Donghui Hu ; Chibiao Ding
- Source: Electronics Letters, Volume 50, Issue 6, p. 464 –466
- DOI: 10.1049/el.2013.3925
- Type: Article
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In geosynchronous synthetic aperture radar (GEO SAR), the azimuth FM rate drastically falls and comes close to the variation rate of the Doppler centroid, due to the higher altitude. The effect of the variation of the Doppler parameters becomes significant and affects the azimuth resolution results. A concise azimuth resolution expression is deduced from the azimuth ambiguity function which involves the azimuth variance property and third-order range equation. It is more accurate for GEO SAR than the conventional expression. Meanwhile, the phenomenon where the traditional frequency algorithm becomes invalid is found. However, the time domain algorithm is still applicable when the azimuth FM rate approaches zero. Finally, the simulation results of the point targets at five typical areas verify the analysis.
Azimuth resolution analysis in geosynchronous SAR with azimuth variance property
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- Author(s): Liming Shi ; Yun Lin ; Xianzhong Xie
- Source: Electronics Letters, Volume 50, Issue 6, p. 466 –467
- DOI: 10.1049/el.2013.3997
- Type: Article
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A method for minimising the L 1 norm relying on the convex combination of two affine projection sign algorithms is proposed. The major drawbacks of the affine projection sign type algorithms are a poor convergence rate and instability in time-variant scenarios, especially in the presence of abrupt changes. A convex combination method is used to obtain a superior performance. Instead of minimising the squared error in the conventional convex combination theory, the minimisation of the L 1 norm is introduced to offer a more robust solution in the presence of a non-Gaussian impulsive interference. The good performances in terms of the convergence rate and the steady-state error are demonstrated in a plant identification experiment that includes the impulsive noise and abrupt changes.
Combination of affine projection sign algorithms for robust adaptive filtering in non-Gaussian impulsive interference
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- Author(s): Taewook Heo ; Hyunhak Kim ; JeongGil Ko ; Yoonmee Doh ; JongJun Park ; Jongarm Jun ; Hoon Choi
- Source: Electronics Letters, Volume 50, Issue 6, p. 467 –469
- DOI: 10.1049/el.2014.0165
- Type: Article
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A novel adaptive dual-prediction scheme is introduced for minimising the data communication load for wireless sensor networks as a way to maximise the lifetime of resource-limited sensor nodes. Specifically, the proposed scheme exposes the fact that when sensing context prediction is used at both the sink node and the sensor nodes, the amount of data that need to be transmitted can be minimised. Furthermore, the transmission data quantity is reduced even more by exploiting the spatial correlation among different sensor nodes. On using this adaptive dual prediction scheme, the evaluations show that the amount of data transmissions can be compressed by as much as 20% against a basic dual prediction scheme, suggesting that the lifetime of sensor nodes can increase significantly in practical systems.
- Author(s): N. Iqbal ; A. Zerguine ; N. Al-Dhahir
- Source: Electronics Letters, Volume 50, Issue 6, p. 469 –471
- DOI: 10.1049/el.2013.4091
- Type: Article
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An adaptive frequency-domain equaliser for the single carrier frequency division multiple access (SC-FDMA) system using the particle swarm optimisation (PSO) technique is proposed. Unlike the stochastic gradient and recursive least squares algorithms, the PSO is known to have fast convergence which does not depend on the underlying structure. The cost function used in a PSO is formulated based on the respective structure of the equaliser, whether it is a linear equaliser or a decision feedback equaliser. The robustness of the proposed PSO algorithm is demonstrated on a high Doppler scenario. Furthermore, it is shown that the performance improves more when using re-randomisation. Finally, it is shown that the PSO-based frequency-domain equaliser is more computationally efficient than its time-domain counterpart.
- Author(s): Cheng Zhang ; Wangdong Qi ; Peng Liu ; Li Wei
- Source: Electronics Letters, Volume 50, Issue 6, p. 471 –473
- DOI: 10.1049/el.2013.3112
- Type: Article
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Received signal strength (RSS) ranging in multipath environments suffers from two major drawbacks: laborious training and poor accuracy. Based on the observation that frequency-squared weighted RSS is periodic with respect to carrier frequency, multipath cancellation by frequency diversity (MCFD) is proposed, which is a novel training-free approach to RSS ranging that makes RSS measurements at multiple frequencies and combines them together to cancel out the multipath effect. Simulations and experimental results in two common scenarios for ground-deployed wireless sensor networks show that MCFD outperforms traditional RSS ranging in accuracy.
- Author(s): Siming Peng ; Yuehong Shen ; Zhigang Yuan
- Source: Electronics Letters, Volume 50, Issue 6, p. 473 –475
- DOI: 10.1049/el.2013.4216
- Type: Article
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A simple nonlinear companding transform which makes full use of the statistical characteristics of the original multi-carrier signals and combining them with the simplest clipping theory is proposed to reduce the peak-to-average power ratio (PAPR) of multi-carrier systems. By making a simple truncation to the Rayleigh-distributed original signals, the proposed scheme not only has low implementation complexity but also outperforms conventional companding schemes.
- Author(s): K. Chemmangat ; F. Ferranti ; T. Dhaene ; L. Knockaert
- Source: Electronics Letters, Volume 50, Issue 6, p. 475 –476
- DOI: 10.1049/el.2014.0016
- Type: Article
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p.
475
–476
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An enhanced parametric macromodelling scheme is presented for linear high-frequency systems based on the use of multiple frequency scaling coefficients and a sequential sampling algorithm to fully automate the entire modelling process. The proposed method is applied on a ring resonator bandpass filter example and compared with another state-of-the-art macromodelling method to show its improved modelling capability and reduced setup time.
Adaptive dual prediction scheme based on sensing context similarity for wireless sensor networks
Adaptive equalisation using particle swarm optimisation for uplink SC-FDMA
Multipath cancellation by frequency diversity: a training-free and analytical approach to accurate RSS ranging in ground-deployed wireless sensor networks
PAPR reduction of multi-carrier systems with simple nonlinear companding transform
Parametric macromodelling of linear high-frequency systems using multiple frequency scaling and sequential sampling
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