Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 36, Issue 24, 23 November 2000
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Volume 36, Issue 24
23 November 2000
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- Author(s): Tze Kiu Lee ; Wing Shing Chan ; T.Y.M. Siu
- Source: Electronics Letters, Volume 36, Issue 24, p. 1983 –1984
- DOI: 10.1049/el:20001404
- Type: Article
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p.
1983
–1984
(2)
Front-end RF switches commonly use pin diodes as the switching element. A novel RF switch using the existing front-end power amplifier and low noise amplifier to give better performance with reduced component count and lower cost is demonstrated. - Author(s): Baoyong Chi and Bingxue Shi
- Source: Electronics Letters, Volume 36, Issue 24, p. 1984 –1985
- DOI: 10.1049/el:20001388
- Type: Article
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p.
1984
–1985
(2)
A novel self-adaptive current mode sorter is presented. It has a simple structure with a complexity of O(N) and a large dynamic range. No-biasing signal is needed. It performs well even at large input currents. HSPICE simulation shows that this sorter has high precision, high resolution and low power.
Power amplifier/low noise amplifier RF switch
Self-adaptive current mode sorter with high resolution
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- Author(s): R.V. de Jongh ; J. Martí-Canales ; L.P. Ligthart
- Source: Electronics Letters, Volume 36, Issue 24, p. 1986 –1987
- DOI: 10.1049/el:20001409
- Type: Article
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p.
1986
–1987
(2)
Radar cross-section measurements in the time domain are performed, for the very first time, over a compact range. Apart from the hardware configuration and calibration used, extended analysis capabilities are discussed and illustrated with measurements. An enormous potential is envisaged in industrial and military applications, e.g. reverse engineering, radome optimisation and stealth design. - Author(s): H. Evans ; P. Gale ; B. Aljibouri ; E.G. Lim ; E. Korolkeiwicz ; A. Sambell
- Source: Electronics Letters, Volume 36, Issue 24, p. 1987 –1988
- DOI: 10.1049/el:20001407
- Type: Article
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p.
1987
–1988
(2)
A 5.8 GHz circularly polarised 2 × 2 patch antenna array is presented, employing sequential rotation of dual-feed circularly polarised elements; appropriate phase-shifting and power splitting are achieved via a serial feed arrangement. The feed has been optimised using simulated annealing; the resulting structure has a voltage standing wave ratio 2:1 bandwidth of 9.8%. Results obtained by full wave simulation and practical measurement confirm the integrity of the design. - Author(s): M. Fernández-Pantoja ; A. Monorchio ; A. Rubio-Bretones ; R. Gómez-Martín
- Source: Electronics Letters, Volume 36, Issue 24, p. 1988 –1990
- DOI: 10.1049/el:20001400
- Type: Article
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p.
1988
–1990
(3)
An optimisation procedure based on the genetic algorithm is applied to design resistively loaded wire antennas. The broadband characteristic of the antenna is realised through a maximisation of the fidelity factor directly in the time domain. The performance characteristics of the resulting antenna are presented and contrasted with those of the Wu-King design. - Author(s): E. Lee ; P.S. Hall ; P. Gardner
- Source: Electronics Letters, Volume 36, Issue 24, p. 1990 –1991
- DOI: 10.1049/el:20001385
- Type: Article
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p.
1990
–1991
(2)
With the introduction of DCS1800 to meet the demands for a wider frequency spectrum for mobile communication systems, novel antenna structures capable of generating dual resonance are in demand. An antenna structure based on the geometry of a bent folded monopole antenna capable of dual resonance frequencies operation is discussed. This antenna is able to cover the GSM/DCS1800 communication system bands. - Author(s): P. López ; J.A. Rodríguez ; F. Ares ; E. Moreno
- Source: Electronics Letters, Volume 36, Issue 24, p. 1991 –1993
- DOI: 10.1049/el:20001428
- Type: Article
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p.
1991
–1993
(3)
The sidelobe level of a uniformly excited array can be lowered significantly by reducing the amplitudes of a minority of its elements. The authors describe a genetic algorithm method for determining which amplitudes to reduce and by how much, and illustrate the method by applying it to a 100-element linear array.
Analysis of time domain radar cross-section measurements in compact ranges
Application of simulated annealing to design of serial feed sequentially rotated 2 × 2 antenna array
Direct GA-based optimisation of resistively loaded wire antennas in the time domain
Dual band folded monopole/loop antenna for terrestrial communication system
Low sidelobe level in almost uniformly excited array
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- Author(s): Y.P. Xu ; X.B. Qian ; G. Karunasiri
- Source: Electronics Letters, Volume 36, Issue 24, p. 1993 –1994
- DOI: 10.1049/el:20001414
- Type: Article
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p.
1993
–1994
(2)
A new circuit for microbolometer bias-heating cancellation is described. The circuit is based on the equivalence between the electrical and thermal capacitance. A replica of the bias-heating effect is generated on the electrical capacitance and is used to effectively cancel the bias heating of the microbolometer. The cancellation is tunable.
Circuit for microbolometer bias-heating cancellation
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- Author(s): P. Corsonello ; S. Perri ; V. Kantabutra
- Source: Electronics Letters, Volume 36, Issue 24, p. 1994 –1995
- DOI: 10.1049/el:20001426
- Type: Article
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p.
1994
–1995
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A new VLSI 3:1 multiplexer is presented. The proposed circuit is based on a double controlled tri-state buffer. A custom cell which can easily be added to the AMS 0.6 µm CMOS standard cell library has been developed. The new cell shows a propagation delay of ~780 ps and dissipates 5.2 µW/MHz. - Author(s): Jae-Goo Lee ; Young-Hyun Jun ; Chilgee Lee ; Bai-Sun Kong
- Source: Electronics Letters, Volume 36, Issue 24, p. 1996 –1997
- DOI: 10.1049/el:20001413
- Type: Article
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p.
1996
–1997
(2)
A novel I/O divided column redundancy (IDCR) scheme that can improve the effectiveness of repair and minimise the overhead of the die area is presented. The IDCR scheme has greater flexibility than conventional schemes in multiple I/O DRAMs. Since an IDCR can share neighbouring redundant column lines (RCLs), the RCLs of neighbouring I/O blocks can be used to repair the defective column lines of a self-block. This work also shows that the IDCR scheme improves the data access speed of normal column lines or redundant column lines by reducing the data bus loading.
Design of 3:1 multiplexer standard cell
I/O divided column redundancy scheme for high-speed DRAM with multiple I/Os
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- Author(s): S. Yamashita and K. Torii
- Source: Electronics Letters, Volume 36, Issue 24, p. 1997 –1998
- DOI: 10.1049/el:20001387
- Type: Article
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p.
1997
–1998
(2)
A proposed novel technique for highly-efficient optical fibre wavelength converters based on four-wave mixing is demonstrated. Spread spectrum of pump light has been shown to be effective in suppressing stimulated Brillouin scattering, yet results in the spread of the converted spectrum. To avoid this, modulating the pump and signal lights synchronously is proposed. Cancellation of the spectral spread and the highly-efficient wavelength conversion is demonstrated experimentally. - Author(s): T.M. Monro ; Y.D. West ; D.W. Hewak ; N.G.R. Broderick ; D.J. Richardson
- Source: Electronics Letters, Volume 36, Issue 24, p. 1998 –2000
- DOI: 10.1049/el:20001394
- Type: Article
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p.
1998
–2000
(3)
The fabrication of the first non-silica holey or microstructured optical fibre is reported. The chalcogenide glass gallium lanthanum sulphide was used. Applications of such fibres include optical switching, high power-delivery, acousto-optic devices, air-guiding fibres, fibre sensors, mid-IR devices, amongst others. In addition, holey fibre technology provides an improved route towards fabricating singlemode compound glass fibres. - Author(s): K.P. Chen ; P.R. Herman ; R. Tam ; J. Zhang
- Source: Electronics Letters, Volume 36, Issue 24, p. 2000 –2001
- DOI: 10.1049/el:20001418
- Type: Article
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p.
2000
–2001
(2)
Long-period gratings were fabricated in hydrogen-loaded telecommunication fibre using 157 nm F2-laser radiation. A >20 dB attenuation peak at 1590 nm was induced with only 5.0 J/cm2 accumulated fluence, a value > 250-fold smaller in comparison with fluence requirements for 248 nm KrF-laser irradiation. - Author(s): X. Wang and K.T. Chan
- Source: Electronics Letters, Volume 36, Issue 24, p. 2001 –2003
- DOI: 10.1049/el:20001424
- Type: Article
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p.
2001
–2003
(3)
A novel tunable all-optical incoherent bipolar delay-line filter scheme is proposed. It utilises the cross-intensity modulation characteristic of an injection-locked Fabry-Perot laser and the reflection characteristic of a delay line composed of a sequence of tunable fibre Bragg gratings. Bipolar transversal filters are experimentally demonstrated and their filter performance agrees well with theoretical calculation. - Author(s): P.A. Champert ; S.V. Popov ; J.R. Taylor
- Source: Electronics Letters, Volume 36, Issue 24, p. 2003 –2004
- DOI: 10.1049/el:20001392
- Type: Article
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p.
2003
–2004
(2)
Nine Raman orders covering a 130 nm bandwidth in the visible range have been generated in an optical fibre using a visible fibre pump source based on a seeded ytterbium amplifier and second harmonic generation in periodically poled KTP. A tunable, compact, fibre-based visible source has been demonstrated.
Cancellation of spectral spread in highly-efficient optical fibre wavelength converters
Chalcogenide holey fibres
Rapid long-period grating formation in hydrogen-loaded fibre with 157 nm F2-laser radiation
Tunable all-optical incoherent bipolar delay-line filter using injection-locked Fabry-Perot laser and fibre Bragg gratings
Tunable, broad visible range, fibre-based Raman source
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- Author(s): J. Feng and K-T. Lo
- Source: Electronics Letters, Volume 36, Issue 24, p. 2005 –2006
- DOI: 10.1049/el:20001412
- Type: Article
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p.
2005
–2006
(2)
A feature-based initialisation method is developed for codebook design in vector quantisation of images. The proposed algorithm makes use of different features of the image block in training set-to-do clustering for producing the initial codebook for the LBG algorithm. It is shown that the proposed method not only speeds up the LBG process but also enhances the quality of the reproduced images. - Author(s): S.V. Voloshynovskiy ; A.R. Allen ; Z.D. Hrytskiv
- Source: Electronics Letters, Volume 36, Issue 24, p. 2006 –2007
- DOI: 10.1049/el:20001399
- Type: Article
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p.
2006
–2007
(2)
An approach to image restoration is presented which combines the properties of classical regularised iterative algorithms and M-estimation. The method is based on a penalised maximum likelihood estimation incorporating a generalised robust objective function which takes into account non-Gaussian noise and edge-preserving image priors. Results are presented which demonstrate the effectiveness of the method with low-resolution noisy images of simulated landmines. - Author(s): Ye-Kui Wang and Guo-Fang Tu
- Source: Electronics Letters, Volume 36, Issue 24, p. 2007 –2008
- DOI: 10.1049/el:20001416
- Type: Article
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p.
2007
–2008
(2)
A successive elimination algorithm for binary block matching motion estimation based on one-bit transform is presented. The principles of the proposed algorithm are mathematically formulated. Simulation results show that the proposed algorithm can significantly reduce the computation time without influencing the prediction performance. - Author(s): J.-H. Yi
- Source: Electronics Letters, Volume 36, Issue 24, p. 2009 –2010
- DOI: 10.1049/el:20001389
- Type: Article
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p.
2009
–2010
(2)
The application of a first-order regularisation technique to the problem of reconstruction of visible surfaces is described. The approach is a computationally efficient first-order method that achieves approximate invariance. The results indicate that the proposed method for surface reconstruction performs well on sparse noisy range data.
Feature-based initialisation for image vector quantisation codebook generation
Robust edge-preserving image restoration in the presence of non-Gaussian noise
Successive elimination algorithm for binary block matching motion estimation
Viewpoint invariant reconstruction of visible surfaces using first-order regularisation
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- Author(s): V.C. da Rocha
- Source: Electronics Letters, Volume 36, Issue 24, p. 2010 –2012
- DOI: 10.1049/el:20001427
- Type: Article
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p.
2010
–2012
(3)
A novel construction technique of protocol sequences for the users of a collision channel without feedback is introduced. This construction is a generalisation of the Massey-Mathys construction, with the practical advantage that the resulting cycle length N is typically much shorter, being at most equal to that obtained by the Massey-Mathys construction. The sender of each successfully transmitted packet is identified by a generalised version of the decimation decoding technique.
Protocol sequences for collision channel without feedback
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- Author(s): C. Mair and C.J. Goodman
- Source: Electronics Letters, Volume 36, Issue 24, p. 2012 –2013
- DOI: 10.1049/el:20001393
- Type: Article
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p.
2012
–2013
(2)
A depth-from-defocus reconstruction formula for a diffraction-limited imaging system is derived. The result shows that the commonly used reconstruction formula obtained from geometric optics does not hold for large sensor displacements. Moreover, it suggests that the unknown correction factor of the geometrical reconstruction formula equals 1/π. - Author(s): K. Higuma ; Y. Hashimoto ; M. Yatsuki ; H. Nagata
- Source: Electronics Letters, Volume 36, Issue 24, p. 2013 –2014
- DOI: 10.1049/el:20001260
- Type: Article
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p.
2013
–2014
(2)
In LiNbO3 electro-optical devices, the symmetric design of the pair of ground-electrodes is an important factor in suppressing the thermal drift. Although conventional x-cut LiNbO3 Mach-Zehnder modulators installed with identical ground-electrodes exhibit ≤ 1 V in their bias change between 10 and 60°C, the asymmetric electrode design to narrow one ground-electrode (to approximately one-quarter in experiments) demonstrates that the bias change increases to 3 to 6 V.
Diffraction-limited depth-from-defocus
Electrode design to suppress thermal drift in lithium niobate modulators
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- Author(s): L.J. Sargent ; A.B. Massara ; P.J. Heard ; R.V. Penty ; I.H. White
- Source: Electronics Letters, Volume 36, Issue 24, p. 2014 –2016
- DOI: 10.1049/el:20001423
- Type: Article
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p.
2014
–2016
(3)
A single longitudinal mode laser has been produced using a two-dimensional-lattice distributed reflector grating. The device exhibits singlemode suppression ratios of > 27 dB with a small signal bandwidth of 11 GHz and stable spectra under modulation at 10 Gbit/s. - Author(s): G. Sorbello ; L. Pallaro ; S. Taccheo
- Source: Electronics Letters, Volume 36, Issue 24, p. 2016 –2017
- DOI: 10.1049/el:20001386
- Type: Article
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p.
2016
–2017
(2)
A linearly polarised single-frequency diode-pumped Er:Yb bulk laser with output power in excess of 100 mW has been demonstrated. The use of an anisotropic absorptive intracavity etalon to achieve both single-frequency operation and linearly polarised output is investigated. Output power and tuning characteristics as well as relative-intensity noise measurements are reported. A new active medium, based on a new glass host with reduced pump-induced birefringence, allowed for negligible performance degradation when using the anisotropic etalon instead of a standard BK7 etalon. A broad tuning range and a relative-intensity-noise peak of about –90 dB/Hz has been achieved. - Author(s): S. Sato ; N. Nishiyama ; T. Miyamoto ; T. Takahashi ; N. Jikutani ; M. Arai ; A. Matsutani ; F. Koyama ; K. Iga
- Source: Electronics Letters, Volume 36, Issue 24, p. 2018 –2019
- DOI: 10.1049/el:20001430
- Type: Article
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p.
2018
–2019
(2)
Electrically pumped near 1.3 µm GaInNAs/GaAs vertical-cavity surface-emitting lasers grown by metalorganic chemical vapour deposition are demonstrated for the first time. The threshold current and voltage under continuous wave operation of a 10 × 10 µm2 oxide aperture device were 7.6 mA and 2.8 V, respectively. The output power exceeded 0.1 mW and the slope efficiency was ~0.1 W/A. - Author(s): Y. Hong ; K.A. Shore ; A. Larsson ; M. Ghisoni ; J. Halonen
- Source: Electronics Letters, Volume 36, Issue 24, p. 2019 –2020
- DOI: 10.1049/el:20001390
- Type: Article
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p.
2019
–2020
(2)
Pure frequency-polarisation bistability in a vertical cavity surface-emitting semiconductor laser subject to optical injection has been observed. It was found that the width of the bistability loop may be enhanced by increasing the injection power.
10 Gbit/s singlemode operation of two-dimensional-lattice distributed reflector laser
20 dBm linearly polarised tunable single-frequency diode-pumped Er:Yb laser at 1535 nm using anisotropic absorptive intracavity etalon
Continuous wave operation of 1.26 µm GaInNAs/GaAs vertical-cavity surface-emitting lasers grown by metalorganic chemical vapour deposition
Pure frequency-polarisation bistability in vertical cavity surface-emitting semiconductor laser subject to optical injection
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- Author(s): P. Nakmahachalasint and Khai D.T. Ngo
- Source: Electronics Letters, Volume 36, Issue 24, p. 2020 –2022
- DOI: 10.1049/el:20001435
- Type: Article
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p.
2020
–2022
(3)
An improved domain-wall surface function R(m) is suggested for the static domain-wall hysteresis model proposed by Basso and Bertotti to better characterise the very soft saturation behaviour of manganese-zinc (MnZn) ferrites. The improved model is verified against experimental data for the major and minor hysteresis loops of three commercial MnZn ferrites.
Improved domain-wall model of static hysteresis for power ferrites
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- Author(s): Lung-Hwa Hsieh and Kai Chang
- Source: Electronics Letters, Volume 36, Issue 24, p. 2022 –2023
- DOI: 10.1049/el:20001433
- Type: Article
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p.
2022
–2023
(2)
A novel dual-mode, compact, and simple elliptic-function bandpass filter structure without coupling gaps is proposed. This filter has insertion loss < 1.5 dB and return loss > 10 dB within 2.3–2.375 GHz. Without coupling gaps between the feed lines and the patch resonator, the new filter can provide a low insertion loss and reduce uncertainty in fabrication.
Dual-mode elliptic-function bandpass filter using one single patch resonator without coupling gaps
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- Author(s): T. Conway
- Source: Electronics Letters, Volume 36, Issue 24, p. 2023 –2025
- DOI: 10.1049/el:20001395
- Type: Article
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p.
2023
–2025
(3)
A coding method with low complexity decoding is described. The method provides good coding gain on partial response channels such as tape drive channels. The method is based on a product code combined with suitable reordering. Decoding employs soft decision detection on the partial response channel and iterative decoding of the product code. The code complexity is largely independent of the partial response characteristics. - Author(s): H. Behairy and S.-C. Chang
- Source: Electronics Letters, Volume 36, Issue 24, p. 2025 –2026
- DOI: 10.1049/el:20001397
- Type: Article
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p.
2025
–2026
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A class of concatenated codes called parallel concatenated Gallager codes (PCGCs) in which low density parity check (LDPC) codes are used as the component codes is presented. Simulation results for PCGCs that outperform comparable LDPC codes in an AWGN channel are also presented. - Author(s): Soonyoung Kim ; Jinsu Chang ; Moon Ho Lee
- Source: Electronics Letters, Volume 36, Issue 24, p. 2026 –2027
- DOI: 10.1049/el:20001432
- Type: Article
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p.
2026
–2027
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An efficient iterative decoding stop criterion is proposed that can reduce the delay and computation time. The proposed preset method is based on the SNR estimation and stop criterion concept. It uses adaptation of the maximum iteration number according to the CSI (channel state information) and the criterion of the delta variance parameter in the decoding process.
Low complexity iterative decoding for PRML tape channels
Parallel concatenated Gallager codes
Simple iterative decoding stop criterion for wireless packet transmission
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- Author(s): M. Nakazawa ; T. Yamamoto ; K.R. Tamura
- Source: Electronics Letters, Volume 36, Issue 24, p. 2027 –2029
- DOI: 10.1049/el:20001391
- Type: Article
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p.
2027
–2029
(3)
A single wavelength channel, optical time division multiplexed and polarisation multiplexed 1.28 Tbit/s signal has been successfully transmitted over 70 km. Third- and fourth-order simultaneous dispersion compensation was used with a 10 GHz synchronous phase modulator. The input pulsewidth was 380 fs, and the transmitted pulse width was 400 fs. All 128 channels demultiplexed to 10 Gbit/s had a bit error rate of less than 1 × 10-9. - Author(s): L.J. Richardson ; W. Forysiak ; K.J. Blow
- Source: Electronics Letters, Volume 36, Issue 24, p. 2029 –2030
- DOI: 10.1049/el:20001405
- Type: Article
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p.
2029
–2030
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Single channel transmission over 6000 km using short period dispersion management with no active control is demonstrated by numerical simulation. The performance of the system is limited by noise-induced interactions. - Author(s): A. Lupu ; H. Sik ; A. Mereuta ; P. Boulet ; M. Carré ; S. Slempkes ; A. Ougazzaden ; A. Carenco
- Source: Electronics Letters, Volume 36, Issue 24, p. 2030 –2032
- DOI: 10.1049/el:20001402
- Type: Article
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p.
2030
–2032
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A multiplexer/demultiplexer based on a meander-type InP grating-assisted codirectional coupler is reported. It provides simultaneous bidirectional operation at two different wavelengths within the same 1.3 µm window, as well as high bit rate distribution at 1.5 µm. The same demultiplexer is usable in both optical terminals of a 1.3+ or 1.3-/1.5 µm access network.
1.28 Tbit/s–70 km OTDM transmission using third- and fourth-order simultaneous dispersion compensation with a phase modulator
Single channel 320 Gbit/s short period dispersion managed transmission over 6000 km
Three-waveguide two-grating codirectional coupler for 1.3-/1.3+/1.5 µm demultiplexing in transceiver
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- Author(s): Y.O. Noh ; M.-S. Yang ; Y.H. Won ; W.-Y. Hwang
- Source: Electronics Letters, Volume 36, Issue 24, p. 2032 –2033
- DOI: 10.1049/el:20001431
- Type: Article
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p.
2032
–2033
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A novel voltage-controlled variable optical attenuator based on a polymeric planar lightwave circuit (PLC) is demonstrated. The fabricated variable attenuator shows 30 dB attenuation with only 80 mW electrical input power at 1.55 µm. The polarisation dependences at 0 and 10 dB attenuations are 0.2 and 1 dB, respectively. The rise and fall times are less than 5 ms.
PLC-type variable optical attenuator operated at low electrical power
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- Author(s): T. Nakata ; T. Takeuchi ; I. Watanabe ; K. Makita ; T. Torikai
- Source: Electronics Letters, Volume 36, Issue 24, p. 2033 –2034
- DOI: 10.1049/el:20001421
- Type: Article
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p.
2033
–2034
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The development of waveguide avalanche photodiodes with a very thin 0.1 µm multiplication layer for use in high-speed, high-sensitivity, low-voltage-operation receivers is presented. A η = 76%, a GB product of 180 GHz, and a breakdown voltage Vb of 15 V were obtained. The 10 Gbit/s bit error rate measurement showed a sensitivity of –28.8 dBm (BER 10-9, PRBS 223–1), which is the highest sensitivity yet reported for APD receivers. - Author(s): H. Ito ; T. Furuta ; S. Kodama ; T. Ishibashi
- Source: Electronics Letters, Volume 36, Issue 24, p. 2034 –2036
- DOI: 10.1049/el:20001438
- Type: Article
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p.
2034
–2036
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A novel cascade-twin unitravelling-carrier photodiode (UTC-PD), which is suitable for zero-bias high-speed and high-output-voltage operation, is achieved by monolithically integrating two UTC-PDs and a 3 dB optical beam splitter. Under zero-bias conditions, the fabricated device exhibits high output voltages of 0.75, 0.5 and 0.25 V with 3 dB bandwidths of 20, 40 and 60 GHz, respectively.
10 Gbit/s high sensitivity, low-voltage-operation avalanche photodiodes with thin InAlAs multiplication layer and waveguide structure
Zero-bias high-speed and high-output-voltage operation of cascade-twin unitravelling-carrier photodiode
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- Author(s): S.S. Chakraborty and M. Liinaharja
- Source: Electronics Letters, Volume 36, Issue 24, p. 2036 –2037
- DOI: 10.1049/el:20001398
- Type: Article
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p.
2036
–2037
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Analysis of an adaptive selective repeat-automatic repeat request scheme in a time-varying channel is presented. In addition, the authors discuss the limitations of the analysis of a modified scheme proposed recently. - Author(s): D.P. McNamara ; M.A. Beach ; P.N. Fletcher ; P. Karlsson
- Source: Electronics Letters, Volume 36, Issue 24, p. 2037 –2038
- DOI: 10.1049/el:20001437
- Type: Article
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p.
2037
–2038
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Measurements of indoor multiple-input multiple-output (MIMO) channels have been conducted at 5.2 GHz and their information theoretic capacity analysed. It has been found that the variation of received signal-to-noise ratio has a greater influence on this capacity than the variation due to changes in the correlation of the channel response matrix. - Author(s): Qian Liang
- Source: Electronics Letters, Volume 36, Issue 24, p. 2038 –2040
- DOI: 10.1049/el:20001434
- Type: Article
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p.
2038
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An explicit code-division multiple access/packet-reservation multiple access (CDMA/PRMA) protocol is proposed in response to the disadvantage of the conventional CDMA/PRMA protocol, the permission probability of which estimated from the channel access function limits the access efficiency when the overall system load remains low. The proposed protocol is shown to yield improvements at the expense of introducing an explicit slot assignment mechanism. - Author(s): Jia-Chin Lin
- Source: Electronics Letters, Volume 36, Issue 24, p. 2040 –2041
- DOI: 10.1049/el:20001425
- Type: Article
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2040
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A new code tracking loop is proposed for direct-sequence spread-spectrum communications. The main features of such a technique are its lower complexity together with its good tracking performance. Analytical expressions for the error characteristic are derived and timing jitter is evaluated by computer simulation. - Author(s): T.C. Chuah ; B.S. Sharif ; O.R. Hinton
- Source: Electronics Letters, Volume 36, Issue 24, p. 2041 –2043
- DOI: 10.1049/el:20001415
- Type: Article
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p.
2041
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A space-time detection scheme combining nonlinear decorrelators and antenna array is investigated for jointly mitigating multiple access interference, multipath fading and impulsive noise. Monte Carlo simulation results of the proposed space-time detector are presented to justify the relative merits of nonlinear signal processing techniques in the spatial-temporal domain.
Analysis of adaptive SR ARQ scheme in time-varying channels
Capacity variation of indoor multiple-input multiple-output channels
Explicit CDMA/PRMA in cellular environment
Low-complexity code tracking loop with chip-level differential detection for DS/SS receivers
Nonlinear space-time decorrelator for multiuser detection in non-Gaussian channels
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- Author(s): G. Simin ; X. Hu ; N. Ilinskaya ; A. Kumar ; A. Koudymov ; J. Zhang ; M. Asif Khan ; R. Gaska ; M.S. Shur
- Source: Electronics Letters, Volume 36, Issue 24, p. 2043 –2044
- DOI: 10.1049/el:20001401
- Type: Article
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2043
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A fast high-power solid-state switch based on a novel large periphery multigate AlGaN/GaN metal-oxide-semiconductor heterostructure field effect transistor (MOSHFET) over 4H-SiC substrates is demonstrated. For a device with 1 mm periphery and 10 µm gate-drain spacing, 7.5 kW/mm2 of switched power with on-state resistance of 75 mΩ × mm2 is obtained. The pulse response of the MOSHFET switch exhibited a rise-time < 5 ns in pulsemode operation. - Author(s): S. Pal ; S.K. Ray ; S. Lahiri ; D.N. Bose
- Source: Electronics Letters, Volume 36, Issue 24, p. 2044 –2046
- DOI: 10.1049/el:20001410
- Type: Article
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p.
2044
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Dielectric films from gadolinium gallium garnet single crystal were deposited by electron-beam evaporation on strained Si1-xGex/Si layers at 300 K to form high-k metal-insulator-semiconductor (MIS) structures. The p-Si0.74Ge0.26/Ga2O3(Gd2O3) interface properties were studied through C-V and G-V measurements of the MIS capacitors, which showed encouraging electrical characteristics with oxide k = 12.3 and minimum interface state density Dit of 4.8 × 1011 cm-2eV-1. - Author(s): N. Matsuo ; Y. Takami ; Y. Kitagawa ; T. Miyoshi
- Source: Electronics Letters, Volume 36, Issue 24, p. 2046 –2047
- DOI: 10.1049/el:20001403
- Type: Article
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p.
2046
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The modelling of direct tunnelling (DT) through thin SiO2 films on n-type Si(100) using the WKB method is discussed. The emission of the electron from the quantised energy level at the SiO2/Si interface and the accumulation of the electron at the interface are assumed. By calculating the DT currents using this model, the reproducibility of the I-V characteristics is examined. - Author(s): J.P. Karamarković and N.D. Janković
- Source: Electronics Letters, Volume 36, Issue 24, p. 2047 –2048
- DOI: 10.1049/el:20001411
- Type: Article
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2047
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A modified drift-diffusion model for the simulation of quasi-ballistic transport in short-base bipolar transistors has been proposed. It includes the effects of base end velocity overshoot and reduction in the minority-carrier diffusion coefficient. Numerical results show good agreement with those obtained by Monte Carlo simulation.
7.5 kW/mm2 current switch using AlGaN/GaN metal-oxide-semiconductor heterostructure field effect transistors on SiC substrates
Ga2O3(Gd2O3) film as high-k gate dielectric for SiGe MOSFET devices
Modelling of direct tunnelling for thin SiO2 film on n-type Si(100) by Wentzel, Kramers, Brillouin method
Modification of drift-diffusion model for short base transport
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- Author(s): Tai-Kuo Woo
- Source: Electronics Letters, Volume 36, Issue 24, p. 2049 –2050
- DOI: 10.1049/el:20001420
- Type: Article
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p.
2049
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It is known that the convergence rate of the LMS algorithm is slow, especially when the channel has severe spectral nulls. The convergence rate of RLS is fast, but the computational complexity is high. A hierarchical RLS algorithm is proposed to reduce the computational complexity and increase the convergence rate of the RLS. - Author(s): A. Belouchrani and A. Cichocki
- Source: Electronics Letters, Volume 36, Issue 24, p. 2050 –2051
- DOI: 10.1049/el:20001436
- Type: Article
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p.
2050
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An efficient algorithm is presented for robust whitening in the presence of temporally uncorrelated additive noise that may be spatially correlated. This whitening is introduced as a pre-processing step in the blind source separation process. The robust whitening consists in the eigenvalue decomposition of a positive definite linear combination of a set a correlation matrices taken at nonzero lags. The coefficients of the linear combination are computed by a finite step global convergence algorithm. Some numerical simulations are provided to illustrate the effectiveness of the solution.
Hierarchical RLS algorithm for adaptive transversal FIR filters
Robust whitening procedure in blind source separation context
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- Author(s): H. Sayoud ; K. Takahashi ; B. Vaillant
- Source: Electronics Letters, Volume 36, Issue 24, p. 2051 –2053
- DOI: 10.1049/el:20001406
- Type: Article
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p.
2051
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The application of a specialised genetic algorithm to the solution of the NP-complete ATM network topology design and capacity assignment problem is considered. It is shown that the developed binary encoding scheme combined with different genetic operator representations and the use of elitism is ideally suited to this type of problem and that computational techniques using this approach lead to a rapid and effective solution for networks of this class.
Minimum cost topology optimisation of ATM networks using genetic algorithms
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