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Electronics Letters

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Displaying Results 1 - 25 of 55
• Quantitative images of large biological bodies in microwave tomography by using numerical and real data

Publication Year: 1996, Page(s):2138 - 2140
Cited by:  Papers (9)
| | PDF (715 KB)

A new inverse microwave imaging algorithm is presented which has the ability to obtain quantitative dielectric maps of large biological bodies. By using a priori information, obtained with a first order algorithm, the final image is obtained by solving the direct problem and an ill-conditioned system of equations into an iterative procedure. The algorithm has been successfully tested with real dat... View full abstract»

• Reduction of four-wave mixing induced penalty in unequally spaced WDM transmission system by using optical DPSK

Publication Year: 1996, Page(s):2118 - 2119
Cited by:  Papers (6)  |  Patents (6)
| | PDF (224 KB)

Optical DPSK signalling is employed in unequally spaced WDM transmission systems using dispersion-shifted fibres to reduce the penalty caused by four-wave mixing. More than 10 dB reduction in power penalty is achieved compared with the use of intensity modulation View full abstract»

• Flat lens antenna concept using aperture coupled microstrip patches

Publication Year: 1996, Page(s):2109 - 2111
Cited by:  Papers (67)  |  Patents (8)
| | PDF (352 KB)

A planar lens antenna based on aperture coupled microstrip patch elements with stripline delay lines is described. Features of this design are discussed, and results for transmission coefficient magnitude against frequency are presented. The background for the development of this lens configuration is discussed in terms of a natural progression from frequency selective surfaces, and the inadequaci... View full abstract»

• Precise glottal closure instant detector for voiced speech

Publication Year: 1996, Page(s):2117 - 2118
| | PDF (240 KB)

An algorithm which can extract precise glottal closure instant (GCI) information directly from speech is described. By utilising the average pitch and the area informations, accurate GCI positions are obtained. The result compared with the manually classified GCI information using EGG signals only shows 0.2 ms average error View full abstract»

• 10 Gbit/s repeaterless transmission over 250 km standard fibre

Publication Year: 1996, Page(s):2155 - 2156
Cited by:  Papers (4)  |  Patents (1)
| | PDF (232 KB)

The authors demonstrate experimentally 10 Gbit/s repeaterless transmission at 1.55 μm over the record length of 250 km standard singlemode fibre using pre-distorted ASK transmission and a dispersion compensating fibre in the receiver View full abstract»

• Detection of microwave radiation by electronic fluid in high electron mobility transistors

Publication Year: 1996, Page(s):2148 - 2149
Cited by:  Papers (16)
| | PDF (212 KB)

The authors present a microwave detector which utilises the nonlinear properties of 2D electronic fluid in a high electron mobility transistor (HEMT). The detector operates between 8 and 18 GHz and the measured responsivity is in good agreement with the recent theory of 2D electronic fluids View full abstract»

• Approximations for the cylindrical wire kernel

Publication Year: 1996, Page(s):2108 - 2109
Cited by:  Papers (1)
| | PDF (204 KB)

The authors introduce several new approximations to the cylindrical wire kernel. These approximations are derived from a recently found exact series solution for the cylindrical wire kernel. It is also demonstrated that the well-known reduced kernel and far-zone approximations may be obtained as special limiting cases of this series View full abstract»

• Interference cancellation scheme with simple structure and better performance

Publication Year: 1996, Page(s):2115 - 2117
Cited by:  Papers (2)  |  Patents (2)
| | PDF (332 KB)

The authors propose a new interference cancellation (IC) scheme which has a hybrid structure of the successive IC scheme and the parallel IC scheme. Based on computer simulation results, it is observed that the proposed IC scheme outperforms these two IC schemes for CDMA systems View full abstract»

• Doped fibre length and pump power of gain-flattened EDFAs

Publication Year: 1996, Page(s):2161 - 2162
Cited by:  Papers (5)  |  Patents (3)
| | PDF (232 KB)

A simple method for determining the doped fibre length and the pump power of gain-flattened EDFAs has been proposed on the basis of average inversion of the erbium ions with maximum gain flatness. The difference between the obtained and the desired gains to achieve the output power per channel of -5-+5 dBm while maintaining the maximum gain flatness was <±0.3 dB View full abstract»

• Performance enhancement for fuzzy adaptive resonance theory (ART) neural networks

Publication Year: 1996
Cited by:  Papers (2)
| | PDF (116 KB)

A modified fuzzy adaptive resonance theory neural network (ART) is used as a classifier for a texture recognition system. The system consists of a wavelet based low level feature detector and a high level ART classifier. The performance improvement is measured in terms of identification accuracy and computational burden View full abstract»

• Solid state polymer dye Q-switch for Cr:LiCAF, alexandrite, and ruby lasers

Publication Year: 1996, Page(s):2146 - 2148
| | PDF (292 KB)

We report passive Q-switching of the Cr3+:LiCaAlF6 (Cr:LiCAF) laser, Cr3+:BeAl2O4 (alexandrite) laser, and Cr3+:Al2O3 (ruby) laser with a durable solid state polymer dye Q-switch: 1,1',3,3,3',3'-hexamethylindotricarbocyanine iodide (HITCI) doped organically modified silicate (ORMOSIL) saturable absorber View full abstract»

• Analysis of broadband microstrip-slotline transitions with multi-arm stubs

Publication Year: 1996, Page(s):2106 - 2108
Cited by:  Papers (7)  |  Patents (1)
| | PDF (288 KB)

For a compromised design of microstrip-slotline transitions with multi-arm stubs, the relation between the number of arms and the bandwidth is necessary. This issue is examined using a modelling technique based on the equivalent circuit of the transition. The technique is used to analyse two broadband (1-10 GHz and 5-50 GHz) transitions with stubs having different number of arms View full abstract»

• Genetic approach to select wavelet features for contour extraction in medical ultrasonic imaging

Publication Year: 1996, Page(s):2137 - 2138
| | PDF (352 KB)

An efficient and robust approach, which is based on wavelet transform (WT), is proposed for contour extraction for medical ultrasonic images having low signal-to-noise ratio. Furthermore the best wavelet features for profile analysis is estimated by GAs without manual operation. No image preprocessing is needed, so computation time is fast. Experimental results to confirm the proposed algorithm ar... View full abstract»

• Fast-convergence filtered regressor algorithms for blind equalisation

Publication Year: 1996, Page(s):2114 - 2115
Cited by:  Papers (9)  |  Patents (1)
| | PDF (248 KB)

The authors present a simple extension of the standard Bussgang blind equalisation algorithms that significantly improves their convergence properties. The technique uses the inverse channel estimate to filter the regressor signal. The modified algorithms provide quasi-Newton convergence in the vicinity of a local minimum of the chosen cost function with only a modest increase in the overall compu... View full abstract»

• All-optical gain-clamped EDFAs with different feedback wavelengths for use in multiwavelength optical networks

Publication Year: 1996, Page(s):2159 - 2161
Cited by:  Papers (10)  |  Patents (4)
| | PDF (316 KB)

The authors compare performances of all-optical gain-clamped 980 nm pumped erbium-doped fibre amplifiers. These are compared in terms of static behaviour, dynamic performance, and noise figure, for three different feedback wavelengths, 1532, 1543, and 1565 nm in a 2.5 Gbit/s eight-channel wavelength-division-multiplexed transmission experiment View full abstract»

• On-line training and pruning for recursive least square algorithms

Publication Year: 1996, Page(s):2152 - 2153
Cited by:  Papers (16)
| | PDF (216 KB)

The authors derive a pruning method for recursive least square (RLS) based algorithms. In this approach, training (on-line type) and pruning are combined. Simulation results showed that this approach is an effective training and pruning method for neural networks View full abstract»

• Noise suppression effect in cascaded wavelength conversion using light-injected DFB-LDs

Publication Year: 1996, Page(s):2165 - 2166
Cited by:  Papers (1)
| | PDF (224 KB)

Cascaded wavelength conversion using optically modulated DFB-LDS is described. It is demonstrated that signal fluctuation is efficiently suppressed in two-stage conversion, since fluctuation in both on'- and off'-states was reduced through the conversion process View full abstract»

• Optimum gain-equalised configuration of wideband erbium-doped fibre amplifier using inter-stage samarium-doped fibre and midway isolator

Publication Year: 1996, Page(s):2175 - 2177
Cited by:  Papers (3)  |  Patents (2)
| | PDF (344 KB)

The optimum gain-equalised configuration for the erbium-doped fibre amplifier (EDFA) using a samarium-doped fibre (SDF) is investigated. The dual-pumping scheme with inter-stage SDF and midway isolator was found to be the optimum scheme for obtaining flattened high spectral gain with variation of ⩽±0.7 dB and with a low noise figure of ⩽5.6 dB within the 1530-1560 nm range. This amp... View full abstract»

• Bias-free 1 Gbit/s data transmission using singlemode GaAs VCSELs at λ=835 nm

Publication Year: 1996, Page(s):2145 - 2146
Cited by:  Papers (8)
| | PDF (232 KB)

Bias-free 1 Gbit/s pseudo-random data transmission using a laterally oxidised singlemode GaAs vertical-cavity surface-emitting laser is demonstrated and compared to biased modulation. A bit error-rate of 10-11 obtained -28 dBm received optical power makes these laser devices very attractive for optical interconnection View full abstract»

• Measurement method of electromagnetic transmission loss of building components using two reverberation chambers

Publication Year: 1996, Page(s):2130 - 2131
Cited by:  Papers (5)
| | PDF (228 KB)

A new method for measuring the transmission loss of building components is presented. The component is mounted in the separating wall between two reverberation chambers. The electromagnetic field is diffuse. Comparisons between measurements and theory for a metallic grid validate the method View full abstract»

• Random discrete PWM method for DC-DC power converters

Publication Year: 1996, Page(s):2105 - 2106
Cited by:  Papers (7)  |  Patents (1)
| | PDF (216 KB)

A random discrete pulse-width modulation (RDPWM) scheme is examined and compared with the randomised pulse-position modulation (RPPM) method for DC-DC power conversion. The RDPWM method has no switching harmonics while the RPPM method has significant switching harmonics. Power spectral characteristics of the two methods are presented and discussed View full abstract»

• Wavelength conversion with an optical parametric loop mirror

Publication Year: 1996, Page(s):2171 - 2172
Cited by:  Papers (1)  |  Patents (2)
| | PDF (200 KB)

Wavelength conversion of a 6.3 Gbit/s optical pulse signal based on four-wave mixing (FWM) has been demonstrated utilising an optical parametric loop mirror (PALM) which can separate the generated FWM wave from the input signal and pump waves without optical filtering. Bit error rate measurements have revealed that the PALM can achieve error free operation without optical filtering and can improve... View full abstract»

• Efficient search algorithm for fast encoding of images using vector quantisation

Publication Year: 1996, Page(s):2135 - 2137
| | PDF (352 KB)

A fast algorithm for image coding using vector quantisation which exploits the spatial redundancies in the image is proposed. The algorithm speeds up the codeword search phase required for nearest neighbour encoding, by utilising the high amount of intravector and intervector correlations. A novel prediction mechanism is used to exploit the intervector correlations and a mean pyramid representatio... View full abstract»

• Comment on new differential flip-flops from Yuan and Svensson

Publication Year: 1996, Page(s):2125 - 2126
Cited by:  Papers (4)
| | PDF (208 KB)

A family of differential latches has recently been proposed by Yuan and Svensson [1996]. The author shows that the proposed flip-flops using the dynamic slave latch suffer from a poor logic-level zero in the presence of glitches on the data inputs View full abstract»

• Extinction ratio induced crosstalk system penalty in WDM networks

Publication Year: 1996, Page(s):2112 - 2114
Cited by:  Papers (4)
| | PDF (332 KB)

The authors derive an analytical solution for crosstalk-induced penalty in wavelength routers with consideration of the extinction ratio. Both theoretical and experimental results suggest that the extinction ratio can induce a system penalty and should be kept to at least ~15 dB to maintain the penalty below 1 dB for a total crosstalk level of ~-23 dB View full abstract»

Aims & Scope

Electronics Letters is internationally renowned for its rapid communication of new developments and emerging topics across the broad and interdisciplinary field of modern electronics and electrical engineering.

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Meet Our Editors

Editors-in-Chief

Professor Chris Toumazou
Director of the Biomedical Institute
Imperial College, London, UK

Professor Ian White