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# Electronics Letters

## Filter Results

Displaying Results 1 - 25 of 89
• ### VQ codebook design using genetic algoriithm [Reply]

Publication Year: 1996
Cited by:  Papers (1)
| | PDF (157 KB)

First Page of the Article
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• ### Performance of an adaptive multichannel combiner for long range underwater communications

Publication Year: 1996, Page(s):182 - 183
Cited by:  Papers (4)
| | PDF (228 KB)

The authors describe the implementation of LMS and RLS adaptive multichannel combiners for a 50 km underwater acoustic channel, and present experimental results on their performance. BPSK transmission was used and the phase constellation plots obtained show that both combiners achieve a significant improvement in SINR and BER over single elements View full abstract»

• ### Parameter threshold in type-II traffic for banyan networks

Publication Year: 1996, Page(s):181 - 182
Cited by:  Papers (2)
| | PDF (256 KB)

Banyan networks are frequently employed in fast packet switches and it is important to evaluate their performance under heterogeneous traffic requirements. Type-II traffic is a frequently employed heterogeneous traffic type. The authors show that to evaluate the performance of a banyan network under type-II traffic there is no need to employ more than a threshold amount of parameters View full abstract»

• ### Parameter estimation in CDMA multiuser detection using cyclostationary statistics

Publication Year: 1996, Page(s):179 - 181
Cited by:  Papers (6)
| | PDF (316 KB)

The authors propose a simple algorithm to jointly estimate the amplitude, phase, and time delay of each individual signal in the multiuser detection of a code division multiple access (CDMA) signal. The algorithm exploits the cyclostationary nature of the CDMA signal by estimating its cyclic and conjugate cyclic spectra. Its complexity increases linearly with the number of users View full abstract»

• ### Optimum demodulation of PN spread spectrum signals in the presence of narrowband interference

Publication Year: 1996, Page(s):178 - 179
Cited by:  Papers (2)
| | PDF (220 KB)

The optimum demodulation code for pseudo-noise (PN) binary phase shift keying systems in the presence of a strong sinusoidal interference is shown to be the sum of the PN code and a sinusoidal sequence. The new demodulation method has greatly improved performance compared to PN code demodulation View full abstract»

• ### 622MHz current-mode sense amplifier

Publication Year: 1996, Page(s):154 - 156
Cited by:  Papers (3)  |  Patents (3)
| | PDF (316 KB)

A current-mode sense amplifier, operating at 622 MHz, in a 0.8 μm CMOS process is proposed. The basic ideas are to modify the reset mechanism and precharge timing of the earlier CBLSA design to allow robust sensing with single phase clocking, as well as TSPC compatible output timing View full abstract»

• ### Er-indiffused Ti:LiNbO3 channel waveguide optical amplifiers pumped at 980 nm

Publication Year: 1996, Page(s):215 - 216
Cited by:  Papers (6)  |  Patents (1)
| | PDF (240 KB)

Er-indiffused Ti:LiNbO3 optical channel waveguide amplifiers pumped at 980 nm are reported for the first time. The authors report the largest differential gain and pump efficiency to date. At a coupled pump power of 80 mW, the amplifiers show a steady-state small signal gain of 1.6 dB/cm over a 1.7 cm long waveguide. Larger gain coefficients (~3 dB/cm) were observed before photorefracti... View full abstract»

• ### New ternary trellis code for the AWGN and the 1-D partial response channel

Publication Year: 1996, Page(s):177 - 178
Cited by:  Papers (1)
| | PDF (216 KB)

A new ternary trellis code of rate 1/3 with a DC free power density spectrum containing a spectral null at ω=0 is presented. This code shows good distance properties when applied to an ISI free channel as well as to a 1-D partial response channel View full abstract»

• ### 50 Ω noise measurements with full receiver calibration without tuner

Publication Year: 1996, Page(s):261 - 262
Cited by:  Papers (3)
| | PDF (212 KB)

A 50 Ω high frequency noise measurement has been developed. A new approach for calculating the four noise parameters is presented. This method necessitates no isolator and has broadband capacities. Receiver calibration and F50 HEMT measurements are presented View full abstract»

• ### Printed half-wavelength quadrifilar helix antenna for GPS marine applications

Publication Year: 1996, Page(s):153 - 154
Cited by:  Papers (11)  |  Patents (7)
| | PDF (220 KB)

The authors present a new printed half-wavelength quadrifilar helix antenna using infinite microstrip feeding baluns. This new volute antenna allows low cost, ease of mass production, and substantially improved elevation pattern coverage and circular polarisation properties. Experimental results show that the printed volute antenna has a 3dB beamwidth of >145° and a front-back ratio of >... View full abstract»

• ### Effect of contact recombination on the transverse conductivity distribution in photoexcited semiconductor coplanar waveguides

Publication Year: 1996, Page(s):213 - 215
| | PDF (324 KB)

A modified 1-D approximation for the 2-D diffusion-controlled distribution of photoconductivity in the cross-sectional region of illuminated semiconductor coplanar waveguides (CPW) is presented, taking into account contact recombination at the strip and ground plane metallisation View full abstract»

• ### VQ codebook design using genetic algorithm [comment and reply]

Publication Year: 1996, Page(s):193 - 194
Cited by:  Patents (1)
| | PDF (208 KB)

The original authors assert that to their knowledge no one has applied genetic algorithms to optimisation of codebooks' [see ibid., vol. 31, no. 17, p. 1418-9 (1995)]. I would like to point out to the reader that a Letter by M. Koschorreck and V. Delport entitled Genetic algorithm for codebook design in vector quantisation' was published in Electronics Letters, vol. 31, no. 2, p. 84-85 (1995). A... View full abstract»

• ### Irreducible BER of COFDM on an IIR channel

Publication Year: 1996, Page(s):175 - 176
Cited by:  Papers (2)
| | PDF (216 KB)

The author considers the performance of coded orthogonal frequency division multiplexing (COFDM) on an infinite impulse response channel, and gives equations for intersymbol and interchannel interference (ISI and ICI). The trade-off between code rate and guard period length is considered, and it is shown that for optimum results both coding and a guard period are required. However, the advantage o... View full abstract»

• ### Path loss statistics and mechanisms of transhorizon propagation over a sea path

Publication Year: 1996, Page(s):259 - 261
Cited by:  Papers (1)  |  Patents (101)
| | PDF (332 KB)

Carrier amplitude data at 11.6 GHz captured on four parallel transhorizon links over the sea have been divided into four groups according to the identified dominating propagation mechanisms. The statistics of path loss are each found to be lognormal. The rate of occurrence of the mechanisms is investigated relative to transmitter/receiver heights, diffraction and evaporation ducting View full abstract»

• ### Approximation to M/D/1 for ATM CAC, buffer dimensioning and cell loss performance

Publication Year: 1996, Page(s):164 - 165
Cited by:  Papers (4)
| | PDF (220 KB)

The authors derive a new, accurate, closed form approximation for the M/D/I queue. This can be arranged to yield expressions for the cell loss probability, the admissible load and the buffer length. These expressions have a direct application to cell scale queueing in ATM networks View full abstract»

• ### Printed cylindrical slot antenna for GPS commercial applications

Publication Year: 1996, Page(s):151 - 152
Cited by:  Papers (3)
| | PDF (216 KB)

The authors present a new printed cylindrical slot antenna for GPS commercial applications. This antenna displays compact size, low cost, ease of mass production, near-hemispherical radiation coverage and circular polarisation properties. Experimental results show that the printed cylindrical slot antenna has a 3 dB beamwidth of 120° and a front-back ratio >15 dB View full abstract»

• ### Design concept for singlemode polymer waveguides

Publication Year: 1996, Page(s):212 - 213
Cited by:  Papers (22)
| | PDF (256 KB)

A novel waveguide concept is presented, which is applicable to a multitude of optical polymers. It allows for singlemode single polymer waveguides with large cross-sections, despite considerable index differences between core and cladding layers. Results of waveguides fabricated from a commercially available, high temperature stable polymer (Tg>350°C) are presented, indicating lo... View full abstract»

• ### Oxygen sensing using single frequency GaAs-AlGaAs DFB laser diodes and VCSELs

Publication Year: 1996, Page(s):219 - 221
Cited by:  Papers (3)  |  Patents (1)
| | PDF (328 KB)

Oxygen detection using a GaAs-AlGaAs distributed feedback laser diode emitting at a wavelength of 761 nm is demonstrated for the first time. Using wavelength modulation spectroscopy with harmonic detection the authors have achieved a detection limit of 20 ppm.m with a lock-in amplifier time constant of 33.3 ms. The first results comparing the relative merits of VCSELs and DFB laser diodes for sens... View full abstract»

• ### Using phase-plane plots to assess glottal inverse filtering

Publication Year: 1996, Page(s):192 - 193
Cited by:  Papers (1)
| | PDF (188 KB)

The problem of a subjective, as against an objective, analysis of glottal waveforms obtained through inverse filtering of the acoustic waveform is discussed. It is shown that a dynamical system phase-plane plot can be used to view the residual resonance characteristics and hence assess the quality of the glottal waveform View full abstract»

• ### Handover issue in DECT systems

Publication Year: 1996, Page(s):174 - 175
Cited by:  Papers (1)
| | PDF (240 KB)

The effect of DECT handover procedure on capacity is investigated when both voice and data services are provided. Simulation results show that, by relaxing a constraint in that procedure, the network is less stressed by external handover attempts, thus providing a larger cell throughput View full abstract»

• ### Space-time joint processing method for simultaneous clutter and jamming rejection in airborne radar

Publication Year: 1996, Page(s):258 - 259
Cited by:  Papers (8)
| | PDF (224 KB)

A new method for simultaneous clutter and jamming rejection in airborne radar is proposed. This shows better performance than other suboptimal methods, and its computational and sampling requirements are also significantly reduced compared with the optimal and some suboptimal methods. An obvious property is that the new method possesses good performance in the Doppler frequency bins against the ma... View full abstract»

• ### Adaptive propagation modelling using a hybrid neural network technique

Publication Year: 1996, Page(s):162 - 164
Cited by:  Papers (4)
| | PDF (320 KB)

A hybrid modelling approach for the prediction of terrestrial wave propagation is introduced. It is shown that the use of neural networks leads to highly adaptive models by the simultaneous representation of nonlinear dependencies of various environmental parameters. This flexible and computationally effective approach can be used for calibration and as an extension of conventional prediction mode... View full abstract»

• ### Circularly polarised higher-order rectangular dielectric-resonator antenna

Publication Year: 1996, Page(s):150 - 151
Cited by:  Papers (26)  |  Patents (1)
| | PDF (236 KB)

A circularly polarised, rectangular, low-profile, dielectric-resonator antenna is presented which is fed by a 50Ω microstrip line through a single aperture. The measured 3dB axial-ratio bandwidth in the boresight direction is 14.35-14.80 GHz (3%). At 14.75 GHz, the input |s11| is -28 dB; the measured pattern in one elevation plane decreases with increasing θ but the axial ra... View full abstract»

Publication Year: 1996, Page(s):188 - 190
Cited by:  Papers (20)
| | PDF (332 KB)

The author presents a new type of DS-CDMA receiver: the radial basis function (RBF) receiver. We compare this new receiver with traditional receiver structures such as the matched filter and minimum mean square error (MMSE) receiver. Simulation results show that the RBF receiver gives superior BER performance in Gaussian noise and dispersive channels compared to the traditional receiver structures... View full abstract»

• ### Asymmetric Fabry-Perot modulator with a waveguide geometry

Publication Year: 1996, Page(s):210 - 212
Cited by:  Patents (16)
| | PDF (376 KB)

Modulation characteristics of a dual waveguide structure consisting of a polymer ridge waveguide coupled to semiconductor resonator containing quantum wells are described. The intensity of light transiting the polymer waveguide is modulated when the absorption of the quantum wells is varied by the Stark effect. Intensity modulation occurs since increased absorption broadens the resonance. A 2 V ch... 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.

Full Aims & Scope

## Meet Our Editors

Editors-in-Chief

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

Professor Ian White