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# Electronics Letters

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Displaying Results 1 - 25 of 62
• ### Voice and data services in power utilities using a TETRA system

Publication Year: 1996, Page(s):1176 - 1178
| | PDF (360 KB)

Private land mobile communications have experienced significant demand for increased capacity and for new services, but congestion within the currently allocated 150 and 450 MHz bands has severely limited the capability of present generation systems to meet this demand. The authors show the use of a transEuropean trunked radio system (TETRA) standard to provide a telecontrol service for a medium s... View full abstract»

• ### TDMA based adaptive modulation with dynamic channel assignment (AMDCA) for large capacity voice transmission in microcellular systems

Publication Year: 1996, Page(s):1175 - 1176
Cited by:  Papers (1)  |  Patents (3)
| | PDF (264 KB)

The authors propose an adaptive modulation with dynamic channel assignment (AMDCA) to achieve high capacity voice transmission in microcellular systems. The proposed system measures the received carrier-to-noise plus interference power ratio (C/(N+I)) of each time division multiple access (TDMA) slot to search for available slots and to discover the optimum modulation parameters for each slot, the... View full abstract»

• ### Synchronisation detection in an M-ary PSK system with a rate-selectable punctured convolutional code

Publication Year: 1996, Page(s):1173 - 1175
| | PDF (344 KB)

The authors propose an efficient algorithm for detecting synchronisation in a Viterbi decoder. By monitoring the back-traceability' between two trellis states with the minimum metric at adjacent time units, over a specified span, the proposed algorithm can efficiently detect synchronisation. Experimental results confirm the efficiency of the proposed algorithm View full abstract»

• ### Resynchronising delay-locked loop

Publication Year: 1996, Page(s):1172 - 1173
| | PDF (220 KB)

The delay-locked loop (DLL) is a device that is often used for PN-code tracking to synchronise direct sequence spread spectrum (DS-SS) systems. A DLL with resynchronising capability, which is more robust against loss of lock, is presented. The new scheme has two modes: a normal tracking mode and a resynchronising mode. The structure of the new loop and its function are described View full abstract»

• ### Performance of component interleaved signal sets for fading channels

Publication Year: 1996, Page(s):1170 - 1172
Cited by:  Papers (22)
| | PDF (324 KB)

The authors calculate the exact (pairwise) error probability for an arbitrary component-interleaved 2-D constellation over the Rayleigh fading channel. Using this result, they improve the accuracy of the performance analysis at high error rates. For illustration, this is applied to signal sets derived from 4-PSK and 16-QAM over the Rayleigh fading channel View full abstract»

• ### Parallel code acquisition technique for preamble search in the CDMA reverse link

Publication Year: 1996, Page(s):1169 - 1170
Cited by:  Papers (2)  |  Patents (4)
| | PDF (228 KB)

A parallel PN code acquisition technique for slotted-mode preamble search in a CDMA reverse link is presented. For received PN codes with different signal-to-noise ratios (SNRs), this scheme provides a sub-optimal threshold value such that the mean acquisition time is minimised View full abstract»

• ### Demonstration of 80 Gbit/s WDM transmission over 537 km of non-zero dispersion shifted fibre without in-line dispersion management or gain equalisation

Publication Year: 1996, Page(s):1217 - 1218
Cited by:  Papers (2)
| | PDF (248 KB)

The authors have demonstrated 4×20 Gbit/s WDM transmission over 537 km of non-zero dispersion shifted fibre without using in-line techniques for managing the fibre dispersion or amplifier gain equalisation. The sensitivity of all channels for a BER of 10-9 was between -27.9 and -27.2 dBm (231-1 PRBS) View full abstract»

• ### Optimisation of switching levels for adaptive modulation in slow Rayleigh fading

Publication Year: 1996, Page(s):1167 - 1169
Cited by:  Papers (75)
| | PDF (348 KB)

Multi-dimensional minimisation techniques are used to optimise for specific applications, the upper bound bit error rate (BER) and bits per symbol (BPS) performances of adaptive modulation schemes over Rayleigh channels. This is achieved by modifying the switching criteria for selecting the appropriate modulation scheme View full abstract»

• ### All-optical circulating shift register using a semiconductor optical amplifier in a fibre loop mirror

Publication Year: 1996, Page(s):1215 - 1216
Cited by:  Papers (14)  |  Patents (1)
| | PDF (408 KB)

The authors experimentally demonstrate an all-optical circulating shift register in which the nonlinear element is a semiconductor optical amplifier. This device shows the potential for low latency, high speed, low power all-optical processing View full abstract»

• ### Loss performance of tagged and normal ATM cells at a partially shared buffer

Publication Year: 1996, Page(s):1166 - 1167
| | PDF (200 KB)

The loss performance of tagged and normal ATM cells at a first-in-first-out (FIFO) buffer is studied. The authors show that if a partial buffer sharing mechanism is adopted the loss probability of normal cells can be firmly guaranteed, regardless of the traffic intensity of tagged cells View full abstract»

• ### Block-matching criterion for efficient VLSI implementation of motion estimation

Publication Year: 1996, Page(s):1184 - 1185
Cited by:  Papers (9)
| | PDF (412 KB)

A new block-matching motion estimation criterion is presented, which can be implemented in VLSI more efficiently than the conventional criterion. The proposed scheme can reduce the amount of hardware required and increase the speed of computation in a VLSI chip with acceptable video performance. Video performance and VLSI implementation using the proposed criterion are presented View full abstract»

• ### Simple technique for apodising chirped and unchirped fibre Bragg gratings

Publication Year: 1996, Page(s):1226 - 1228
Cited by:  Papers (12)  |  Patents (5)
| | PDF (432 KB)

For the first time, a simple technique is reported for apodising chirped or unchirped gratings of arbitrary length. Also reported for the first time is the fabrication and measurement of unapodised and apodised 100 mm long, step-chirped fibre gratings with a dispersion parameter of ~1.6 ns-nm-1 and a bandwidth of up to 0.75 nm. It is shown that long chirped gratings may be fabricated at... View full abstract»

• ### Microscopic linear Hall probe arrays

Publication Year: 1996, Page(s):1236 - 1237
| | PDF (356 KB)

A linear Hall probe array, with an active area of 2×2 μm 2 and a 4 μm centre-to-centre separation is presented. Electronics were developed to eliminate residual voltages up to 80 mV at bias current 2 mA. The Hall array exhibited linear dependences (better than 0.1%) of the Hall voltage against magnetic field ±0.1 T at 300 K for pulse bias current 2 mA View full abstract»

• ### Prediction of TDDB characteristics under constant current stresses [gate oxides]

Publication Year: 1996, Page(s):1241 - 1242
Cited by:  Papers (1)
| | PDF (216 KB)

A new breakdown model for gate oxides under constant current stresses is proposed, which directly relates the oxide lifetime to the stress current density and includes the statistical nature of oxide breakdown using the effective oxide thickness. It is shown that this model can reliably predict the TDDB of oxides for any current stress levels and oxide areas View full abstract»

• ### All-optical bit pattern generation and matching

Publication Year: 1996, Page(s):1214 - 1215
Cited by:  Papers (26)  |  Patents (5)
| | PDF (236 KB)

All-optical bit pattern generation and matching is demonstrated at 10 Gbit/s. Bit patterns are generated from noise in a fibre loop memory and are matched in an all-optical exclusive OR (XOR) gate. The XOR gate is implemented in a nonlinear optical loop mirror. This is the first demonstration of an all-optical code matching circuit using an optical loop memory as a high rate pattern generator. Suc... View full abstract»

• ### Jitter and error performance analysis of trellis coded M-PSK over partial response fading channels

Publication Year: 1996, Page(s):1164 - 1166
| | PDF (308 KB)

For the first time, a partial response fading channel is introduced. The new channel model acts in a similar way to partial response signalling (PRS) with a Rayleigh probability density function. Emphasis is given to jitter and error performances of M-PSK schemes in the proposed channel with ideal channel state information, but with no side information existing on the phase noise process. Analytic... View full abstract»

• ### Modified stability approach for higher-order s-to-z mapping functions

Publication Year: 1996, Page(s):1182 - 1183
| | PDF (196 KB)

A modified stability approach for higher-order s-to-z mapping functions is proposed. Its application is demonstrated on two continuous-time filter examples with poles lying near the jω-axis View full abstract»

• ### Multiplexed demodulation of quasi-static measurands without a receiving interferometer

Publication Year: 1996, Page(s):1225 - 1226
| | PDF (252 KB)

The classical technique of dual wavelength interferometry is used to determine the absolute OPD of very short cavities using a parametric plot of the relative interferometric intensities. A network of eight sensors is demonstrated with phase resolution of 1.5 mrad corresponding to 0.2 nm with an unambiguous range of 114 μm View full abstract»

• ### Radar cross-section computations using the parabolic equation method

Publication Year: 1996, Page(s):1234 - 1236
Cited by:  Papers (10)
| | PDF (596 KB)

Two-way parabolic equation (PE) techniques are used to compute the radar cross-section of two-dimensional objects. A finite-difference implementation of a wide angle PE in combination with non-local boundary conditions allows fast execution times on a desktop computer. The technique is applied to scattering by a cylinder and by an idealised aircraft shape. Numerical results are in good agreement w... View full abstract»

• ### MMIC vector modulator for a crossbar BFN

Publication Year: 1996, Page(s):1210 - 1211
Cited by:  Papers (1)
| | PDF (244 KB)

A 1.4-2.7 GHz monolithic vector modulator with continuous amplitude and phase control has been developed. Each state within a full 360° phase range and a dynamic range >15 dB is generated by combining two of three vectors which have variable amplitude and 120° apart. The control in amplitude for the three vectors is performed by sets of two MESFETs working as dual-gate MESFETs, and the ... View full abstract»

• ### Iterative decoding of serially concatenated convolutional codes

Publication Year: 1996, Page(s):1186 - 1188
Cited by:  Papers (48)  |  Patents (21)
| | PDF (504 KB)

Serial concatenation of convolutional codes separated by an interleaver has recently been shown, through the use of upper bounds to the maximum likelihood performance, to be competitive with parallel concatenated coding schemes known in the literature as turbo codes'. The most important feature of turbo codes is their relatively simple, yet high performance, iterative decoding algorithm. The auth... View full abstract»

• ### Performance comparison analysis of GeSi and Si bipolar transistors

Publication Year: 1996, Page(s):1239 - 1241
Cited by:  Papers (1)
| | PDF (348 KB)

Performance improvements of Si/GexSi1-x/Si heterojunction bipolar transistors with linearly graded Ge profile in the epitaxial base layer are compared with Si transistors without Ge by using a combined DC and low-frequency (1 kHz) small-signal AC measurements. Quantitative analysis of the minority-carrier transport parameters in the GeSi base layer, and of the current gain an... View full abstract»

• ### 8×16 delivery-and-coupling type optical switches for a 320 Gbit/s throughput optical path cross-connect system

Publication Year: 1996, Page(s):1213 - 1214
Cited by:  Papers (1)  |  Patents (1)
| | PDF (260 KB)

Four sets of 8×16 delivery-and-coupling type optical switches for a 320 Gbit/s throughput optical path cross-connect system were developed using planar-lightwave-circuit technologies. An average ON/OFF ratio of 42.1 dB was achieved View full abstract»

• ### Frame decorrelation for noise-robust speech recognition

Publication Year: 1996, Page(s):1163 - 1164
Cited by:  Papers (1)
| | PDF (228 KB)

The authors propose a frame decorrelation method to cope with background noise in speech recognition. Since noise is modelled as a stationary perturbation in most cases, it is effective in reducing slow-varying components. One example of using this principle is the highpass scheme. The proposed method has the same property as the highpass scheme. It transforms feature vector sequences into decorre... View full abstract»

• ### Data partitioning in parametric harmonic analysis

Publication Year: 1996, Page(s):1160 - 1161
| | PDF (244 KB)

The key feature of the advance in parametric harmonic analysis reported that of partitioning the data series into a training set and a test set. Test errors are monitored in successive training error minimisations. The analysis procedure achieves high resolution between frequency components, and minimises the data window required in harmonic analysis 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