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# Electronics Letters

## Filter Results

Displaying Results 1 - 25 of 53
• ### Simulation model for performance evaluation of Internet applications using GPRS radio interface

Publication Year: 2001, Page(s):786 - 787
Cited by:  Papers (1)
| | PDF (292 KB)

Since Internet applications such as WWW, FTP and e-mail will work over the GPRS mobile system, it is important to establish how they perform using the GPRS radio interface. Results are presented that show the usefulness of the GPRS radio interface for Internet applications View full abstract»

• ### Technique for target detection and ranging based on broadband LPI radars

Publication Year: 2001, Page(s):784 - 786
Cited by:  Papers (3)
| | PDF (508 KB)

A processing technique for improving the ranging and detection capabilities of LPI radars and the measured performance of an experimental system are presented. The precision of the measured distance is very high even under low SNR conditions. The associated detection algorithm also exhibits good performance in noisy environments View full abstract»

• ### Bistatic scattering behaviour of forested hills at grazing incidence

Publication Year: 2001, Page(s):783 - 784
Cited by:  Papers (1)
| | PDF (340 KB)

Bistatic radar clutter levels from forested hills are presented. Measurements were made using copolarised transmitter and receiver antennas at vertical and horizontal polarisations viewing hilly terrain at depression angles between 0.5 and 2.0°. Observed clutter levels are 10-20 dB higher than similar results obtained at lower depression angles View full abstract»

• ### High-sensitivity 1 Gbit/s CMOS receiver integrated with GaAs- or InGaAs-photodiode by wafer-bonding

Publication Year: 2001, Page(s):781 - 783
Cited by:  Papers (2)  |  Patents (3)
| | PDF (504 KB)

1 Gbit/s III-V/CMOS hybrid receivers consisting of a GaAs- or InGaAs-photodiode and a 0.5 μm CMOS receiver circuit have been realised by wafer-bonding. The circuit is simple and compact with high sensitivity and broad bandwidth due to the direct attachment of III-V PDs and the absence of any parasitic capacitance. Sensitivities of -27.4 and -28.0 dBm at 1 Gbit/s are demonstrated for 0.85 and 1.... View full abstract»

• ### Recursive method for generating weight enumerating functions of trellis codes

Publication Year: 2001, Page(s):773 - 774
Cited by:  Papers (4)
| | PDF (304 KB)

A simple recursive method for generating weight enumerating functions of trellis codes with finite lengths is presented. The proposed technique is conceptually simple and yet computationally efficient. It provides a convenient means for evaluating the performance of turbo-type concatenated codes View full abstract»

• ### Hybrid opto-mechanical gyroscope with injection-interferometer readout

Publication Year: 2001, Page(s):756 - 758
Cited by:  Papers (4)
| | PDF (540 KB)

A hybrid micromachined-optoelectronic mechanical system (MOEMS) gyroscope is proposed. It consists of an electrically excited micro-mechanical resonator and an optical readout performed by a laser diode operating as an injection interferometer. An analysis of the system, validated by preliminary experimental results, indicates an attainable performance of 1 deg/h√Hz View full abstract»

• ### 10 to 110 GHz tunable opto-electronic frequency synthesis using optical frequency comb generator and uni-travelling-carrier photodiode

Publication Year: 2001, Page(s):780 - 781
Cited by:  Papers (12)
| | PDF (284 KB)

Demonstration of tunable opto-electronic synthesis of millimetre-wave signals using an optical frequency comb generator is reported. Millimetre-wave signals from 10 to 110 GHz have been obtained by using a uni-travelling-carrier photodiode. Powers of up to 3 dBm at 60 GHz and small-signal 3 dB (electrical) bandwidths of >85 GHz were obtained without the use of any electrical amplification View full abstract»

• ### InP 2D photonic crystal microlasers on silicon wafer: room temperature operation at 1.55 μm

Publication Year: 2001, Page(s):764 - 766
Cited by:  Papers (19)  |  Patents (6)
| | PDF (328 KB)

Room temperature pulsed laser operation of 2D photonic crystal microcavities around 1.55 μm is reported. Such devices are based on thin III/V heterostructures transferred onto silicon and include an InGaAs/InP multiquantum well (MQW) active layer View full abstract»

• ### Maximum likelihood decoding bounds for high rate turbo codes over Lorentzian channels

Publication Year: 2001, Page(s):771 - 773
Cited by:  Papers (3)
| | PDF (412 KB)

Performance bounds are developed on the bit error probability of turbo codes over a Lorentzian channel, which is a realistic magnetic recording channel model. It is assumed that maximum likelihood decoding and uniform interleaving are employed. The results are applicable to linear codes over ISI channels View full abstract»

• ### Design and finite element analysis of weighted-stiffness microelectromechanical digital-to-analogue converters

Publication Year: 2001, Page(s):755 - 756
Cited by:  Papers (2)
| | PDF (284 KB)

A microelectromechanical digital-to-analogue converter (DAC) based on the weighted-stiffness (WS) principle analogous to a weighted-resistor DAC for use in electronic circuits is proposed. To convert the digital voltage input to the analogue displacement, the stiffness of the vertical beams is employed as the scale factor. Finite element analysis and design optimisation are performed. Simulation s... View full abstract»

Publication Year: 2001, Page(s):778 - 780
Cited by:  Papers (15)  |  Patents (2)
| | PDF (508 KB)

The authors demonstrate a free-space optical data link over 350 m using a Peltier-cooled 9.3 μm quantum cascade laser operating at a duty cycle of almost 50%. On the emitter side, a Ge lens was used for beam collimation and a flat mirror for beam steering, while on the receiver side, a fast room-temperature HgCdTe detector in combination with a φ=16 cm mirror telescope detected the incoming... View full abstract»

• ### 100 GHz optical pulse generation using Fabry-Perot laser under continuous wave operation

Publication Year: 2001, Page(s):763 - 764
Cited by:  Papers (21)
| | PDF (304 KB)

Optical pulse generation at 100 GHz using a 1.5 μm Fabry-Perot laser is experimentally demonstrated under continuous wave operation. Although the output from the laser is almost constant, sub-picosecond short pulses at 100 GHz are obtained after propagation through a singlemode fibre. The measured radiofrequency spectrum confirms that the Fabry-Perot laser is passively modelocked View full abstract»

• ### Increasing throughput of iterative decoders

Publication Year: 2001, Page(s):770 - 771
Cited by:  Papers (6)  |  Patents (8)
| | PDF (296 KB)

Decoding concatenated codes with an iterative decoder including a stopping criterion saves power compared to decoding with a fixed number of iterations. In this work the throughput of the decoder is also increased. This is achieved by using additional buffers at the decoder input and a modified stopping criterion. Simulations demonstrate that this method can double the throughput compared to the c... View full abstract»

• ### Vertex adjustment method using geometric constraint for polygon-based shape coding

Publication Year: 2001, Page(s):754 - 755
Cited by:  Papers (1)
| | PDF (296 KB)

A new vertex selection scheme for polygon-based contour coding is proposed. The proposed method consists of two-step procedure'. Initial vertices are selected by using the conventional iterated refinement method (IRM) or progressive vertex selection (PVS) method. A vertex adjustment process then follows where the initial vertices are updated to produce an optimal polygon in the sense of error ar... View full abstract»

• ### Errata

Publication Year: 2001, Page(s): 803
| | PDF (92 KB)

First Page of the Article
View full abstract»

• ### Retrodirective array tracking prediction using active element characterisation

Publication Year: 2001, Page(s):727 - 728
Cited by:  Papers (9)
| | PDF (284 KB)

The authors report on the comparison between the measured and predicted monostatic radiation pattern of a four-element retrodirective array (RDA) operating at 1 GHz. Predictions of array performance were carried our using an isolated element approach then an active element approach. Classical modelling of the RDA performance yielded a worst-case amplitude error with respect to measurement of 3.7 d... View full abstract»

• ### High power X-band (8.4 GHz) SiGe/Si heterojunction bipolar transistor

Publication Year: 2001, Page(s):790 - 791
Cited by:  Papers (6)  |  Patents (2)
| | PDF (308 KB)

A high-performance double-mesa type Si/SiGe/Si power HBT at X-band (8.4 GHz) frequency is demonstrated. Under continuous wave operation, a single 20-finger common-base Si/Si0.75Ge0.25/Si (2×10 μm2 of each emitter finger) HBT has an output power of 27.4 dBm and an associated power gain of 7 dB at peak PAE of 32.3%. These parametric values represent the stat... View full abstract»

• ### 8 THz bandwidth dispersion-slope compensator module for multiband 40 Gbit/s WDM transmission systems using an AWG and spatial phase filter

Publication Year: 2001, Page(s):777 - 778
Cited by:  Papers (5)  |  Patents (2)
| | PDF (336 KB)

The authors demonstrate a 2×40-channel dispersion-slope compensator for 40 Gbit/s wavelength-division multiplexing (WDM) transmission systems that employs an arrayed-waveguide grating (AWG) with a 4.0 THz bandwidth and a spatial phase filter. It can compensate for the dispersion slope of the entire bandwidth of C- and L-bands simultaneously View full abstract»

• ### Clear correspondence between theoretical and experimental light propagation characteristics in photonic crystal waveguides

Publication Year: 2001, Page(s):761 - 762
Cited by:  Papers (5)  |  Patents (1)
| | PDF (372 KB)

Single line defect optical waveguides in a photonic crystal airbridge fabricated into a silicon-on-insulator wafer with a minimum propagation loss of 11 dB/mm are demonstrated. The observed propagation loss spectrum and near field patterns at fibre communication wavelengths agree well with those expected from the photonic band calculation View full abstract»

• ### Efficiency improvement of broadband microwave amplifiers using current sharing concept

Publication Year: 2001, Page(s):769 - 770
Cited by:  Papers (1)
| | PDF (288 KB)

The authors present experimental results of a 2 to 18 GHz high-gain dual-stage feedback amplifier employing a novel concept of current sharing that drastically reduces the current consumption by 50% without compromising the amplifier performance and hence produces a more than two-fold improvement in the power-added efficiency View full abstract»

• ### Ultra-wideband microstrip quasi-horn antenna

Publication Year: 2001, Page(s):731 - 732
Cited by:  Papers (11)  |  Patents (3)
| | PDF (296 KB)

The development of a novel ultra-wideband (UWB) antenna is reported. The antenna, based on a microstrip transmission line, forms a quasi-horn and possesses an extremely wide bandwidth of many decades with relatively high gain. It does not require a balun or transition at the input port and is inherently matched. Two such antennas, when used as transmit and receive elements, have a high isolation b... View full abstract»

• ### Temporal characterisation of forgiveness effect

Publication Year: 2001, Page(s):752 - 754
Cited by:  Papers (4)
| | PDF (484 KB)

A subjective quality test was performed to determine the extent to which low level and high level audio-video degradations are forgiven over time. The results show that the forgiveness effect initially greater for high level degradations. However, the forgiveness effect is more prolonged for low level degradations. A new method for calculating the forgiveness effect, based on rate of change in qua... View full abstract»

• ### Low resolution region discriminator for wavelet coding

Publication Year: 2001, Page(s):748 - 749
| | PDF (404 KB)

A wavelet block chain (WBC) method is used in the initial coding of the low-low subband created by a wavelet transform to separate and label homogenous regions of the image which require no additional overhead in the bitstream. This information is then used to enhance the coding performance in a modified wavelet based coder. This method uses a two stage ZTE/SPIHT entropy coder (called a homogenous... View full abstract»

• ### Speech quality and recognition rate improvement in car noise environments

Publication Year: 2001, Page(s):800 - 802
Cited by:  Papers (6)  |  Patents (1)
| | PDF (464 KB)

In car noise environments, speech quality is severely degraded and speech recognition systems fail to produce high recognition rates. Highpass filtering and Kalman filtering with a whitening process are applied to car noise corrupted speech signals and improvement both in speech quality and in speech recognition is achieved View full abstract»

• ### In-service monitor for group-velocity dispersion of optical fibre transmission systems

Publication Year: 2001, Page(s):743 - 745
Cited by:  Papers (16)
| | PDF (460 KB)

A novel technique for in-service monitoring of the group-velocity dispersion (GVD) in optical fibre transmission systems is proposed. In this method, the transmission signal light itself acts as the probe light, and the GVD value at the operating wavelength can be obtained only from the received signal. We demonstrate the GVD monitor in a 9.953 Gbit/s transmission system using the proposed method 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