By Topic

Electronics Letters

Filter Results

Displaying Results 1 - 25 of 61
• Gradual RELAX algorithm for RFI suppression in UWB-SAR

Publication Year: 1999, Page(s):1916 - 1917
Cited by:  Papers (4)  |  Patents (2)
| | PDF (200 KB)

Parametric methods of radio frequency interference (RFI) suppression in ultra-wideband synthetic aperture radar (UWB-SAR) often outperform their non-parametric counterparts at the expense of computational complexity. The authors present a parametric algorithm that gradually applies the RELAX algorithm and results in greatly improved computational efficiency and stability View full abstract»

Publication Year: 1999, Page(s):1937 - 1938
Cited by:  Papers (3)  |  Patents (1)
| | PDF (244 KB)

The weaknesses of the password-based protocol for downloading a private key presented by Perlman and Kaufman at NDSS'99 are discussed View full abstract»

• Integrated optical polarisation analyser on planar lightwave circuit

Publication Year: 1999, Page(s):1948 - 1949
Cited by:  Papers (3)  |  Patents (3)
| | PDF (204 KB)

The authors report an integrated optical polarisation analyser fabricated in a silica waveguide on silicon, which consists of a waveguide-type polarisation beam splitter and an integrated optic 120° hybrid. This is a compact and stable polarisation analyser that does not use any bulk optic components. Polarisation measurement was performed successfully with the fabricated analyser View full abstract»

• FIRM: high-speed distributed scheduling for ATM switches with multiple input queues

Publication Year: 1999, Page(s):1915 - 1916
Cited by:  Papers (3)
| | PDF (232 KB)

A new distributed scheduling algorithm for advanced input queueing switch architectures called FIRM is introduced. FIRM provides improved performance characteristics at high load compared to the most efficient alternative, improved fairness, and tighter service guarantees View full abstract»

• On-chip matched 5.2 and 5.8 GHz differential LNAs fabricated using 0.35 μm CMOS technology

Publication Year: 1999, Page(s):1899 - 1900
Cited by:  Papers (14)  |  Patents (2)
| | PDF (220 KB)

The authors have designed experimental 5.2 and 5.8 GHz low-noise amplifiers (LNAs) using 0.35 μm CMOS technology. The ICs feature on-chip matching to 50 Ω, differential operation, and open drain output buffers. A return loss of better than -15 dB was achieved for both amplifiers. LC parallel resonant loads were used to form the gain peak. The LNAs had a measured noise figure of 4 to 5 dB,... View full abstract»

• Supervised texture segmentation using support vector machines

Publication Year: 1999, Page(s):1935 - 1937
Cited by:  Papers (10)
| | PDF (368 KB)

An approach to the problem of supervised texture segmentation using nonlinear support vector machines (SVMs) is presented. For each texture class a nonlinear SVM is constructed which separates that class from the other classes. The segmentation then works by applying all the SVMs to an input image and arbitrating between the SVM outputs. Experimental results show the effectiveness of the proposed ... View full abstract»

• Easily compensated CMOS voltage buffer

Publication Year: 1999, Page(s):1947 - 1948
| | PDF (216 KB)

A frequency compensated 5 V CMOS voltage buffer is proposed. It is possible to increase the bandwidth of the buffer substantially using only one grounded capacitor which introduces a zero into the small-signal transfer function. Simulations based on a 2 μm n-well CMOS process have indicated that the 3 dB frequency of the buffer is beyond 700 MHz View full abstract»

• Array address translation for SDRAM-based video processing applications

Publication Year: 1999, Page(s):1929 - 1931
Cited by:  Papers (8)
| | PDF (352 KB)

To increase the memory bandwidth of SDRAM (synchronous DRAM) that is commonly employed as external memory in video applications such as MPEG2, a memory address translation method is proposed for minimising the number of overhead cycles needed for row-activations and precharges. The features of SDRAM and the characteristics of memory accesses in video processing applications are considered to find ... View full abstract»

• Fast adaptive filtering algorithm based on exponentially weighted least-square errors

Publication Year: 1999, Page(s):1913 - 1915
Cited by:  Papers (8)
| | PDF (316 KB)

The linearly filtered gradient least mean square algorithm is reformulated using exponentially weighted least-square errors, and a partially filtered gradient LMS algorithm is proposed as a variant. It is shown that the proposed algorithm is superior in terms of convergence and tracking capability compared to the LMS and FGLMS algorithms View full abstract»

• FDTD modelling of nonlinear spark in electrostatic discharge

Publication Year: 1999, Page(s):1897 - 1898
Cited by:  Papers (4)
| | PDF (200 KB)

An accurate numerical method for calculating nonlinear electrostatic discharges is presented. The method represents an improvement over the FDTD scheme in that it includes the arc model of Rompe and Weizel [1944]. Numerical results that demonstrate the validity and accuracy of the model are presented View full abstract»

• Low-noise amplification under the 3 dB noise figure in high-gain phase-sensitive fibre amplifier

Publication Year: 1999, Page(s):1954 - 1955
Cited by:  Papers (20)
| | PDF (224 KB)

A noise figure which is less than the standard quantum limit of 3 dB has been observed for the first time in a high gain phase-sensitive fibre parametric amplifier. A noise figure of 1.8 dB with a 16 dB signal gain was measured by a precisely calibrated electrical spectrum analyser View full abstract»

• Identification scheme based on Shamir's RSA for paranoids'

Publication Year: 1999, Page(s):1941 - 1942
| | PDF (264 KB)

In 1995, Shamir proposed a variant of the RSA cryptosystem that allows for the use of large moduli while keeping computing requirements substantially lower than those in conventional RSA. An identification scheme based on this cryptosystem is outlined View full abstract»

• Still image compression based on 2D discrete wavelet transform

Publication Year: 1999, Page(s):1934 - 1935
| | PDF (220 KB)

The objective of this Letter is to develop new techniques for enhancing the compression of still images. The features of the proposed algorithm include: (i) zero mapping, which exploits the inherent self-similarity of wavelet coefficients at different scales, (ii) adaptive scanning, and (iii) data packing. Our algorithm outperforms both JPEG and the embedded zerotree wavelet (EZW) algorithm View full abstract»

• Advanced measurement techniques for generation of SPICE models of RFIC packages

Publication Year: 1999, Page(s):1945 - 1946
Cited by:  Papers (5)
| | PDF (204 KB)

An advanced technique based on broadband vector network analyser measurement is proposed to generate the SPICE models for radio-frequency integrated circuit packages. The models can account for various package effects at radio frequencies View full abstract»

• Analytical solution to diffraction problem in series of half-screens bounded by low-curvature surface

Publication Year: 1999, Page(s):1928 - 1929
| | PDF (208 KB)

An analytical solution to the radiowave diffraction problem in a series of half-screens bounded by a low-curvature surface is proposed. The approximate solution is expressed in terms of new special functions. The advantage of this method consists in the significant increase in the speed of computation achieved through preliminary determination of the special functions View full abstract»

• Mechanical' neural learning for blind source separation

Publication Year: 1999, Page(s):1963 - 1964
Cited by:  Papers (3)
| | PDF (220 KB)

A class of learning models derived from the study of the dynamics of an abstract rigid mechanical system is presented. Application to blind source separation is illustrated through computer simulations View full abstract»

• Overclocking of controller area networks

Publication Year: 1999, Page(s):1923 - 1925
Cited by:  Papers (9)  |  Patents (30)
| | PDF (340 KB)

The bus length in controller area networks is seriously limited due to the particular access technique adopted. An overclocking technique is described which consists of increasing the bit rate for selected portions of the frame. In this way, the throughput can be doubled without worsening either the maximum network extension or the responsiveness View full abstract»

• Fade characteristics for K-band land-mobile satellite channels in Tokyo measured using COMETS

Publication Year: 1999, Page(s):1912 - 1913
| | PDF (216 KB)

The K-band fade statistics in Tokyo were measured using an antenna (beamwidth of 19.5° in elevation and 6.5° in azimuth) at elevations ranging from 37 to 80°. The results show that line-of sight communication is possible only ~33% of the distance at elevations <50°, But it is 98% at 80° View full abstract»

• Very low-voltage class AB CMOS and bipolar precision current rectifiers

Publication Year: 1999, Page(s):1904 - 1905
Cited by:  Papers (6)
| | PDF (220 KB)

Simple class-AB CMOS and bipolar precision rectifier circuits that operate from a single supply close to a transistor's threshold voltage are introduced. These circuits have output voltage swings comparable to the supply voltage. Results from simulations of MOS and bipolar precision rectifiers at 20 and 100 MHz, respectively, are presented. Experimental results of a test chip are presented that ve... View full abstract»

• Miniature 1 kW, 95 GHz magnetrons

Publication Year: 1999, Page(s):1960 - 1961
Cited by:  Papers (19)
| | PDF (260 KB)

Miniature spatial-harmonic magnetrons with a cold cathode having 1 kW peak power at 95 GHz are presented. The performance and operating conditions of the magnetrons are discussed and compared with those for classical magnetrons View full abstract»

• Dynamic behaviour of hysteresis chaotic circuit

Publication Year: 1999, Page(s):1896 - 1897
Cited by:  Papers (1)
| | PDF (208 KB)

A re-formulation of the equations governing the dynamics of a hysteresis chaotic circuit is presented. The effects of the removal of a constraint on the circuit parameters are discussed View full abstract»

• High-performance single-frequency fibre Fabry-Perot laser (FFPL) with self-injection locking

Publication Year: 1999, Page(s):1952 - 1954
Cited by:  Papers (5)  |  Patents (2)
| | PDF (340 KB)

The characteristics are presented of a 5 mm long Er3+:Yb3+ fibre Fabry-Perot laser (FFPL) with self-injection locking by a fibre Bragg grating (FBG), and its high performance is demonstrated in a 10 Gbit/s NRZ transmission system. The laser produces a single frequency and single polarisation output, has a high output power exceeding 13 mW, a narrow linewidth of -100 kHz, and ... View full abstract»

• Linear feedback shift registers as vector quantisation codebooks

Publication Year: 1999, Page(s):1919 - 1920
Cited by:  Papers (1)
| | PDF (216 KB)

Linear feedback shift registers with fixed initial conditions can be used as codebooks for vector quantisation data compression methods, avoiding the need to store codebooks at the encoder and decoder. Suboptimal search procedures can be used to effectively search the codebook space with lower complexity, with only modest coding performance penalties View full abstract»

• Design of swap interleaver for turbo codes

Publication Year: 1999, Page(s):1939 - 1940
Cited by:  Papers (2)  |  Patents (2)
| | PDF (212 KB)

A swap interleaver for turbo codes that can be obtained from a classical block interleaver is proposed. By increasing the frame length and s-parameter, the search time required to obtain the swap interleaver can be reduced significantly as compared to the time required for a conventional s-random interleaver View full abstract»

• Neural concurrent subsampling and interpolation for images

Publication Year: 1999, Page(s):1933 - 1934
Cited by:  Papers (2)
| | PDF (200 KB)

A concurrent subsampling and interpolation algorithm for images is presented which uses a feedfoward neural network (FNN), providing the advantages of good image reproduction quality and high speed processing capability. Experimental results show that the proposed technique exhibits an increased performance over conventional methods such as linear- and cubic-based interpolation 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