Results 251 to 260 of about 832,585 (295)

Excimer laser gain by pulse shape analysis

IEEE Journal of Quantum Electronics, 1981
An analysis of the temporal emission of broadband tunable excimer lasers such as Xe 2 Cl shows that the laser pulse can be described in terms of a Q -switch model rather than by steady-state considerations. For electron-beam ( e -beam) pumped rare gas halide mixtures, transient absorption of the majority gas-usually argon-acts as a chemical Q -switch ...
G. Marowsky, M. Munz, F. Tittel
openaire   +1 more source

High gain bat shape antenna for IEEE 802.11a

2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP), 2015
This paper presents a type of Bat shape antenna [1] for the application of IEEE 802.11a (5.15 to 5.875 GHz) WiFi application. The frequency range between 4 to 6 GHz is simulated. The prototype is implemented based on the simulation result. The important parameters, such as reflection coefficient, gain, directivity, overall efficiency, and power gain ...
Dau-Chyrh Chang, Jyun-Hong Su
openaire   +2 more sources

Shape-gain matrix quantizers for LPC speech

IEEE Transactions on Acoustics, Speech, and Signal Processing, 1986
It has been recently demonstrated that the principles of vector quantization for LPC speech can be simply extended to encompass matrices of LPC vectors with significant savings in bit rate. Unfortunately, however, such locally optimal matrix quantizers have prohibitively high complexity and memory requirements when implemented in a speech vocoder at ...
null Chieh Tsao, R. Gray
openaire   +1 more source

Shaping gains using non-equiprobable signaling

[Proceedings] GLOBECOM '90: IEEE Global Telecommunications Conference and Exhibition, 2002
The method presented by A.R. Calderbank and L.H. Ozarow (IEEE Trans. Inform. Theory, vol.36, p.726-40, July 1990) is extended to provide shape gains without resorting to high-dimensional constellations. The extended method accomplishes this by dividing the constellation into unequal sized constellations and then selecting these constellations on an ...
openaire   +1 more source

Beat-Based ECG Compression Using Gain-Shape Vector Quantization

IEEE Transactions on Biomedical Engineering, 2005
An electrocardiogram (ECG) data compression scheme is presented using the gain-shape vector quantization. The proposed approach utilizes the fact that ECG signals generally show redundancy among adjacent heartbeats and adjacent samples. An ECG signal is QRS detected and segmented according to the detected fiducial points.
Chia-Chun, Sun, Shen-Chuan, Tai
openaire   +2 more sources

Maximum antenna gain of shaped beams

Journal of the Franklin Institute, 1961
Abstract Most of the energy radiated by an antenna lies outside the 3-db. contour of the antenna power pattern. The fraction of the total power which is within the region of concern, not necessarily restricted to the 3-db. points, is termed the concentration factor. The maximum antenna gain of narrow shaped beams, such as the cosecant-squared pattern
openaire   +1 more source

Mean-gain-shape vector quantization using counterpropagation networks

Proceedings 1995 Canadian Conference on Electrical and Computer Engineering, 2002
A neural network for the implementation of mean-gain-shape vector quantization is proposed. Mean-gain-shape vector quantization is a product vector quantization consisting of three codebooks. A counterpropagation network (CPN) is used to perform the vector quantizations.
null Jiajun Zhang, M.O. Ahmad, W.E. Lynch   +2 more
openaire   +1 more source

Noise-Shaping Gain-Filtering Techniques for Integrated Receivers

IEEE Journal of Solid-State Circuits, 2009
In this paper, a new technique for realizing area-efficient, low-noise filters is introduced. The proposed filter topologies utilize noise shaping techniques to shift the noise of the passive and active filter components out of the passband of the filter.
Ahmet Tekin, Hassan Elwan, Aly Ismail, Kenneth Pedrotti   +3 more
openaire   +1 more source

EDFA gain shape control for submarine WDM repeaters

IEE Colloquium New Developments in Optical Amplifiers, 1998
High speed long haul optical undersea communication systems have experienced unprecedented fast development in the past few years. This paper discusses the techniques developed at Alcatel Submarine Networks (ASN) Ltd, Greenwich, to accurately measure the gain shape of EDFAs for 8 channel systems, to control the gain shape, and flatten the gain, and ...
D. Willetts, G. Zarris, D. Castelford, G. Lusson, X. Shan, N. Hazell   +5 more
openaire   +1 more source

Perceptually based directional classified gain-shape vector quantization

IEEE Transactions on Circuits and Systems for Video Technology, 1995
A new image coding system, termed directional classified gain-shape vector quantization (DCGSVQ), is introduced in this paper. A content-classifier, operating in the spatial domain, is employed to classify each image block of 8/spl times/8 pixels into one of several classes which represent various image patterns (edges in various directions, monotone ...
A. Kubrick, T.J. Ellis
openaire   +1 more source