The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Recently, many literatures were presented to mitigate the noises or to suppress inter-symbol interference (ISI) and inter-frame interference (IFI) with systems operate in time hopping spread spectrum. The structure of the conventional rake-receiver is more complex that based on large number of multiple paths in wireless ultra wideband (UWB) communication systems. In this paper we proposed low complexity...
The radiation pattern of an adaptive array antenna can be optimised by manipulating the amplitude and phase excitation of the array elements. In this paper, different adaptive beamforming algorithms including minimum Mean-Square Error (MSE), power minimisation and maximum Signal to Interference-plus-Noise Ratio (SINR), are compared and discussed. The algorithms are applied to a 3-faceted adaptive...
In this paper, an over-sampling inverse discrete multiwavelet transform (IDMWT) is suggested as a modulator strategy instead of inverse fast Fourier transform (IFFT) in the realization of the multicarrier code division multiple access (MC-CDMA) system. The suggested strategy was applied on the MC-CDMA with additive white Gaussian noise (AWGN) channel, flat fading channel and frequency selective fading...
Modern telecommunication systems require antennas with multiband characteristics and smaller dimensions that support multiple wireless applications. In this paper, a hexagon shaped microstrip patch antenna is presented, that works at 1.8 GHz. Fractal concept is introduced in to the hexagon shape for miniaturization and multiband characteristics. Here David hexagon fractal concept is used to convert...
Recent rapid progress in information and communication technologies has spurred the exponential surge in the demand for unlimited high-speed and ubiquitous broadband wireless access (BWA), resulting in severe congestion of the radio frequency (RF) spectrum and wireless traffic bottleneck. Visible-light communications (VLC) is poised to become a promising BWA candidate to resolve the existing “last...
Device power consumption is a serious design consideration especially for embedded systems. By reducing the power consumption of a particular system, we could effectively prolong the runtime of the system, allowing for longer operational condition of a particular system. Previous studies have suggested that the power characteristics of a modern embedded processor have since been improved with manufacturer's...
Heart monitoring system is a device to carry out electrocardiogram (ECG) test. It can diagnose human's heart either in normal or abnormal condition based on ECG analysis. However, most of the current ECG device is bulky, expensive and lack of a user-friendly graphical user interface (GUI) for user interaction. This paper describes an on-board GUI design based on capacitive touch-screen Liquid Crystal...
Arrhythmia is a heart disease where the heart rate is inconsistent. For some arrhythmias that can cause sudden cardiac arrest, the patient needs to be sent to the hospital for immediate treatment. Most of the current electrocardiogram (ECG) devices are bulky, cost expensive, and does not include the self-classification or interpretation ability. Hence it is not suitable for small clinics and patients...
The purpose of indoor mobile robot navigation is to travel the mobile robot toward stable-target in a predefined straight line navigation. The movement information of the two-wheeled mobile robot is used as an input to the fuzzy membership function and the outputted probability from the membership function is used to move the robot towards target. The experimental results show that the proposed fuzzy...
Indoor air quality is a rising issue these days. People are becoming are of the importance of indoor air quality. This paper further advances the technology for indoor air quality surveillance by adding an index feature to it. The index feature, accompanied with real-time monitoring system is very useful in giving the real-time alert to the users on the conditions of the current indoor air quality...
Data replication is an increasingly important topic as databases are more and more deployed over distributed systems, grid community and clustering systems. The performance, reliability and portability of entire database may possible by using replication technique. Replication may be considered as a data backup policy. Replication in homogeneous system is common practice in real life, but replication...
In this paper, a hybrid framework of compressed and encrypted video signal transmission over wireless channel has been designed and implemented. Chaos theory property has been combined with artificial neural network to construct a cipher algorithm called a Chaotic Neural Network (CNN). This algorithm has been embedded and integrated inside MPEG-2 video codec standard to transform the plaintext (compressed...
Software driven solutions are limited to the amount of memory size and storage capacity, but the sizes of databases are increasing every day. Hence, now a day, handling data and accessing it in an acceptable time is one of the biggest challenges especially in a large database system. In a database, the records can be categorized according to the access frequencies; some records are very frequently...
The work in this paper is dedicated to present and experiment a fully automatic face recognition approach based on exploiting the distinctive traits of 3D facial scans. We aim to present a recognition approach operates with fully and partial facial scans (missing facial parts). A region based approach for registration and recognition processes is adopted to offer robust faces matching against facial...
This paper studies the impact of impedance discontinuity or mismatch contributed by surface mount (SMT) pads of AC coupling capacitor on Printed Circuit Board (PCB) traces with 26 Giga-bit per second (Gbps) transmission and the technique to minimize its adverse effect, which in turn mitigates the degradation of signal integrity. The design is optimized by the insertion of a cut-out on the reference...
Gate-all-around structure with III-V channel material shows improved channel performance with high carrier mobility and less short channel effect and therefore is being studied rigorously for next generation transistors. We propose an analytical model to calculate gate capacitance and drain current of gate-all-around (GAA) nanowire MOSFET, a prospective device to replace the state-of-art FinFET in...
A growing number of smart energy meters and electric charging stations have sparked a demand for a high precision, low value shunt resistors to measure the flow of electrical current. This paper investigates the possibility of trimming 100 micro ohms Manganin shunt resistors with tolerance of 5 percent to improve their accuracy and performance for use in smart energy meters. In theory, reducing the...
This paper presents a novel LTSPICE based Phase Change Memory (PCM) cell emulator model, using only off the shelf discrete electronic components. The electrical based model simulates not only the continuous resistance change (as corresponding to amorphous and crystalline phases), but also the temperature profile across the cell during programming, while assessing the impact of the programming time...
This paper presents a new methodology of modeling multiplexers (MUXs), power switches and charging modules used in the USB2 interfaces. The proposed method yields a quick and accurate representation in both the time and frequency domains which closely matches the results obtained in both simulation and post-silicon measurement. This will be proven in 2 characterization methods; a time-domain channel...
Due to the openness of the wireless communication, security aspect of data transmission plays important role in respect to the effective measure of the transmission, where cryptography method is often implemented to sustain the security of the communication. A secure communication program is proposed in this paper which involves three design stages, i.e. the encryption technique, serial-transmission...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.