Wyniki 1-3 spośród 3 dla zapytania: authorDesc:"Muhammad USMAN"

Design Estimations and Channel Capacity Calculations for Spatial, Polarized MIMO Antenna System for Mobile Applications DOI:10.15199/48.2016.06.31

Czytaj za darmo! »

Mobile MIMO (Multiple Input Multiple Output) communications provides an improved transmission capacity and error performance over traditional digital transmission systems. In this paper the spatial, polarization technique is used in order to improve the channel capacity of the proposed system. The potential for integrating MIMO systems comprising both 22 and 33 elements into a mobile handset environment will be considered. The MIMO channels will be subject to Rayleigh fading, and the results are compared against linear (or planar) arrays. In addition, different azimuthal spectra will be considered in evaluating the actual system performance. Streszczenie. W artykule opisano wykorzystanie techniki przestrzennej polaryzacji anteny w celu poprawy pojemności systemu przesyłowego MIMO. System składa się z dwóch 2x2 i 3x3 elementów przystosowanych do odbiorników przenośnych. Projektowanie i obliczanie pojemności kanałów w przestrzennym spolaryzowanym systemie anten MIMO w zastosowaniu do urządzeń przenośnych Keywords: MIMO, Channel Capacity, Polarization, Rayleigh Fading Channel. Słowa kluczowe: system MIMO, antena, polaryzacja, pojemność kanału Introduction Multiple Input Multiple Output communication systems are able to provide an increased data rate, with consequently improved error performance as compared to systems without multiple antennas [1-4]. For antenna systems a particular area of interest is the practical utilisation of multi-path propagation [5, 7]. During the propagation of signals from the transmitter side, these transmitted signals reflected from intermediate objects which cause these signals to travel along separate paths with different time of arrival at the receiver end. These effects combined with digital beam-forming enhance the potential for greater system capability and bandwidth. In order to realize this potential it is necessary to understand how the use of spatial correlation based on polarizatio[...]

Novel Knitted Switches for Smart Clothing Using Single and Double Electrodes Technology DOI:10.15199/48.2016.04.38

Czytaj za darmo! »

This paper presents non mechanical knitted switches. This type of switches was developed for the first time at WLIC, University of Manchester, UK. The switches are operating with single electrode and double electrodes. The switches are designed to work with finger without glove and with glove. Double electrode switch is working based on it impedance characteristics, open circuit and when it has been touched by bare finger or finger with glove. Streszczenie. W artykule zaprezentowano nie-mechaniczne przełączniki dziewiarskie. Tego typu przełączniki zostały opracowane w WLIC, University of Manchester. Przełączniki pracują pod wpływem palców zarówno w rękawiczkach jak i bez. Przełączniki bazują na zmianie impedancji. Pod wpływem dotkniecia palcem. Nowe przełączniki dziewiarskie przeznaczone do inteligentnych ubrań Key Words: Technical Textiles, Wearable Computers, Smart Fabric, Sensor, Transducers. Słowa kluczowe: przełączniki dziwiarskie, inteligentne ubrania Introduction Technical textiles have been very popular among the researchers recently. Apart from traditional knitted textiles during knitting process innovative techniques have been adapted to make it electrically active [1-4]. Several other methods have recently been developed and reported. Some of these include development of special yarns [5] so that the yarn itself acts as a light emitting source. Others make use of specially manufactured yarns in different configuration during knitting process. This gives rise to its use in specialised applications [6]. Research carried out at William Lee Innovation Centre (WLIC) has led to the development of fibre meshed (knitted) transducers from electroconductive polymeric, metal and smart fibres that will behave as transducers. The transducer research at the WLIC has led to the development of knitted flexible switches, the “K switch" TM [7-10]. These two parallel courses act as a capacitor, the resistance is reduced to a virtua[...]

Design of Compact Ultra-Wideband Monopole Semi-Circular Patch Antenna for 5G wireless communication networks DOI:10.15199/48.2019.04.42

Czytaj za darmo! »

The massive mobile data requirement has increased, in last ten years, mainly due to the video content. This is due to the capability of mobile handsets supporting 4k resolution which requires the data rate of 15.4Mbps[1]. This increase is due to the increasing number of user and viewing time. This will result in an annual traffic of 296.8 excabytes(EB) by 2019[2]. Therefore, 5G communication network (IMT 2020) is the suggested solution to match this high data demand, with a capability of reaching up to data rate of 20Gbps. 5G is not only targeting enhanced mobile broadband (eMBB), but also it has diverse usage scenarios including, ultra reliable and low latency communication (URLLC) and massive machine type communication(mMTC). In order to meet with the design challenges of 5G , frontend antenna layout for base stations and mobile hand set is an intense area of research. Recently, technology of ultra-wideband has received high importance and growth in wireless communication systems due to its remarkable features. Federal Communication Commission (FCC) has allocated a frequency band ranging from 3.1 GHz to 10.6 GHz for such applications [3-8]. These systems are characterized by extreme high data rates over their wide bandwidth, low power consumptions [9-12]. Hence, designing a compact antenna with high performance in terms of operating frequency, radiation pattern, power gain, and fabrication cost remains a challenging task[13-17]. Micro strip patch antennas are widely used in ultrawideband systems due to their advantages such as low cost, simplicity, light weight, and structure size. Thus, proposed antenna is a patch semi-circular antenna fed by a micro strip line as shown in figure 1(a). Next section will present details of the antenna structure and parameters. Antenna Design Fig.1 shows the geometry structure of the proposed semi-circular monopole antenna. The entire design and parametric optimization process have been[...]

 Strona 1