Hasil Pencarian  ::  Simpan CSV :: Kembali

"Dalam dunia industri, untuk mengetahui performa mesin motor dapat dilakukan diagnosa menggunakan machinery analyzer. Machinery analyzer yang dibahas pada penelitian ini yaitu Haliza. Terdapat permasalahan dalam melakukan diagnosa mesin motor menggunakan Haliza yaitu penggunaan kabel komunikasi antara sensor kecepatan dan Haliza, yang mengurangi fleksibilitas saat proses diagnosa dilakukan dan waktu pemasangan yang cukup lama. Oleh karena itu, pada penelitian ini akan dilakukan rancang bangun interface untuk modul komunikasi wireless yang akan dipasang pada sensor kecepatan dan Haliza. Rancang bangun interface di kembangkan dengan menggunakan mikrokontroler ATmega16A, sebagai kontroler pada modul wireless RF CC2500. Telah dilakukan pengujian hardware dan software dari modul komunikasi wireless. Dari hasil uji komunikasi diperoleh jangkauan jarak maksimum tanpa BER (Bit Error Rate) sejauh 16 meter pada kecepatan putaran motor 1800 rpm dengan nilai RSSI -79 dBm. Kecepatan putaran motor maksimum yang dapat terukur yaitu 2100 rpm, dengan tingkat kesalahan 0.14% dibandingkan dengan hasil pengukuran tachometer. Untuk uji kehandalan komunikasi wireless, didapatkan tingkat kesalahan rata-rata sebesar 0.09% pada pengujian jarak 10 meter dengan kecepatan 2100 rpm selama 5 jam pengujian.

---

In the industrial, to know the performance of the machine can be diagnosed using machinery analyzer. Machinery analyzer are discussed in this research that Haliza. There are problems in diagnosing the machine using Haliza namely the use of the communication cable between the speed sensor and Haliza, which reduces the flexibility when the diagnosis is made and the installation of a long time. Therefore, in this report will be conducted design interface for a wireless communication module that will be installed on the speed sensor and Haliza. The design of the interface is developed by using microcontroller ATmega16A, as a controller in the wireless module RF CC2500. The hardware and software of the wireless communication module have been tested. Communication test results obtained maximum distances without the BER (Bit Error Rate) as far as 16 meters at a motor rotating speed of 1800 rpm with RSSI value of -79 dBm. The maximum rotation speed of the motor which can be measured at 2100 rpm, with an error rate of 0.14% compared with the measurement results tachometer. The reliability test of wireless communication, obtained average error rate of 0.09% at the testing distance of 10 meters at a speed of 2100 rpm for 5 hours of testing."

"The book presents a comprehensive view of channel degradation arising from fading and shadowing. Various statistical models including simple, hybrid, compound, complex and cascaded ones are presented with detailed derivations along with measures to quantify the deterioration such as the amount of fading, error rates and outage probabilities. The models range from the Rayleigh and Rician through Suzuki, generalized K, cascaded and alpha-mu and similar ones. This is followed by the analysis of mitigation of fading and shadowing through diversity (simple, hybrid, micro- and macro- level) and combining algorithms. The density and distribution functions, error rates and outages are derived and results analyzed to quantify the improvements. The effects of co-channel interference before and after the implementation of diversity are also analyzed. To facilitate easy understanding of the models and analysis, the background information in terms of probability and random variables is presented with relevant derivations of densities of linear and nonlinear transformation of random variables, the sums, products, ratios as well as order statistics of random variables of all types. The book also provides material on digital modems of interest in wireless systems. Thus, the book with 1100+ equations and 350+ Matlab generated figures and tables is an ideal source for students, educators, researchers and professionals in wireless communications allowing access to information currently unavailable."

"Contents : - Contents by Author - University Program Sponsors - Current Trends and Business Strategies - The Progression of WIMAX Toward a Peer-to-Peer Paradigm Shift - Affirming the Mobility Quotient: How Wireless Connectivity Is Shaping Worker Productivity - How Small Can It Get? - Improving the Performance of Mobile Ad Hoc Networks Using Directional Antennas - Whence and Whither Mobile Communications and Impacting Technologies - The Evolution of WiMAX Certification - Prime Time for Mobile Television - Technologies and Networks - WLAN Mesh Architectures and IEEE 802.11s - Wireless Billboard Channels:Vehicle and Infrastructural Support for Advertisement, Discovery, and Association of UCWW Services - Leveraging MIMO in Wide-Area Networks - Revolution by Satellite - Overview of a Personal Network Prototype - Smooth Integration of Mobile Video Telephony to Windows Mobile - The Law of Mobility - Detecting Packet Mishandling in Mobile Ad Hoc Networks - Performance of Transport Protocols in Wireless Networks - The Emergence of the Wireless VoIP Phone - Effect of Interference and Control Error on Cellular Mobile Communication Networks - Seamless Mobility - Optimizing Video over Wireless Using Performance and Architecture Modeling - Internetworking of Next-Generation IPv6-Based Mobile Wireless Networks and MPLS/GMPLS-Based Multiservice Backbone Networks - Acronym Guide "

"Contents : - Introduction and Background - Cellular Communications: The First Decade - Introduction to Personal Communications Services - Wireless: A New World of Possibilities - A Layman's Guide to Cellular - Section I: Business and Marketing Considerations - Wireless Information Networks - The Origins of Cellular Communications - Major Challenges to Wireless Providers - Implementing Smart Cards in the USA: A Wireless Perspective - Domestic Spectrum Regulation in the United States - Cellular/PCS: Complement or Substitute for Wireline Telephony? - Section II: Wireless Technology and Applications - Network Issues for Personal Communications Services - Network Management Systems - PCS Customer Information System Architectures - Rural Cellular - Coding and Modulation: A Tutorial - Coded Modulation Techniques for Cellular Mobile Systems - Introduction to Propagation for Mobile and Portable Radio - Instantaneous Wideband Channel Sounding for 1.7 GHz PCS - Intelligent Antennas: Spatial Division Multiple Access - Biological Effects of Radio Frequency Fields - High-Efficiency DC-DC Converters for Battery-Operated Systems with Energy Management - Interoperability of Satellite and Terrestrial Networks - A Comparative Analysis of Near Earth Satellite Communications Systems - Propagation Effects in Satellite Systems - Section III: Wireless Outside the United States - Wireless Local Loop for Developing Countries - A Technology Perspective - Wireless Communications in Russia - Mobile Communications Industry in Thailand - Evolution of Wireless Applications in Mexico - History of Wireless in Korea and Present Opportunities for Foreign Companies - Cellular and Personal Communications in Europe - Europe, A Crucial Part of Any Global Wireless Strategy - Wireless Systems in Japan and Associated Issues - Section IV: The Future - An Ice Age is Coming to the Wireless World - Cellular Communications: What's Ahead - Acronym Guide - Index "

"Hal yang terutama pada jaringan wireless bergerak adalah kualitas layanan (QoS).Jaringan wireless bergerak ini memiliki topologi yang selalu dinarnis setiap saat.Kemungkinan putusnya koneksi pada jaringan komunikasi yang seperti ini adalah Iebihbesar. Sehingga perlu diperhatikan pertama sekali perutean koneksinya.Pada skripsi ini diberikan suatu bentuk perutean untuk jaringan bergerak ini.Pemecahan masalah yang diberikan bentuk perutean ini adalah pada bagaimanamemulihkan kembali link-link koneksi yang terputus akibat mobilitas node-node. Selainitu perutean ini pun harus mampu meningkatkan kinerja jaringan, yang artinya denganperutean bandwith ini kualitas jaringan yang seperti ini dapat ditingkatkan. Karenamungkin saja untuk menginterkoneksikan jaringan bergerak ini dengan jaringan berkabelyang mengutamakan QoS dalam kinerjanya, seperti ATM ataupun Internet.Dari pengujian-pengujian yang akan dilakukan pada simulator yangmensimulasikan keberadaan jaringan bergerak ini, pengaruh perutean bandwith ini padakinerja jaringan bergerak dapat diketahui. Salah satu kelebihan dari bentuk peruteanbandwith pada simulator adalah adanya kalkulasi informasi bandwith. Ini berguna sekalidalam membantu pembentukan call ataupun koneksi dari suatu node asal ke node tujuan."

"Tugas akhir ini bertujuan untuk membandingkan Bluetooth dan Zigbee dari segi kinerja mereka, apakah mereka adalah pelengkap atau pesaing satu sama lain. Pada penelitian ini, penulis menggunakan metode studi literatur untuk menganalisis kinerja Bluetooth karena sudah banyaknya sumber-sumber mengenai kinerja Bluetooth yang tersedia. Sedangkan untuk menganalisis kinerja Zigbee, penulis menggunakan simulasi dengan Network Simulator versi 2 dan dilengkapi dengan studi literatur. Laporan ini juga dilengkapi dengan rekomendasi area aplikasi bagi Bluetooth dan Zigbee serta ditutup dengan posisi Zigbee dan Bluetooth dalam Wireless Personal Area Network. Adanya standardisasi, hemat tenaga, dan murah mendukung Zigbee menempatkan diri sebagai salah satu teknologi Wireless Personal Area Network yang diperhitungkan. Besar kemungkinan di masa mendatang, konsumer akan merujuk kepada Zigbee sebagaimana sekarang mereka merujuk pada Bluetooth.

---

The focus of this study is to compare the performance of Zigbee and Bluetooth, whether they are complementary or competing technologies. Literature study method is used to analyze the performance of Bluetooth regarding the large amount of available Bluetooth resources. A simulative investigation had been conducted to analyze the performance of Zigbee by using Network Simulator version 2, supported with literature study. This report also includes the application areas of Zigbee and Bluetooth and is concluded by stating the position of Zigbee and Bluetooth in WPAN. Standardization, low power, and low cost have placed Zigbee as a competitive technology. Consumers may someday refer to Zigbee the way they now refer to Bluetooth."

"Sistem catu daya listrik nirkabel dirancang bukan untuk menggantikan seluruh kabel tetapi untuk meningkatkan kehandalan dan kenyamanan pengguna peralatan. Desain rangkaian Transmitter pada sistem tersebut pada dasarnya adalah rangkaian variable comparator oscillator yang terdiri dari Voltage comparator yang berfungsi sebagai pengatur frequensi agar dapat bekerja pada bermacam-macam frekuensi dan rangkaian LC Mosfet digunakan untuk Mengubah Arus searah menjadi Arus Bolak-Balik agar bisa menghasilkan induksi elektromagnetik pada Antena yg merupakan beban induktif.

---

Wireless Power transfer system is designed not to replace the whole cable but to improve equipment reliability and user convience. Circuit design on this system basicly is Variable Comparator circuit which consist of voltage comparator which act as adjustment frequency circuit to make This transmitter easier when have to work with different frequency and LC Mosfet that is used to convert from direct current to become alternating current that will produce electromagnetic induction to antenna."

"Channel estimation memiliki definisi untuk memperkirakan koefisien filter melalui sinyal yang diterima dan informasi lain yang dikenal. Ada beberapa metode channel estimation yang dapat diguanakan seperti minimum mean square error, least square, zero-force, maximum likelihood. Dalam penelitian ini, least square dan zero-force akan dibahas lebih lanjut. Kedua jenis ini dikenal umum sebagai jenis yang paling sederhana dan paling mudah untuk diterapkan di dalam komunikasi nirkabel. Meskipun metode lain seperti minimum mean square error atau maximum likelihood telah dikenal secara luas untuk memperkirakan kanal, metode tersebut terbukti sangat kompleks untuk diimplementasikan.Penelitian ini bertujuan untuk memahami efek dan membandingkan kinerja channel estimation dengan menggunakan kapasitas multi antenna seperti Single-Input Single Output (SISO), Multiple-Input Single-Output (MISO), Single-Input Multiple-Output (SIMO) dan Multiple-Input Multiple-Output (MIMO). Least square dan metode estimasi zero-force telah digunakan dengan memakai modulasi Binary Phase Shift Keying (BPSK), hal ini dikarenakan BPSK adalah metode phase shift keying yang paling sederhana untuk di implementasikan di dalam penelitian ini. Pertama-tama, segala parameter perlu dikonfigurasi terlebih dahulu untuk digunakan di dalam simulasi. Kemudian, data dalam sistem pilot dikirim ke penerima menggunakan modulasi BPSK di setiap sistem multi antenna dengan menggunakan saluran nirkabel yang berbeda. Lalu, Alamouti encoder dieksekusi khusus untuk sistem MIMO dan MISO. Setelah itu, least square dan zero-force diterapkan dan tingkat kesalahan bit atau dengan nama lain bit error rate (BER) dapat dicapai dengan menyamakan sinyal yang ditransmisikan. Kemudian, analisa hasil data dengan membandingkan kinerja least square dan zero-force dapat dicapai. Pada akhirnya, hasil yang telah ditemukan menunjukkan bahwa least square melakukan performa lebih baik daripada metode estimasi zero force yang berlaku pada kinerja tingkat kesalahan bit dengan sinyal terhadap noise atau dengan nama lain signal to noise ratio (SNR).

---

Channel estimation has a definition to estimate the filter coefficient through received signal and other known information. There are many methods that channel estimation can be used such as minimum mean square error, least square, zero-force, maximum likelihood. In this research, least square and zero force will be discussed further. These two types are commonly known as the simplest and easiest type to implement in the wireless communication. Even though other methods like minimum mean square error or maximum likelihood have been widely known to estimate channel, such methods are proven very complex to implement.

The aimed of this research is to understand the effect and compare the performance of the channel estimation method with the capacity of multiple antennas such as Single-Input Single-Output (SISO), Multiple-Input Single-Output (MISO), Single-Input Multiple-Output (SIMO) and Multiple-Input Multiple-Output (MIMO). Least square and zero force estimation method were being used with BPSK modulation, this is due to BPSK is the simplest phase shift keying.

First, the parameters need to be configured in simulation software. Then, the data within pilots system transmitted to receiver using BPSK modulation in each of the wireless antenna systems with different wireless channels. Space time block coding of Alamouti encoder were executed for MIMO and MISO system. After that, least square and zero force method were implemented and bit error rate (BER) performance can be achieved by equalizing the transmitted signal. Analysing the result by comparing the performance of least square and zero force were accomplished.

In the recent result, it was shown that the least square performs better than zero force estimation method for the performance of bit error rate with signal to noise ratio."