Hasil Pencarian  ::  Simpan CSV :: Kembali

"This volume wipes away a host of problems related to location discovery in wireless ad-hoc sensor networks. WASNs have recognized potential in many applications that are location-dependent, yet are heavily constrained by factors such as cost and energy consumption. Their “ad-hoc” nature, with direct rather than mediated connections between a network of wireless devices, adds another layer of difficulty. Basing this work entirely on data-driven, coordinated algorithms, the author’s aim is to present location discovery techniques that are highly accurate and which fit user criteria. The research deploys nonparametric statistical methods and relies on the concept of joint probability to construct error (including location error) models and environmental field models. It also addresses system issues such as the broadcast and scheduling of the beacon. Reporting an impressive accuracy gain of almost 17 percent, and organized in a clear, sequential manner, this book represents a stride forward in wireless localization."

"Saat ini telah dikembangkan baik melalui riset maupun implementasi jaringan wireless yang tidak bergantung pada suatu infrastruktur yang dikenal dengan mobile ad hoc network (Mamet). Manet mempakan jaringan yang memiliki kemampuan untuk mengelola dan mengorganisasi secara mandiri, yang terbentuk dari sekumpulan node yang menggunakan wireless interface mereka untuk melakukan komunikasi antara satu node dengan node yang lain. Setiap node bisa menjadi host ataupun router, sehingga node mampu memforward paket ke node berikutnya.Video streaming merupakan metoda untuk mentransmisikan video dengan sifatnya yang real time, yang artinya pada sisi penerima bisa menyajikan video yang diterima tanpa harus menunggu data keseluruhan secara lengkap. Karakteristik dari video itu sendiri merupakan data yang berukuran besar sehingga dalam pentramisiannya membutuhkan bandwidih yang cukup besar pula. Pada dasarnya, untuk mengatasi keperluan akan jumlah bit yang tinggi ini ada dua cara, Pertama, dengan memperbesar bandwidth pada jaringan, sehingga dapat menyalurkan laju bit tinggi, Kedua, dengan melakukan kompresi atau pemampatan data, yaitu data yang akam ditransmisiskan dikompresi dengan metode tertentu, sehingga membutuhkan jumlah bit yang lebih sedikit. Mengingat keterbatasan bandwidth yang umumnya terjadi pada wireless network, maka untuk pentransmisian video bisa menggunakan cara kedua, yakni menggunakan teknik kompresi, yang salah satunya adalah MPEG.Dari basil pengujian menunjukkan bahwa end-to-end delay dan jitter, baik total maupun rata-rata, untuk MPEG-4 lebih kecil dari MPEG-1 dan MPEG-2, sebelum dan sesudah implementasi TCP SACK_ Packer loss hanya tetjadi pada MPEG-1 transfer rate 236 Kbps, sebelum implemenatsi TCP SACK, yakni sebesar 0.03 %."

"This book focuses on non-GNSS positioning systems and approaches. Although it addresses both theoretical and practical aspects, the primary focus is on engineering practice. This is achieved by providing in-depth studies on a number of major topics such as tracking system architecture, link budget, system design, implementation, testing, and performance evaluation. It studies four positioning application cases in detail: covert vehicle tracking, horse racing, rowing, and tracking for field sports.Its comprehensive and systematic treatment of practical issues in wireless positioning makes the book particularly suitable for readers who are interested in learning about practical wireless positioning solutions. It will also benefit researchers, engineers and graduate students in fields such as positioning and navigation, geospatial engineering and telecommunications."

"This book constitutes the refereed proceedings of the 10th International Conference on Wired / Wireless Internet Communications, WWIC, held in Santorini island, Greece during June 6-8, 2012. The 23 revised full papers and 6 short papers presented were carefully reviewed and selected from 50 submissions. The papers are organized in six thematically-distinct technical sessions, covering the following major topics: virtual networks and clouds, multimedia systems, wireless sensor networks and localization, delay-tolerant and opportunistic networks, handover techniques and channel access, and ad hoc networks."

"Covers the low-power Wireless sensor network (WSN) services ranging from hardware platforms and communication protocols to network deployment, and sensor data collection and actuation. This book explains the implications of resource constraints and expected performance in terms of throughput, reliability and latency. "

"ABSTRAKJaringan wireless ad-hoc mulai banyak digunakan dalam aplikasi multimedia. Aplikasi ini mempunyai karakteristik seperti kebutuhan akan Quality of Service (QoS). Salah satu solusi untuk menjamin QoS adalah bandwidth reservation. Dalam laporan ini, akan disampaikan evaluasi unjuk kerja MAC reservation protocol untuk dukungan trafik suara pada jaringan wireless ad hoc. Protokol dievaluasi berdasarkan pada IEEE 802.11. Dalam peneliatian ini, dibuat beberapa simulasi untuk mengevaluasi unjuk kerja dari protocol MAC yang diteliti.

---

ABSTRACTThe ad hoc wireless networks are increasingly used by multimedia applications. These applications are characterized by the existence of constraints on quality of service (QoS) to respect. One solution to guarantee QoS is the bandwidth reservation. In this report, I present the performance evaluation of a MAC protocol for bandwidth reservation in ad hoc networks to support wireless traffic such as voice. The protocol is evaluated based on IEEE 802.11. I have made several simulations to evaluate the performance of MAC protocol considered."

"This book constitutes the thoroughly refereed post-conference proceedings of the 6th International ICST Conference on Wireless Internet (WICON 2011) held in Xi’an, Shaanxi, China in October 2011. The 55 revised full papers were carefully selected from numerous submissions and focus on research in telecommunication and networking and development in information and communication technologies. The papers are presented in 10 technical sessions and cover topics as video streaming over OFDMA downlink systems, cognitive radio networks, distributed antenna systems, joint source channel coding, multiuser MIMO systems, signal detection, frequency synchronization in 3GPP LTE systems, visual cognitive radio, wireless relay networks, and network flow identifying methods."

"Dalam penelitian ini, dirancang sistem lampu jalan pintar berbasiskan komunikasi nirkabel menggunakan ZigBee 2.4 GHz yang dilengkapi dengan sensor (sensor cahaya, sensor gerak, sensor arus dan tegangan), pembaca waktu dan mikrokontroler sehingga sistem mampu mengatur fungsi kerjanya secara otomatis sesuai dengan waktu dan kondisi lingkungan sekitar. Sistem komunikasi lampu jalan pintar ini menggunakan konfigurasi jaringan ad-hoc untuk mengirimkan informasi data dari setiap titik lampu (node) menuju server. Konfigurasi jaringan ad-hoc membuat sistem lebih fleksibel karena setiap node dapat saling berkomunikasi secara langsung tanpa harus melalui access point. Selain itu, sistem ini juga menggunakan lampu LED serta menerapkan teknologi on-grid yang menggunakan tenaga cahaya matahari sebagai sumber daya utamanya, sehingga mampu menghemat konsumsi energi. Dari hasil pengujian dapat diketahui bahwa sistem telah dapat bekerja sesuai dengan algoritma yang dirancang (algoritma pemilih sumber daya, algoritma fungsi kerja sensor dan lampu serta algoritma komunikasi data). Pada pengujian komunikasi data dari node router ke node coordinator, diperoleh tingkat keberhasilan penerimaan data sebesar 82.085%. Kemudian dari hasil simulasi perhitungan efisiensi sistem didapatkan total penggunaan daya lampu jalan pintar per tahun hanya sebesar 59.09 KWh / lampu. Sehingga sistem lampu jalan pintar jauh lebih efisien dalam konsumsi energi dibandingkan dengan sistem lampu jalan eksisting lainnya.

---

In this study, the authors designed a smart street lighting system based on wireless communication using ZigBee 2.4 GHz which is equipped with sensors (light sensor, motion sensor, current and voltage sensor), time readers and the microcontroller so that the system is able to regulate its function automatically according to the time and environmental conditions. Smart street lights communication system using Ad-hoc network configuration to transmit the data information of each point of light to the server. Ad-hoc network configuration makes the system more flexible because each node can communicate with each other directly without having to go through an access point. In addition, this system also uses LED lights and apply on-grid technology that uses the energy of sunlight as its primary power source, so it is able to save on energy consumption.

From the test results can be seen that the system has been able to work in accordance with an algorithm that is designed (resources switching algorithms, work function of light and sensor algorithms and data communication algorithms). On data communications testing for transmitting data from router node to coordinator node, obtained data reception success rate of 82.085%. Then from the results of the calculation simulation of the efficiency of the system obtained the total power usage of smart street lights per year only amounted to 59.09 KWh / lamp. So the smart street lighting system is much more efficient in terms of energy consumption compared to other existing street lighting system."

"This textbook introduces Wireless Powered Communication Networks (WPCNs) as a promising paradigm to overcome the energy bottleneck suffered by traditional wireless communication networks, as well as emerging Internet-of-Things networks. It selectively spans a coherent spectrum of fundamental aspects in WPCNs, such as wireless energy transfer (WEH) techniques, radio frequency (RF) energy harvesting receiver model, simultaneous wireless information and power transfer (SWIPT), as well as the rate-energy tradeoff arising from the joint transmission of information and energy using the same waveform. It covers network models for WPCNs, including the baseline and dual-hop WPCN models and a variety of related extensions. This book further examines the key factors including throughput, fairness, and security that must be taken into account for impeccable operation of WPCNs. The new IoT applications are targeted as a key element in those factors. It will also include exercises and examples throughout the book, as well as their PLS solutions.This is the first textbook examining the current research to provide a unified view of wireless power transfer (WPT) and information transmission in WPCNs from a physical layer security (PLS) perspective. Focused on designing efficient secure transmission schemes, analyzing energy evolvement process, and evaluating secrecy outage performance under different channel state information (CSI), the results presented in this book shed light on how to best balance security and throughput with prudent use of harvested energy in WCNs. It also provides an overview of the WPCNs by introducing the background of WPT, followed by a summary of the research conducted in the field. The authors describe the physical-layer security (PLS) problem in WPCNs, including the causes and the impacts of the problem on the performance of WPCNs. The authors extend the discussions by introducing the applications of WPCNs in the IoT.From the Internet of Things (IoT) point of view, this textbook reviews the opportunities and challenges for the lately-emerged WPCN to seamlessly integrate into the IoT ecosystem. It specifically addresses the maximization problem of uplink and downlink sum-throughout in a dual-hop WPCN, while taking fairness among WPCN users as a constraint. The results provided in this book reveal valuable insights into improving the design and deployment of future WPCNs in the upcoming IoT environment.This textbook targets advanced-level students studying wireless communications and research engineers working in this field. Industry engineers in mobile device and network development business with an interest in WPCNs and IoT, as well as their PLS solutions, will also find this book useful."