The baseband part of IEEE 802.15.4 operated in 2.45 GHz mode is designed and implemented in this essay. First, the features of IEEE 802.15.4 WPAN(Wireless Personal Area Network), PHY layer and MAC Layer are introduced. Then the algorithm and VHDL of the baseband part of transceiver are designed and verified by FPGA board and logical analyzer.

In recent years, the worldwide progress of wireless communication technology has bringing great benefit and convenience to our people¡¦s life. Nowadays, people can use appliances of wireless communication in many fields, such as family-monitoring, automatic system, and smart-type device¡Ketc. However, in order to dealing with the need of low cost and low power communication, the researcher spend many years on developing the specification of IEEE 802.15.4 Low Rate-Wireless Personal Area Network (LR-WPAN) expected be applied in widespread use. In this thesis, we focus on the baseband signal processing for the physical layer specification of the 868/915MHz mode of the IEEE 802.15.4 LR-WPAN. Our design blocks include packet detection, sampling point detection (energy detection), carrier frequency offset (CFO) compensation, carrier phase offset (CPO) compensation, and despreading algorithms. During the process of simulation, we¡¦ll examine whether our design match the criteria of standard such as sensitivity, packet format, and modulation. While our designs achieve the requirement of the standard, we start on quantization. Finally, we¡¦ll realize the algorithm in VHDL and examine it.

The thesis is mainly in algorithm design and implementation of hardware circuit of baseband signal processing at the transceiver of 2450 MHz band chirp spread spectrum in IEEE 802.15.4a ¡V 2007 Low Rate-Wireless Personal Area Network (LR-WPAN). Due to the characteristic of LR-WPAN such as low cost, low power consumption, small size and easy to implementation, we have to take the complexity and the system performance into consideration. In this thesis, we study on the algorithm design of baseband signal, and analysis the simulation result. At the transmitter, following the specification and realize it. At the receiver, designing the algorithm including the packet detection, energy detection and down-sampling, carrier frequency offset estimation and compensation, timing synchronization, and bi-orthogonal demapper. The system performance after quantizing is 3dB better than the receiver sensitivity we expected. After finishing the algorithm design of the transceiver, we implement the baseband signal circuit by using Verilog Code. Finally, we make an application to National Chip Implementation Center (CIC), and will measure the circuit after the chip tape out. The circuit is fabricated in a 0.18-£gm CMOS technology.

The IEEE802.15.4 Low Rate-Wireless Personal Area Network (LR-WLAN) is characterized by its low power consumption, low cost, and reliable data transfer. LR-WPAN can be used for security monitoring, by automatically setting various sensors which can be placed anywhere in the factory or home. This work implements baseband signal processing and circuit design for the 868/915MHz mode of the IEEE802.15.4 LR-WPAN. The development processes include algorithm design, system simulation, FPGA implementation and system measurements. The receiver algorithm includes packet detection, phase mapping, frequency offset estimation, energy detection, synchronization, despreading and differential decoding. All algorithms are completely described herein. The system simulation match the required specifications after running the algorithms. Additionally, algorithms are composed by the Verilog Hardware Description Language (VHDL) form. The process is designed according to the hardware to identify exactly each link . The simulations performed in this work include behavioral simulation and gate level simulation. Finally, the program is uploaded to the FPGA to verify results of the procedures is verified by Matlab, by determining the effects of transmission on the channel signal, including idle signals, initial phase, frequency offset and noise. The frequency offset arises when the oscillators of the transmitter and receiver do not match. The transmitter signal from the logic analyzer is then input to the FPGA. The signal sent from the logic analyzer is tested to determine whether it retains the original transmission signal homology. Finally, a LR-WPAN baseband circuit is successfully developed through by the above procedures.

This thesis is focused on the smart public lighting management possibilities. It describes smart public lighting management itself and the advantages of the new management possibilities compared to the current ones are illustrated as well. Furthermore, it deals with a comparison of the most used light resources and LED light resources. This thesis also outlines NS-3 simulation environment and states its advantages. Theoretical concept for energy-saving smart public lighting management system and its modifications for the needs of simulation is described in the paper. This theoretical concept is simulated and compared with the current smart public lighting management systems as well as with the systems designated by the third party.

Wireless Sensor Networks are the main representative of pervasive computing in large-scale physical environments. These networks consist of a large number of small, wireless devices embedded in the physical world to be used for surveillance, environmental monitoring or other data capture, processing and transfer applications. Ultra wideband has emerged as one of the newest and most promising concepts for wireless technology. Considering all its advantages it seems a likely communication technology candidate for future wireless sensor networks. This paper considers the viability of ultra wideband technology in wireless sensor networks by employing an IEEE 802.15.4a low-rate ultra wideband physical layer model in the OMNET++ simulation environment. An elaborate investigation into the inner workings of the IEEE 802.15.4a UWB physical layer is performed. Simulation experiments are used to provide a detailed analysis of the performance of the IEEE 802.15.4a UWB physical layer over several communication distances. A proposal for a cognitive, adaptive communication approach to optimize for speed and distance is also presented. AFRIKAANS : Draadlose Sensor Netwerke is die hoof verteenwoordiger vir deurdringende rekenarisering in groot skaal fisiese omgewings. Hierdie tipe netwerke bestaan uit ’n groot aantal klein, draadlose apparate wat in die fisiese wêreld ingesluit word vir die doel van bewaking, omgewings monitering en vele ander data opvang, verwerk en oordrag applikasies. Ultra wyeband het opgestaan as een van die nuutste en mees belowend konsepte vir draadlose kommunikasie tegnologie. As al die voordele van dié kommunikasie tegnologie in ag geneem word, blyk dit om ’n baie goeie kandidaat te wees vir gebruik in toekomstige draadlose sensor netwerke. Hierdie verhandeling oorweeg die vatbaarheid van die gebruik van die ultra wyeband tegnologie in draadlose sensor netwerke deur ’n IEEE 802.15.4a lae-tempo ultra wyeband fisiese laag model in die OMNET++ simulasie omgewing toe te pas. ’n Breedvoerige ondersoek word geloots om die fyn binneste werking van die IEEE 802.15.4a UWB fisiese laag te verstaan. Simulasie eksperimente word gebruik om ’n meer gedetaileerde analiese omtrent die werkverrigting van die IEEE 802.15.4a UWB fisiese laag te verkry oor verskillende kommunikasie afstande. ’n Voorstel vir ’n omgewings bewuste, aanpasbare kommunikasie tegniek word bespreek met die doel om die spoed en afstand van kommunikasie te optimiseer. / Dissertation (MEng)--University of Pretoria, 2011. / Electrical, Electronic and Computer Engineering / unrestricted

Made available in DSpace on 2016-04-04T18:31:25Z (GMT). No. of bitstreams: 1 Diego Cesar Valente e Silva.pdf: 2949032 bytes, checksum: 9f8f72c0ab49b16ab87dbd229e5acc93 (MD5) Previous issue date: 2009-02-09 / This work presents an experimental investigation on the implementation of wireless sensor networks (IEEE 802.15.4) over fiber optics. Such investigation was performed with the utilization of IEEE 802.15.4 transceivers, an optical fiber infrastructure inside a field-trial network, called KyaTera Network, and directly modulated lasers and photodiodes designed for usual lab applications. The analysis comprised optical and electrical signal-to-noise ratio meausermentes and packet error rate evaluation under different conditions of transmission (e.g., payload length and time between consecutive frames). Results indicate that the RF signals of the sensor network may be properly propagated through unamplified optical links of up to 100 km or for longer distances with the use of optical amplifiers. / Esse trabalho apresenta uma investiga??o experimental da implementa??o de redes de sensores (IEEE 802.15.4) sobre fibras ?pticas. Tal investiga??o foi realizada com a utiliza??o de transceptores IEEE 802.15.4, de uma infra-estrutura de fibras ?pticas localizada dentro uma rede experimental, chamada Rede KyaTera, e de lasers com modula??o direta e foto-diodos projetados para opera??es usuais em laborat?rios. A an?lise compreendeu medidas a raz?o sinal-ru?do ?ptica e el?trica e a avalia??o da taxa de erro de quadros sob diferentes condi??es de transmiss?o (p. ex., tamanho de payload e intervalo de tempo entre quadros sucessivos). Os resultados indicam que os sinais de RF da rede de sensores podem ser propagados adequadamente, sem amplifica??o ?pticapor, em enlaces de at? 100 km ou por dist?ncias ainda maiores, com a utiliza??o de amplificadores ?pticos.

The Master’s Thesis deals with a ZigBee technology and its devices working each other in wireless personal area network. The ZigBee and its advantages are compared with other wireless protocols working in ISM bands. A first part deals with a topology of IEEE 802.4.15 WPAN and the ZigBee features. Types and format of the ZigBee data-frame are mentioned. A Second part of this thesis describes a design and testing of the ZigBee devices. Results of this thesis are demonstrated on ZMU (ZigBee Modules Utility) program that has been developed for the testing of this technology.