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Anatomy of Radio LAN Onno W. Purbo
Reference Tourrilhes/Linux/Linux.Wireless.wlan.ht ml
Spread Spectrum Techniques Direct Sequence Frequency Hopping
Comparisons DS modem more complicated, MAC in DS much simpler. FH appears to be cheaper. BW sharing, DS tends to have lower overhead on the air. DS vs. FH = religion war …
Diversity Redudancy in the system to overcome noise and to increase the reliability of the system. Antenna Diversity
Antenna Directional Antenna Sectoral Antenna Beam forming Antenna
Range Issues Propagation Attenuation Reflection Fading
Transmitter Power Higher power: Drain battery quickly Frequency reuse drawback
Sensitivity Defined as Point at 3% packet loss (400 byte packet in Gaussian channel). 7 dB worse if we use Raleigh channel + antenna diversity. Normally –80 dBm, better –90 dBm.
Attenuation: Propagation & Range
SNR Signal-to-Noise Ratio Difference of power in the receiver between a valid signal and noise.
Multi-rate system Better throughput more bandwidth. The higher the signalling rate, the shorter the distance.
2FSK B = base frequency d = deviation symbol 0 B + d 1 B – d
Frequency Modulation 2FSK
4FSK B = base frequency d = deviation Symbol 00 B+ 1/2d 01 B – 1/2d 10 B + 3/2d 11 B – 3/2d
IEEE (11Mbps) CCK – Complementary Code Keying 11 Mbps 5.5Mbps
IEEE a (OFDM) Orthogonal Frequency Division Multiplex (OFDM). Using equalization in post processing, overcome delay spread. OFDM is pre-processing technique. Use in 5Ghz UNII Band.
Interference & Noise
Fading Variation in time. Microwave oven & other interferer. Forward Error Correction (FEC) Not effective, better retransmit the packet. Delay Spread
Multipath & Delay Spread
UAbove Law fahrul hakim2003 Wireless LAN implications Project managers and design engineer should be aware, the following potential problems from the implementation.
Yokogawa Corporation of America Network Solutions Business Unit An Introduction to Industrial Wireless Networking Presented by Yokogawa North America Network.
Wireless Networks. Presentation Outline Wireless Technology overview The IEEE WLAN Standards Securing Wireless LANs.
ECSE 6592 Wireless Ad Hoc and Sensor Networks Spatial Diversity in Wireless Networks Hsin-Yi Shen Nov 3, 2005.
Chaper 11-Wireless LANS Wireless LAN Concepts Deploying WLANs Wireless LAN Security.
Doc.: IEEE /xxxr TGs – Outdoor Mesh RF Impacts Considerations July 2004 Tricci So, Nortel NetworksSlide 1 Outdoor Mesh.
Interference of Bluetooth and IEEE , MSWIM01 July 21, 01 1 Interference of Bluetooth and IEEE : Simulation Modeling and Performance Evaluation.
Doc.: IEEE /344r1 Submissio n September 2003 Welborn, XtremeSpectrum, Inc.Slide 1 Project: IEEE P Working Group for Wireless Personal Area.
RF basics & getting started Acknowledgement: Most of the information in this presentation.
1 Chapter 3 Digital Communication Fundamentals for Cognitive Radio Cognitive Radio Communications and Networks: Principles and Practice By A. M. Wyglinski,
Bluetooth / IEEE Coexistence Reliability of IEEE WLANs in Presence of Bluetooth Radios Jim Zyren
Doc.: IEEE /154 Submission March 2001 S. Halford, M. Webster, & J. Zyren, Intersil Corporation Slide 1 OFDM as a High Rate Extension to the CCK-based.
Wi-Fi and Bluetooth Laboratorio di El&Tel Mauro Biagi.
Multiple-Input-Multiple- Output (MIMO) Systems Basic principles, Algorithms and Networking Applications HARISH GANAPATHY.
© 2008 Cisco Systems, Inc. All rights reserved.WLAN-RF-Principles-1 Wireless LAN RF Principles.
Electromagnetic Radio in the Sea: Is it more than boiling water? Petar Djukic Research Scientist (jew♦kitch) Joint work with Mylène Toulgoat.
EE578 Assignment #4 Abdul-Aziz.M Al-Yami Nov 1 st 2010.
How other SRW affect your WLAN Performance Abdullah A. Al-Asmari Saudi Aramco/ IT Copyright © Saudi Aramco 2005.
MIMO Systems for MANETs Vivek Jain. Outline Antenna System Smart Antenna System Gigabit Wireless Links – Design Challenges in SISO Links Need for MIMO.
Microelectronics THE SECOND IEEE WORKSHOP ON Wireless Local Area Networks IEEE Wireless LAN draft Standard Keith B. Amundsen Wireless Solutions.
6: Wireless and Mobile Networks6-1 Chapter 6 Wireless and Mobile Networks Computer Networking: A Top Down Approach 4 th edition. Jim Kurose, Keith Ross.
Doc.: IEEE /140r6 Submission July 2004 Kohno NICT, Welborn Freescale, Mc Laughlin decaWave Slide 1 Project: IEEE P Working Group for Wireless.
HANDBOOK ON GREEN INFORMATION AND COMMUNICATION SYSTEMS Chapter 15 Energy Efficient MIMO-OFDM Systems Zimran Rafique and Boon-Chong Seet Auckland University.
Doc.: IEEE r0 Submission May 2005 C. Razzell et alSlide 1 Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Doc.: IEEE /381r0 Submission September, 2003 Razzell(Philips), Dabak(TI)Slide 1 Project: IEEE P Working Group for Wireless Personal Area.
Chapter 2: Digital Modulation Introduction –Electronic communications is the transmission, reception and the processing of the information with the use.
EE578 Assignment #3 Abdul-Aziz.M Al-Yami October 25 th 2010.
Doc.: IEEE g Multi-Regional Sub-GHz PHY for g March 2009 Khanh Tuan LeSlide 1 Project: IEEE P Working Group for Wireless.
The Physical Layer Chapter 2 CN5E by Tanenbaum & Wetherall, © Pearson Education-Prentice Hall and D. Wetherall, 2011 Theoretical Basis for Data Communications.
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