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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
Wireless Networks. Anatomy of a radio LAN The radio modem –Analog transmitter The MAC controller –Interface to transmitter –At least partly in hardware.
1 Orthogonal Frequency- Division Multiplexing (OFDM) Used in DSL, WLAN, DAB, WIMAX, 4G.
Design MAN WLAN Onno W. Purbo Understanding.. WLAN Bandwidth Channels Propagation Designing the MAN Inserting Point to Point (P2P) Links.
UAbove Law fahrul hakim2003 Wireless LAN implications Project managers and design engineer should be aware, the following potential problems from the implementation.
W.lilakiatsakun. Radio Wave Fundamental Radio Wave Attributes RF System Component RF Signal Propagation RF Mathematics.
CWNA Guide to Wireless LANs, Second Edition Chapter Four IEEE Physical Layer Standards.
Wireless Networks and Spread Spectrum Technologies.
b Modulation Scheme Presented By: Nishant Divecha.
CSCI 465 D ata Communications and Networks Lecture 23 Martin van Bommel CSCI 465 Data Communications & Networks 1.
IEEE Wireless LAN Standard. Physical Layer Three physical media are defined in the original standard: Direct sequence spread spectrum (DSSS)
FHSS vs. DSSS Presented by Ali Alhajhouj. Presentation Outline Introduce the issues involved in the system behaviors for FHSS and DSSS systems used in.
Doc.: IEEE /159r0 Submission March 2002 S. Hori, Y Inoue, T. Sakata, M. Morikura / NTT. Slide 1 System capacity and cell radius comparison with.
Chapter 6-Wireless Networks and Spread Spectrum Technology Frequency bands, channels and technologies.
CWNA Guide to Wireless LANs, Second Edition Chapter Four IEEE Physical Layer Standards Modified.
A Simple Transmit Diversity Technique for Wireless Communications -M. Alamouti 1998 Chou-pin Wu 09/06/2006.
1 Lecture 9: Diversity Chapter 7 – Equalization, Diversity, and Coding.
Wireless LAN - PHY layer Omer Ben-shalom. Lecture brief Technology background Radio transmission (line codes, modulation) Error correction Spread.
Wi-fi Range. Topics Discussed When we say range or coverage, what do we mean? What factors can affect range? Why are there so many different designs of.
Joint PHY-MAC Designs and Smart Antennas for Wireless Ad-Hoc Networks CS Mobile and Wireless Networking (Fall 2006)
IEEE 802 Series LAN/MAN Bridging & Management Logical Link Control CSMA/CD (Ethernet) Token Bus Token Ring Wireless.
ESTeem Training Class Radio Technology Overview. Radio Basics Terminology – Familiarization with radio expressions Basic Components – Transmitter – Receiver.
The Reliability of Wireless Mesh Networks in Industrial Environments Brian Cunningham.
Wireless communication channel. Signal degradation can be classified by type : – Path Loss happen during distance covered by the radio signal, it is called.
Direct Sequence Spread Spectrum. Spread Spectrum Spread power of signal over larger than necessary bandwidth in order to: 1. Reduce interference by signal.
HUSEYIN ARSLAN Electrical Engineering EE-6593 Course Outline Lecture-2: Basics of wireless –Important terminology and definitions (wireless, mobile, cellular,
a/g OFDM PHY wireless networks, chapter 11 OFDM wireless LANs, part of chapter 3 S , Postgraduate Course in Radio Communications Juha.
Sep 08, 2005CS477: Analog and Digital Communications1 Example Systems, Signals Analog and Digital Communications Autumn
© 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—3-1 Wireless LANs Exploring Wireless Networking.
#7 1 Victor S. Frost Dan F. Servey Distinguished Professor Electrical Engineering and Computer Science University of Kansas 2335 Irving Hill Dr. Lawrence,
Data and Computer Communications Tenth Edition by William Stallings Data and Computer Communications, Tenth Edition by William Stallings, (c) Pearson Education.
24-July-2007 Wireless Networks. Wireless Technologies Bluetooth, ZigBee & Wireless USB short range communication between devices typically controlled.
WLAN System Capacity Zahid Iqbal. WLAN Technologiess IEEE802.11a IEEE802.11b IEEE802.11g.
Quiz Sketch the time domain waveform and spectrum, labeling all important features, of a rectangular pulse of 2.4 Ghz having 1 uS duration.
OFDM Transmission Technique Orthogonal Frequency Division Multiplexer EE 578 Assignment # 4 Mohammad Alkhodary ID:
Direct Sequence Spread Spectrum vs. Frequency Hopping Spread Spectrum Prof./Dr. Gordon L. Stüber.
© 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0— © 2003, Cisco Systems, Inc. All rights reserved.
Shivkumar Kalyanaraman Rensselaer Polytechnic Institute 1 ECSE-6961: Fundamentals of Wireless Broadband Networks Spring 2007, Exam 1 SOLUTIONS Time: 75.
Advanced Topics in Next- Generation Wireless Networks Qian Zhang Department of Computer Science HKUST Wireless Radio.
Complementary Code Keying with PIC based microcontrollers for The Wireless Radio Communications.
OFDM Based WLAN System Song Ziqi Zhang Zhuo. Wireless Channel Wireless channel is always unpredictable Multipath reception is the unique characteristic.
TI Cellular Mobile Communication Systems Lecture 4 Engr. Shahryar Saleem Assistant Professor Department of Telecom Engineering University of Engineering.
A REVIEW: PERFORMANCE ANALYSIS OF MIMO-WiMAX AKANKSHA SHARMA, LAVISH KANSAL PRESENTED BY:- AKANKSHA SHARMA Lovely Professional University.
802.11g Update Byron Early & Chad Burnham University Technology Services Westnet Meetings: July 8-10, 2003.
© 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—3-1 Wireless Radio Technology Olga Torstensson Halmstad University.
.11 tech. OVW 1 Module contents Technologies overview Spread Spectrum Direct Sequence Frequency Hopping Modulation DBPSK/DQPSK CCK.
Introduction to Protocol(WLan Standard) In the name of God University of Tehran School of Electrical and Computer Engineering By: Noushin Behboudi.
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