'Direct sequence' presentation slideshows

Wireless Overview Protocols and Threat Models

Wireless Overview Protocols and Threat Models. Dan Veeneman dan@decodesystems.com www.decodesystems.com/blackhat/bh-1.ppt. Focus of this talk. Overview of available commercial technologies Skipping 802.11 U.S.-centric Terrestrial networks Additional information in second briefing.

987 views • 85 slides

Physical Media

physical link: transmitted data bit propagates across link guided media: signals propagate in solid media: copper, fiber unguided media: signals propagate freely, e.g., radio. Twisted Pair (TP) two insulated copper wires Category 3: traditional phone wires, 10 Mbps ethernet

882 views • 78 slides

Fundamentals of Wireless LANs 1.2

Fundamentals of Wireless LANs 1.2. Module 4: Wireless Topologies. Overview. This chapter is just an overview of many topics that we will discuss in much more detail in later chapters. Components. Devices on the WLAN.

634 views • 50 slides

CWNA Guide to Wireless LANs, Second Edition

CWNA Guide to Wireless LANs, Second Edition. Chapter Four IEEE 802.11 Physical Layer Standards. Objectives. List and describe the wireless modulation schemes used in IEEE WLANs Tell the difference between frequency hopping spread spectrum and direct sequence spread spectrum

598 views • 49 slides

The Basics of Code Division Multiple Access

The Basics of Code Division Multiple Access. Jean-Paul M.G. Linnartz Philips Research and TU/e. Outline. Multiple access methods FDMA, TDMA, CDMA Spread spectrum methods Frequency Hopping Direct Sequence More on code sequences IS-95 cellular CDMA Rake receiver Multi-Carrier CDMA

746 views • 48 slides

Mobile Communication Systems 2 MSc Data Comm

Mobile Communication Systems 2 MSc Data Comm. Rolando A Carrasco Professor in Mobile Communications BSc(Hons), PhD, CEng, FIEE r.carrasco@ncl.ac.uk School of Electrical, Electronic and Computing Engineering University of Newcastle upon tyne. PSTN, ISDN BISDN,. Fixed Networks. A. B.

591 views • 45 slides

Shared Access Networks

Problem : physically connecting hosts. Direct link networks: point-to-point links shared access networks. Shared Access Networks. Hamidreza Chitsaz http ://compbio.cs.wayne.edu/chitsaz.

596 views • 44 slides

DIGITAL SPREAD SPECTRUM SYSTEMS

DIGITAL SPREAD SPECTRUM SYSTEMS. ENG-737 Lecture 9. Wright State University James P. Stephens. MULTIPATH SCENARIO. TYPES OF FADING DUE TO MULTIPATH. Multipath - Delay Spread Flat Frequency selective Doppler (Frequency Dispersion) Fast Slow What is Coherence BW?

563 views • 40 slides

Heterogeneous Wireless Networks

Heterogeneous Wireless Networks. ??? ??? ??????????? / ? 9/2003 ( ???? : ????????? ????? , ????????? ). Outline. Trend on Wireless / Cellular Networks Heterogeneous Wireless Networks Datacom: Wireless Networks Telecom: Cellular Networks Some Research Issues

1.04k views • 40 slides

Spread Spectrum Modulation

Spread Spectrum Modulation. Dr. Teerasit Kasetkasem. Introduction. Introduction. Introduction. Introduction. Introduction. Concept of Spread-spectrum modulation It will spread the spectrum of transmitted signals into wider range.

911 views • 37 slides

ECE 4371, Fall, 2013 Introduction to Telecommunication Engineering/Telecommunication Laboratory

ECE 4371, Fall, 2013 Introduction to Telecommunication Engineering/Telecommunication Laboratory. Zhu Han Department of Electrical and Computer Engineering Class 21 Dec. 2 nd , 2013. Outline. CDMA OFDM. spread-spectrum transmission . Three advantages over fixed spectrum

490 views • 34 slides

Multiplexing and Spreading (Bandwidth Utilization)

807 views • 33 slides

William Stallings Data and Computer Communications 7 th Edition

William Stallings Data and Computer Communications 7 th Edition. Chapter 9 Spread Spectrum. Spread Spectrum. Analog or digital data Analog signal Spread data over wide bandwidth Makes jamming and interception harder Frequency hoping

394 views • 28 slides

William Stallings Data and Computer Communications 7 th Edition

William Stallings Data and Computer Communications 7 th Edition. Chapter 9 Spread Spectrum. Spread Spectrum. Analog or digital data Analog signal Spread data over wide bandwidth Makes jamming and interception harder Frequency hoping

356 views • 28 slides

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [LRSG-RF Lite Overvie

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [LRSG-RF Lite Overview] Date Submitted: [6, November, 2000] Source: [Benno Ritter] Company [Philips Semiconductor] Address [1109 McKay Drive M/S 48-SJ, San Jose, CA 95131-1706, USA]

510 views • 26 slides

PPR: Partial Packet Recovery for Wireless Networks

PPR: Partial Packet Recovery for Wireless Networks. Kyle Jamieson and Hari Balakrishnan MIT Computer Science and Artificial Intelligence Laboratory. (P1). Non-colliding bits. (P2). Non-colliding bits. Time. The problem. Lots of packets lost to collisions and noise in wireless networks.

332 views • 25 slides

Integrated Process Design

Integrated Process Design. Distillation Sequencing Simple Columns - Practical constrains - Heuristic rules - Minimum vapor flow - Components flow Complex columns - Columns with more than two products - Prefractionator - Thermal coupling. D. F. W. Simple columns.

470 views • 23 slides

Cellular Networks and Mobile Computing COMS 6998-8, Spring 2012

Cellular Networks and Mobile Computing COMS 6998-8, Spring 2012. Instructor: Li Erran Li ( lierranli@cs.columbia.edu ) http:// www.cs.columbia.edu /~coms6998-8 / 1 /23/ 2012: Cellular Networks : UMTS. Outline. Air interface Architecture. Standardization of WCDMA / UMTS.

264 views • 15 slides

Spread Spectrum Techniques for Wireless Communication

Spread Spectrum Techniques for Wireless Communication. Axel Acuna. Spread Spectrum. Methods by which a signal generated with a particular bandwidth is deliberately spread in the frequency domain, resulting in a signal with a wider bandwidth. These techniques are used for a variety of reasons:

387 views • 13 slides

802.11b Modulation Scheme

802.11b Modulation Scheme. Presented By: Nishant Divecha. Evolution of the 802.11b. Major Problems at the Physical Layer caused by nature of the chosen media that had to be addressed in 802.11b Bandwidth allocation; External interference; Reflection.

287 views • 12 slides