'Frequency hopping spread spectrum' diaporamas de présentation

Digital Modulation Schemes

Digital Modulation Schemes. transmitter. receiver. Transmission . Modulation. Amplitude Modulation. Double Sideband Spectrum. QPSK modulation. In Practice. RZ and NRZ Line Codes & spectra. Nyquist Pulses for zero-ISI. Raised Cosine Spectrum. Spectrum of Raised Cosine pulse.

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Lecture 2 Wireless Environment and Wireless LANs

Wireless Networks and Mobile Systems. Lecture 2 Wireless Environment and Wireless LANs. Lecture Objectives. Discuss the impact of the wireless environment on networks Explain the concept of spread spectrum, widely used in WLAN technologies

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Industrial Wireless Solutions

Industrial Wireless Solutions. Agenda. Introduction Products & Specs Applications. Introduction to wireless. Imagine. Introduction to wireless. Imagine. Introduction to Wireless. Conventional Monitoring Conditions Long conduit runs between sensors and control room

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Wireless Networks

Technical University of Cluj-Napoca Group 3250. Wireless Networks. Cluj-Napoca, 24 Nov. 2003. Authors: Marius Popovici Daniel Cri?an Zagham Abbas. Presentation Outline. Wireless Technology overview The IEEE 802.11 WLAN Standards Secure Wireless LANs

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15-441 Computer Networking

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15-446 Distributed Systems Spring 2009

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Overview of Wireless Networks

Overview of Wireless Networks. Anuj Puri. Outline. Projections of wireless growth Cellular Networks Wireless LANs and Bluetooth WAP Ad Hoc wireless networks. HUGE EXPECTATIONS AND INVESTMENT IN M-DATA. European UMTS spectrum auctions $ Billions. Millions of subscribers worldwide.

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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Narrow Band PHY Prop

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Narrow Band PHY Proposal for 802.15.4g] Date Submitted: [10 March 2009] Source: [Cristina Seibert] Company [Silver Spring Networks] [Benjamin A. Rolfe] Company [Blind Creek Associates]

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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Narrow Band PHY Prop

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Narrow Band PHY Proposal for 802.15.4g] Date Submitted: [10 March 2009] Source: [Cristina Seibert] Company [Silver Spring Networks] [Benjamin A. Rolfe] Company [Blind Creek Associates]

528 views • 43 slides

Principles of Spread Spectrum

Principles of Spread Spectrum. Lecture 4. 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

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Welcome

If there were no errors, the receiving radio sends an acknowledgement packet (ACK) to the ... Each radio frequency packet you send over a Locus radio is encrypted, ...

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CHAPTER 5

CHAPTER 5. WIRELESS COMMUNICATIONS. Introduction. Wireless Communications system in which electromagnetic waves carry a signal through atmospheric space rather than along a wire

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S-72.227 Digital Communication Systems

S-72.227 Digital Communication Systems. Spread spectrum and Code Division Multiple Access (CDMA) communications. Spread Spectrum Communications - Agenda Today. Basic principles and block diagrams of spread spectrum communication systems Characterizing concepts

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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

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Wireless Networking IEEE 802.11 Standards Module-03B

Wireless Networking IEEE 802.11 Standards Module-03B. Jerry Bernardini Community College of Rhode Island . Presentation Reference Material. CWNA Certified Wireless Network Administration Official Study Guide (PWO-104), David Coleman, David Westcott, 2009, Chapter-5

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Wireless Networking IEEE 802.11 Standards Module-04A

Wireless Networking IEEE 802.11 Standards Module-04A. Jerry Bernardini Community College of Rhode Island . Presentation Reference Material. CWNA Certified Wireless Network Administration Official Study Guide (PWO-104), David Coleman, David Westcott, 2009, Chapter-5

411 views • 27 slides

Data and Computer Communications

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Bluetooth

Bluetooth. Introduction Why Bluetooth History The Bluetooth Technology The Bluetooth Stack Bluetooth in ad hoc networks. Introduction. Why Bluetooth? Cable replacement between devices. Supported by major companies. Open Specification Low power consumption

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Fundamental of Wireless LAN

Fundamental of Wireless LAN. Radio Waves IEEE 802 Families Appenidx (Infrared and Carrier Currents LANs). Wireless LAN Configuration. Radio-Based Wireless LANs. Most widely used method Adv: penetrating walls and other obstacles with little attenuation.

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Advantages of TSMP

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