'Direct sequence 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.

1.02k views • 63 slides

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

658 views • 47 slides

IEEE 802.11 Overview Mustafa Ergen ergen@eecs.berkeley UC Berkeley

IEEE 802.11 Overview Mustafa Ergen ergen@eecs.berkeley.edu UC Berkeley. Wireless Market Segments. Application. Presentation. ISO OSI 7-layer model. Session. IEEE 802 standards. Transport. Network. Logical Link Control. Data Link. Medium Access (MAC). Physical. Physical (PHY).

793 views • 42 slides

Spread Spectrum

Spread Spectrum. Chapter 7. Spread Spectrum. Input is fed into a channel encoder Produces analog signal with narrow bandwidth Signal is further modulated using sequence of digits Spreading code or spreading sequence Generated by pseudonoise, or pseudo-random number generator

842 views • 40 slides

ECE 4331, Fall, 2009

ECE 4331, Fall, 2009. Zhu Han Department of Electrical and Computer Engineering Class 25 Nov. 17 th , 2009. spread-spectrum transmission . Three advantages over fixed spectrum

1k views • 40 slides

884 views • 37 slides

Spread Spectrum

Spread Spectrum. Chapter 7. Spread Spectrum. Input is fed into a channel encoder Produces analog signal with narrow bandwidth Signal is further modulated using sequence of digits Spreading code or spreading sequence Generated by pseudonoise, or pseudo-random number generator

606 views • 33 slides

Wireless LANs and Introduction to IP

Wireless LANs and Introduction to IP. Slide Set 7. Wireless LANs. Wireless proliferating rapidly. IEEE 802.11 --> link access standard designed for use in a limited geographic setting. Various versions 802.11a, 802.11e, 802.11g, 802.11n. Physical layer evolution -- increased rates .

441 views • 31 slides

Lecture 10: Token Ring and FDDI Networks

Lecture 10: Token Ring and FDDI Networks. Homework for Chapter 2: All problems, particularly time lines for sliding window protocol Exam 2: October 16, 2000. Token Ring Review. Shared medium similar to ethernet Distributed algorithm controls transmission All nodes see all frames.

618 views • 31 slides

Code Division Multiple Access (CDMA) Transmission Technology

Code Division Multiple Access (CDMA) Transmission Technology. EE 578 Assignment #5 Mohammad Alkhodary 200806080. Outline. Introduction Direct Sequence Spread Spectrum (DSSS) Frequency Hopping Spread Spectrum (FHSS) Time Hopping Spread Spectrum (THSS)

939 views • 30 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

368 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

402 views • 28 slides

M. Alsafrjalani D. Dzenitis

360 views • 26 slides

Data and Computer Communications

654 views • 25 slides

Low Power Wireless Design

Low Power Wireless Design. Dr. Ahmad Bahai National Semiconductor. J/Bits/s/Hz. Bits/s/Hz. Design for worst case. Configurable Design. Hybrid. Centralized. New paradigm in Wireless. Power Efficiency. Configurability. Architecture. Distance to IP Network. TX Power. Data Rate.

364 views • 23 slides

Wireless LAN Technology

391 views • 19 slides

285 views • 19 slides

Wi- Fi LANs

352 views • 18 slides

King Fahd University of Petroleum and Minerals EE- 400 Communication Networks Wireless Industrial Networks (Wireless HAR

King Fahd University of Petroleum and Minerals EE- 400 Communication Networks Wireless Industrial Networks (Wireless HART) Prepared For Dr. Samir Ghadhban Done By Khalil Al-Saedi ID # 233263 Ali Al-Ojaimi ID # 233535. OUTLINES. INTRODUCTION

425 views • 15 slides

Stacy Drake Bluetooth Vs. Wi-Fi

Stacy Drake Bluetooth Vs. Wi-Fi. What is Bluetooth?. Bluetooth is define as a specification for the use of low-power radio communications to wirelessly link phones, computers and other network devices over short distances.

250 views • 9 slides