'Spreading code' diaporamas de présentation

An Introduction to CDMA

1.02k views • 83 slides

An Introduction to CDMA

1.15k views • 83 slides

ii-1-PHY

ii-1-PHY. Taekyoung Kwon. Data vs. signal. Digital data vs. analog data Digital signal vs. analog signal Data are symbols like bits that have some info. A signal refers to physical representation of data, electrically or electromagnetically. signal.

692 views • 50 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

778 views • 47 slides

Data and Computer Communications

790 views • 47 slides

Spread Spectrum

Spread Spectrum. Session 5 Nilesh Jha. 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

769 views • 41 slides

Spread Spectrum Communication Systems

Spread Spectrum Communication Systems. Shemi / mesmarampally / sep 2012. Spread Spectrum Communications. A means of transmission in which the data sequence occupies a bandwidth in excess of the minimum bandwidth necessary to send it.

535 views • 38 slides

Spread Spectrum

Spread Spectrum. What is spread spectrum? .

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Baseband and Broadband

612 views • 35 slides

Spread Spectrum

Spread Spectrum. Chapter 9. Spread Spectrum. Can be used to transmit either a nalog or digital data Analog signal Spread data over wide bandwidth Makes jamming and interception harder Frequency hoping Signal broadcast over seemingly random series of frequencies Direct Sequence

838 views • 33 slides

CDMA-Based MAC Protocol for Wireless Ad Hoc Networks

505 views • 32 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

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

383 views • 28 slides

Chapter 13. Spread Spectrum

Chapter 13. Spread Spectrum. Park Dong-Hyun Department of Information and Communications Engineering The Graduate School of Sejong University. Contents. Spread Spectrum Principles Direct Sequence Spread Spectrum (DSSS) DSSS System Model Spreading Codes for ISI Rejection Synchronization

649 views • 27 slides

Chapter 7. Spread Spectrum

Chapter 7. Spread Spectrum. Wen-Shyang Hwang KUAS EE. 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

492 views • 27 slides

Topic 6 Spread Spectrum

Topic 6 Spread Spectrum. Spread Spectrum. Analog or digital data Analog signal Spread data over wide bandwidth Makes jamming and interception harder Frequency hoping Signal broadcast over seemingly random series of frequencies Direct Sequence

509 views • 27 slides

Spread Spectrum

Spread Spectrum. Spread data over wide bandwidth Makes jamming and interception harder Frequency hoping Signal broadcast over seemingly random series of frequencies Direct Sequence Each bit is represented by multiple bits in transmitted signal Chipping code. Spread Spectrum Concept.

625 views • 26 slides

Spread Spectrum Technology

Spread Spectrum Technology. What is Spread Spectrum(SS). Spread Spectrum (SS) technology was first introduced by military as a way of sending secure communications.

538 views • 25 slides

Lecture 12

Lecture 12. Time Division Multiplexing Statistical Time Division Multiplexing Statistical Multiplexing Gains Wave Division Multiplexing Code Division Multiplexing. Many Lines. Fewer Trunks. Statistical Multiplexing. Many input lines are multiplexed into a few trunks

523 views • 25 slides