Digital Communication System || Communication Theory
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This document discusses digital communication systems. It introduces digital communication as a mode where information is encoded digitally and electrically transferred. It describes common digital communication techniques like digital transmission and radio. It outlines components of a digital communication system like channels, causes of signal loss, and compares advantages and disadvantages of digital and analog communication systems. In particular, it notes digital communication allows merging different data types, uses error correction, but requires larger bandwidth and synchronization is more difficult compared to analog systems.
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Hai I'm Senthilkanth, doing MCA in Mepco Schlenk Engineering College..
The following presentation covers topic called Wireless Communication and Networking
by WilliamStallings for BSc CS, BCA, MSc CS, MCA, ME students.Make use of it.
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by WilliamStallings Chapter : 2Transmission Fundamentals
Chapter 2
Electromagnetic Signal
Function of time
Can also be expressed as a function of frequency
Signal consists of components of different frequencies
Time-Domain Concepts
Analog signal - signal intensity varies in a smooth fashion over time
No breaks or discontinuities in the signal
Digital signal - signal intensity maintains a constant level for some period of time and then changes to another constant level
Periodic signal - analog or digital signal pattern that repeats over time
s(t +T ) = s(t ) -¥< t < +¥
where T is the period of the signal
Time-Domain Concepts
Aperiodic signal - analog or digital signal pattern that doesn't repeat over time
Peak amplitude (A) - maximum value or strength of the signal over time; typically measured in volts
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Rate, in cycles per second, or Hertz (Hz) at which the signal repeats
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Communication System (3).ppt
Digital communication systems have several advantages over analog systems:
1) Digital signals can be repeated without amplification, avoiding cumulative noise.
2) Digital error correction allows transmission over longer distances with better data integrity.
3) Digital techniques facilitate higher bandwidth and more efficient multiplexing of multiple signals.
ADVANCED TELECOM BSNL
This presentation provides an overview of advanced telecom technologies, including digital switching principles, fiber optics communication, mobile communication principles like GSM and CDMA, broadband DSL technologies, intelligent networks, ISDN, and next generation networks. It was presented by Ashish Nandan to the Department of Electronics and Communication Engineering at Future Institute of Engineering and Management.
Data Communications and Matlab
This document discusses digital communication and TCP/IP networks. It begins by introducing digital communication and some of its advantages over analog transmission, such as better noise immunity and support for encryption. It then discusses topics like harmonic distortion, signal-to-noise ratio, and bandwidth capacity based on Shannon's theorem. The document focuses on analyzing signal distortions in both the time and frequency domains using MATLAB simulations. Finally, it describes the role of the TCP protocol in providing reliable data transmission over IP networks according to the OSI reference model.
Multimedia multimedia over wireless and mobile networks
This document discusses multimedia over wireless and mobile networks. It begins by outlining the characteristics of wireless channels, including that they are more error-prone than wired channels. It then discusses various wireless networking technologies, including cellular networks from 1G to 4G, wireless local area networks, and Bluetooth. It concludes by discussing challenges for transmitting multimedia over wireless channels and techniques for error detection, error correction, and error concealment to address those challenges.
Channel Capacity and transmission media
Channel capacity depends on data rate, bandwidth, noise, and error rate. It can be calculated using the Nyquist bandwidth formula or Shannon capacity formula. Transmission media can be guided (wired) using twisted pair, coaxial cable, or optical fiber, or unguided (wireless) using radio waves, infrared, or microwave technology. Guided media provide a physical path while unguided media transmit through air using antennas.
Chapter 1.pptx
- The document discusses key concepts in wireless technologies including wireless transmission fundamentals, global cellular networks, broadband wireless, Bluetooth, and future trends such as WiMAX, Mobile-Fi, ZigBee, and Ultrawideband.
- It covers analog and digital signaling and transmission, channel capacity, advantages and disadvantages of wireless communication, and types of wireless communication systems including Bluetooth applications and usage.
Topics in digital communication
Digital Communication simply means devices communicating with each other in through digital signals. The signals are digitized and then the information is transferred through these digitized signals from source to destination.
But why Digital Communication or Digitization is needed?
Wireless communication and its standards
The document discusses wireless communication standards and cellular technology. It provides an agenda covering topics like wireless communication, cellular technology, standards evolution, modulation and multiplexing techniques, and cellular standards like GSM and CDMA. It also discusses frequency division multiple access (FDMA), time division multiple access (TDMA), code division multiple access (CDMA), and the differences between the 900MHz and 1800MHz frequency bands used in cellular networks.
Impact of channel in wireless communication
Wireless telecommunications involves the transfer of information between two or more points without a physical connection. It uses forms of energy like radio frequencies to transmit information over various distances, from a few meters to thousands of kilometers. While wireless operations allow for long-range communication without wires, the wireless channel is susceptible to factors like interference, path loss, and fading that restrict reliability and throughput. Adaptation techniques and MIMO can help improve performance but spectrum and interference remain limitations of wireless networks.
Mobile computing 98q76r876778787767.pptx
Mobile computing allows end users to access resources and information while mobile through technologies like internet access, mobile applications, and wireless communications. The history of wireless communication spans from the 1890s with the first wireless communication to current 5G networks. Wireless transmission involves communicating without a physical link by transmitting signals through air which are received by antennas.
Assignment05
This document is a course note on data communication that discusses baseband transmission, broadband transmission, and the differences between them. It also covers topics like twisted pair cables, transmission impairments including attenuation, distortion, and noise. Baseband transmission sends digital signals directly as voltage pulses using two separate circuits for bidirectional communication over short distances. Broadband transmission sends analog signals using multiplexed frequency bands over fiber optics or twisted cable for long-distance communication without attenuation. Transmission impairments degrade signals, with attenuation resulting in energy loss, distortion changing signal shape, and noise corrupting signals from sources like thermal effects and crosstalk.
DC NOTES.pptx
1. The document discusses the basic components and concepts of digital communication systems including transmitters, channels, receivers, transceivers, attenuation, noise, and types of electronic communication such as simplex, half-duplex, and full-duplex.
2. It also summarizes the basic blocks of a digital communication system including information sources, analog-to-digital conversion, source encoding, channel encoding, modulation, demodulation, channel decoding, source decoding, and digital-to-analog conversion.
3. The key advantages of digital communication over analog communication are discussed such as ease of regeneration, noise immunity, error detection and correction capabilities, ability to multiplex signals, security, and flexibility of the system
Introduction to communication systems
A brief discussion of Introduction to communication systems.
Prof. H.Amindavar complementary notes for the first session of "Advanced communications theory" course, Spring 2021
Atharva Digital Modulation Technique
The proposed modulation technique employs
quadrature mixing to achieve transmission of high frequency
data over a narrow channel. In this modulation technique, the
phase of carrier is varied in accordance with the instantaneous
amplitude of the message signal. The message data bits are
transformed to an unintelligible form which then modulates a
carrier signal. The modulation technique induces probabilistic
characteristic over the entire process. The nondeterministic
nature of data is enhanced and thereby providing integrity and
confidentiality to the data which is transmitted across a channel.
Another important feature of this technique is that prediction of
the message data bits by observing the modulated signal is foiled
due to the use of different phase shifts for 40 symbols. In this
technique, the spectrum of modulated signal is translated to be
centered at 0 Hz. At the demodulator, the instantaneous
amplitude and phase can easily be determined. The major
advantage of this digital modulation technique is that, signaling
rate, requirement of high frequency carrier and transmission
channel bandwidth is reduced to a considerable extent without
compromising the transmission capacity and data rate.
communication system ch1
This document provides an overview of a communication systems course taught by Ass. Prof. Ibrar Ullah. The course objectives are to develop basic concepts of communication systems using the textbook "Modern Digital And Analog Communication Systems". Students will be evaluated based on homework, tests, quizzes, and a final exam. Key topics covered include analog versus digital communication, modulation techniques, and the relationship between signal-to-noise ratio, channel bandwidth, and rate of communication.
Evolution of Wireless Communications
The document discusses the evolution of wireless communication technology. It covers topics like the electromagnetic spectrum, the need for modulation to increase communication range and allow multiplexing. Shannon's capacity theorem is discussed as it relates to the maximum data rate of a channel based on its bandwidth and signal-to-noise ratio. Spread spectrum techniques like CDMA are introduced which spread signals across frequency bands to make them resistant to noise and interference. Multiple access schemes like FDMA, TDMA, and CDMA are compared. OFDM is described as a digital multi-carrier technique using multiple subcarriers to transmit independent signals efficiently. Finally, the document outlines the generations of mobile communication technology.
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The document discusses the evolution of wireless communication technology. It covers topics like the electromagnetic spectrum, the need for modulation to increase communication range and allow multiplexing. The Shannon capacity theorem is discussed as it relates to the maximum data rate of a channel based on its bandwidth and signal-to-noise ratio. Spread spectrum techniques like CDMA are introduced which spread signals across frequency bands to make them resistant to noise and interference. Multiple access schemes to allow multiple users like FDMA, TDMA, and CDMA are covered. OFDM is summarized as a technique that uses multiple subcarriers to increase spectral efficiency. Finally, the generations of mobile communication standards are listed.
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Digital Communication System || Communication Theory
- 1. DIGITAL COMMUNICATIONSYSTEM Submitted By: Md. Nahid Hasan ID: 161001008 Dept.: EEE Course Code: EEE-307
- 2. INTRODUCTION Digital communication is a mode of communication where the information is encoded digitally as discrete signals and electrically transferred to therecipients. Digital communication is one of the most commonly used modes of communication nowadays.
- 3. Communication Techniques Digital communication covers a broad area of communication techniques including: • Digital transmission • Digital radio
- 5. ChannelsforDigital Communications TwistedPairCable Coaxial Cable Optical Fiber Microwave RF Satellite
- 6. • LossinSignaltoNoise Ratio: TheSNRcan be degrade into two ways. Through decreaseof desired signalpower. Through the increase of noisepower. • Bandlimiting Loss: The use of filters in the transmitter to avoid interfering with other channel reduces the amount ofenergy , result in signal loss. • DISTANCE: Thedistance is large is agreat chanceof signal distortion. Aswhen the distance is large we userepeaters to amplify the signal ,itamplifies the noise. CAUSESOFSIGNALLOSS
- 7. ComparisonsofDigitalandAnalogCommunicationSystems DigitalCommunicationSystem AnalogCommunication System Advantage: • inexpensivedigital circuits • privacypreserved(data encryption) • canmergedifferentdata(voice, videoand data) andtransmit over acommondigital transmission system • errorcorrection by coding Disadvantages : • Expensiveanalog components • noprivacy • cannotmergedatafromdiff. sources • noerrorcorrection capability Disadvantages : • largerbandwidth • synchronizationproblemisrelatively difficult Advantages: • smallerbandwidth • synchronizationproblemisrelatively easier