Noise in Communication.
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The document is a presentation on noise in communication. It defines noise as a random signal that interferes with the message being transmitted in a communication system. It describes two types of noise: external noise caused by outside factors and internal noise caused by the receiver. The effects of noise are that it can prevent the receiver from understanding or properly functioning, reducing the efficiency and performance of the communication system. Methods for reducing noise discussed include encoding/decoding techniques, error detection and removal, using filters, ensuring proper wiring, and keeping wires away from electrical machinery.
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Noise in Communication System
1) Noise exists in all communication systems and degrades signal quality. It is caused by random movement of electrons and can be internal or external.
2) Thermal noise, also known as Johnson noise, is generated by thermal agitation of electrons in conductors. It is proportional to temperature and bandwidth.
3) Noise figure and noise temperature are used to measure the degradation of signal to noise ratio caused by components in a communication system. Lower noise figure and temperature indicate less degradation.
Noise in communication system
The document discusses different types of noise that affect communication systems, including thermal noise, shot noise, flicker noise, excess resistor noise, and popcorn noise. It provides details on thermal noise generation and its relation to temperature and resistance. The analysis section examines thermal noise in resistors in series and parallel and defines signal-to-noise ratio and noise factor. Additive white Gaussian noise is described as noise that is additive, has a constant spectral density (white), and has a Gaussian amplitude distribution.
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3. Design of microwave filters including the insertion loss method, filter responses for low pass filters, impedance and frequency scaling, and applying the techniques to different filter types like low pass, high pass, band pass and band stop filters.
Noise
Thermal noise is random voltage fluctuations generated within electrical components due to the thermal motion of charge carriers like electrons. The three main types of internal noise are thermal noise, shot noise, and flicker noise. Thermal noise, also called Johnson noise, arises from the random thermal motion of electrons in electrical conductors. Its spectral density is flat and does not depend on frequency. Shot noise results from the discrete nature of electrical current in components like diodes and transistors. Flicker noise, also known as 1/f noise, increases at lower frequencies and its source is not fully understood. External noise sources include atmospheric noise from lightning, solar noise from the Sun, and industrial noise from electrical equipment.
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Noise in Communication System
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Noise
Thermal noise is random voltage fluctuations generated within electrical components due to the thermal motion of charge carriers like electrons. The three main types of internal noise are thermal noise, shot noise, and flicker noise. Thermal noise, also called Johnson noise, arises from the random thermal motion of electrons in electrical conductors. Its spectral density is flat and does not depend on frequency. Shot noise results from the discrete nature of electrical current in components like diodes and transistors. Flicker noise, also known as 1/f noise, increases at lower frequencies and its source is not fully understood. External noise sources include atmospheric noise from lightning, solar noise from the Sun, and industrial noise from electrical equipment.
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Noise in Communication.
- 1. COURSE NAME : COMMUNICATION THEORY. COURSE TEACHER: MD. AMINUL ISLAM. DATE : 06-12-2018 WELCOME TO MY PRESENTATION
- 2. PRESENTED BY Name: Md:Ashraful Alam Bhuiyan ID:163010131 Department of Electrical and Electronics Engineering
- 3. PRESENTATION TOPIC NOISE IN COMMUNICATION
- 4. What Is Noise? Noise is a random signal that exists in a communication system. Noise is anything that interferes with the message.
- 5. TYPES OF NOISE • External (caused by neither the sender or receiver) also known as channel noise. • Internal (caused by receiver) also known as psychological noise.
- 6. EFFECT OF NOISE • The receiver cannot understand the sender. • The receiver cannot function as it should be. • Reduce the efficiency of the communication system. • Degrade system performance for both analog and digital system.
- 7. REDUCE NOISE IN COMMUNICATIONS • Special encoding and decoding techniques used to optimize the recovery of the signal. • Proper error detection method and then steps to remove that errors. • Filters are used to exclude unwanted bandwidth from a signal. • Proper Connecting Wires can reduce the level of noise. • Keep the wires away from electrical machinery. • Ensure all technology works effectively.
- 8. REFERENCES • Wikipedia • http://visual-memory.co.uk • https://www.csun.edu/ • https://www.ics.uci.edu • Electrical Communications: Theory, worked examples and problems Book by R. G. Meadows