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Analyze various continuous and pulse wave modulation and Demodulation Schemes. Estimate the performance of Analog Communication System in the presence of noise. Identify different Radio receivers and understand the concept of coding schemes in Information theory.
Jun 17, 2014 · It begins with an introduction to communication systems and discusses analogue modulation techniques including AM, FM, and PAM. It then covers sampling systems, principles of noise, pulse code modulation, and digital communication techniques like ASK, FSK, and PSK.
Modulation involves multiplying the input signal x(t) by a cosine with a frequency f2. Demodulation involves multiplying the modulated signal again by a cosine with a frequency f2, and then applying a low pass filter with cutoff frequency f2. The low pass filter removes the high frequency components centered about 2f2. Figure 19 Modulation
- Elements of Communication System:
- Information source:
- Transmitter :
- Channel :
- Receiver:
- Signal, Message, Information
- Types of Signals
Communication: It is the process of conveying or transferring information from one point to another. (Or) It is the process of establishing connection or link between two points for information exchange. Elements of Communication System:
The message or information to be communicated originates in information source. Message can be words, group of words, code, data, symbols, signals etc.
The objective of the transmitter block is to collect the incoming message signal and modify it in a suitable fashion (if needed), such that, it can be transmitted via the chosen channel to the receiving point. Elements of Communication System:
Channel is the physical medium which connects the transmitter with that of the receiver. The physical medium includes copper wire, coaxial cable, fibre optic cable, wave guide and free space or atmosphere.
The receiver block receives the incoming modified version of the message signal from the channel and processes it to recreate the original (non-electrical) form of the message signal. Signal:
It is a physical quantity which varies with respect to time or space or independent or dependent variable. (Or) It is electrical waveform which carries information. Ex: m(t) = Acos(ωt+φ) Where, A= Amplitude or peak amplitude(Volts) w = Frequency ( rad/sec) φ = Phase (rad)
Analog or Continuous Signal Digital Signal Analog or Continuous Signal: If the amplitude of signal continuously varies with respect to time or if the signal contains infinite number of amplitudes, it is called Analog or continuous signal. Types of Signals Digital Signal: If the signal contains only two discrete amplitudes, then it is called digital...
Calculate the modulation index and percentage of modulation of an AM signal, given the amplitudes of the carrier and modulating signals. Define overmodulation and explain how to alleviate its effects.
Aug 1, 2017 · This document discusses amplitude modulation (AM) as a type of modulation used to transmit information signals. Modulation involves varying a high frequency carrier signal by an information signal in order to transmit the information signal over long distances.
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Public switched telephone network (PSTN), mobile telephone communication (GSM, 3G, 4G...), broadcast radio or television, navigation systems, ... The course is aiming at introducing fundamental issues required for understanding and designing a (digital) communication system.
