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Subject: Digital Communication
Year: II
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Semester: VI
Prepared by: E Gayathri
Updated on: 23/03/
Unit - I: Signal analysis
- Write short notes on complex fourier spectrum.
- What is fourier transform and how fourier transform are used in real time applications, explain with examples.
- State and prove the properties of fourier transform.
- State and prove sampling theorem.
- Define noise. Explain the various types of external and internal noise.
- Define cross correlation and auto correlation and discuss their properties.
- Explain the concept of PSD of a random process and derive the relation between PSD and power and PSD
- State and prove the properties of power spectral density.
- What are advantages and disadvantages of fourier transform?
- Write in brief about random signals.
- Define correlation of a signal.
- Define fourier transform and give the formula for fourier and inverse fourier transform of a signal.
- Explain the concept of fourier transform for periodic signals.
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Unit - II: Digital communication systems
- Draw the block diagram of a digital communication system and explain each block in detail.
- Define amplitude modulation and derive the time domain equation for an AM wave.
- Give a detail account on the classification of pulse modulation techniques.
- Explain in brief about the generation and demodulation of PPM signals.
- Define PCM. Explain coding and decoding of PCM signal with block diagram.
- Explain delta modulation with block diagram.
- Describe adaptive delta modulation with block diagram and wave forms.
- Explain the process of quantization with suitable waveforms.
- Explain amplitude shift keying modulation and demodulation with diagram.
- Explain the function of a QAM coherent demodulator and draw its block diagram.
- Explain in brief about Quadrature amplitude modulator.
- Write a short notes on the following
- BPSK Signal
- BPSK modulator
- Coherent BPSK demodulator
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- Compare ASK, FSK and PSK.
- Write a short notes on,
- BFSK signal
- BFSK modulator
- Coherent BFSK demodulator
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- What are advantages and disadvantages of FSK?
- With the help of a block diagram explain base band binary data transmission system.
- Draw the block diagram of base band communication receiver and explain the importance of each block.
- What are the types of digital modulation techniques? Explain briefly
- Define coded communication and list its types.
- With neat diagram explain the modulation and demodulation of pulse width modulation.
- Explain quantization noise.
- What are advantages and disadvantages of ASK?
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Unit - III: Error detection and coding
- Explain the error detection using parity bit.
- Explain the cyclic redundancy check method of error detection.
- Explain how hamming code is useful for correcting and detecting the errors using an example.
- Generate the hamming code for the data 1110001100
- Write a short notes on cyclic codes.
- Draw and explain different ways of representing binary data by electrical signals.
- Discuss Walsh coded in detail.
- Define error detection and error correction.
- List different error detection and correction techniques.
- Define
- Hamming code
- Hamming weight
- Hamming distance
- Minimum hamming distance
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- State data encoding and list different analog to digital signal encoding schemes.
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Unit - IV: Case studies
- Write a short notes on paging systems.
- Draw and explain the block diagram of basic cellular system.
- Explain the process of call progress in a cellular telephone system.
- Write short notes on global positioning system.
- Discuss in detail about the segments of GPS.
- Explain GPS receiver.
- Describe principle of operation of fax system.
- Write a short notes on video text.
- Write the advantages ,disadvantages and application of paging system
- What are the advantages and disadvantages of cellular telephone systems.
- Discuss the merits and demerits of FAX machines.
- List out advantages and disadvantages and applications of video text.
- Mention the merits, demerits and applications of GPS:
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