To provide the students with an opportunity to acquire knowledge, skill and attitude in the area of communication engineering with special emphasis on :
• Signals and systems
• Modulation and demodulation
• Radio transmitter and radio receiver,
• Telephone system,
• Transmission media,
• Digital data transmission,
Concept of basic communication system, Noise, Modulation/Demodulation, Radio transmitter and receiver, Shift keying, Telephone system, Transmission media, Digital communication, Data transmission,
1 Understand the signals and spectra
1.1 Describe electromagnetic wave and energy.
1.2 Describe the allocation of frequency bands for various communication system.
1.3 Explain the nature of different signals and their frequency ranges.
1.4 Define information.
1.5 Describe the basic building block of a communication system.
1.6 Define baud.
1.7 Describe bandwidth and information capacity.
1.8 Describe the factors affecting the channel capacity.
2 Understand the Noise in telecommunication system.
2.1 Define noise.
2.2 Mention the different types and sources of noise.
2.3 Describe the different noise.
2.4 Define Signal-to-Noise ratio.
2.5 Describe the noise figure.
3 Understand Amplitude modulation
3.1 Define modulation.
3.2 Mention the need for modulation.
3.3 Define Amplitude modulation.
3.4 Describe the basics of AM modulation.
3.5 Derive the expression of AM modulation.
3.6 Define modulation index and depth of modulation.
3.7 State the relative power distribution in carrier and side bands.
3.8 Solve problem related with band width and side band power
3.9 Describe the idea of DSB-SC, SSB-SC and V.S.B modulation.
4 Understand the frequency and pulse modulation
4.1 Define frequency modulation.
4.2 Describe the concept of frequency modulation
4.3 Derive the expression for frequency modulated wave.
4.4 Explain the FM spectra and bandwidth.
4.5 Describe the idea of modulation index, maximum frequency deviation and deviation ratio of FM wave.
4.6 State the method of generation of PPM, PDM and PWM signals
4.7 Describe the comparison of AM , FM and PM
5 Understand the feature of AM and FM modulator
5.1 Explain the basic operation of collector modulator, base modulator and balanced modulator.
5.2 Describe the principle of SSB-SC generation.
5.3 Mention the principles of operation of varactor diode modulator.
5.4 Mention the application of various modulator.
6 Understand the demodulation of AM waves
6.1 Explain the principle of operation of linear diode detector.
6.2 State the concept of diagonal clipping and empirical formula for RC time constant.
6.3 Understand the synchronous detector and PLL.
6.4 Explain the basic principle of PLL with block diagram.
7 Understand the demodulation of FM wave
7.1 Explain the basic principle of detection of FM wave.
7.2 List the methods of FM demodulation.
7.3 Describe the foster-Seeley discriminator and its working principle.
7.4 State ratio detector and its advantages over foster-Seeley discriminator circuit.
7.5 State the function of limiter circuit
8 Understand the Radio Transmitter
8.1 State the classification of radio transmitters in terms of power, frequency, modulation, service involved
8.2 Explain the block diagram of AM transmitter with function of each state.
8.3 State the difference between high level and low level modulation.
8.4 Explain the block diagram of stereo FM transmitter with resulting spectrum.
8.5 Explain the operation of SSB-SC transmitter with block diagram.
9 Understand the radio receiver
9.1 Describe briefly the operation of crystal, Tuned radio-frequency receiver and super receiver.
9.2 Explain the block diagram of super heterodyne AM radio receiver with function of each block and waveforms at input and output of each block.
9.3 Define the term frequency and Co channel interference
9.4 Explain the typical circuit of each block of super heterodyne receiver.
9.5 Explain a typical IC based AM and FM radio receiver circuit
9.6 Explain choice, alignment and tracking, IF and band switch of a radio receiver.
9.7 Explain the sensitivity, selectivity and fidelity.
10 Understand the feature of Telephone
10.1 Describe briefly telegraphy and telephony system.
10.2 Describe the working principle of telephone handset transmitter and receiver.
10.3 Define side tone.
10.4 Mention advantage and disadvantage of side tone.
10.5 Describe the tones used in automatic telephone.
10.6 Describe different type of dialing system .
10.7 Define the terms traffic, busy hour traffic unit, grade of service, availability and erlong’s formula.
11. Understand the concept of digital communication.
11.1 Mention the advantage of digital communication.
11.2 Describe the sampling theorem
11.3 Mention the types of sampling.
11.4 Describe the quantization & coding principle of PNM & PCM
11.5 Describe the functional diagram of PNM & PCM.
11.6 Describe the quantization noise, fold-Over noise, Interpolation Noise & error for PCM.
11.7 Explain the methods of reducing quantization noise, fold-Over noise and Interpolation noise.
12. Understand the modulation of digital data
12.1 Understand the modulation of binary data
12.2 Describe ASK, FSK and PSK
12.3 List the application of ASK, FSK and PSK techniques in analogue and data communication.
12.4 Explain the methods of quadrature amplitude modulation(QAM).
13. Understand the transmission media
13.1 Mention the categories of transmission media.
13.2 Describe the construction of twisted pair (UTP,STP), coaxial and fiber optic cable.
13.3 State the characteristics of twisted pair (UTP,STP), coaxial and fiber optic cable.
13.4 State the application field of twisted pair (UTP,STP), coaxial and fiber optic cable.
13.5 Advantages and disadvantages of each types of cables.
13.6 Describe the method of radio, microwave and infra red communication system.
13.7 State the characteristics of radio, microwave and infra red communication system.
1. Study the communication signals and spectra.
1.1 Select required equipment, tools and materials.
1.2 Set up the equipment for observing audio frequency signal
1.3 Observe amplitude, loudness, frequency, tone, wave, shape and sound quality.
1.4 Observe low frequency sine waves/square waves/triangular waves at different frequencies and note sound quality.
1.5 Note the relationship between bandwidth and sound quality.
2. Measure the modulation index for AM wave forms with different combination of modulating and carrier signals( at least four combination)
2.1 Select required circuit board , equipment, tools and materials.
2.2 Connect the circuit and equipment.
2.3 Input different modulating and carrier signals.
2.4 Make proper adjustments.
2.5 Record the required data.
2.6 Calculate modulation index for each set of data.
3. Study the working of a DSB modulator with and without carrier suppression.
3.1 Select required circuit board , equipment, tools and materials.
3.2 Setup the equipment for above conditions.
3.3 Observe the operation.
3.4 Observe the operation of carrier suppression on power efficiency
4. Study the working of Frequency modulation.
4.1 Select required circuit board , equipment, tools and materials.
4.2 Set up circuit board and equipment.
4.3 Input proper signals.
4.4 Make proper adjustments.
4.5 Observe FM wave.
5. Familiarize with the component layout and controls of popular radio receiver.
5.1 Select radio receiver, required equipment, tools and materials.
5.2 Observe different components and their layout.
5.3 Observe different control knobs.
5.4 Observe adjustment of different control knobs and the service.
6. Study the RF amplifier and converter stage of AM radio receiver
6.1 Select radio receiver, required equipment, tools and materials.
6.2 Identify the RF and converter stage in the circuit diagram and in the receiver.
6.3 Make the list of the components.
6.4 Trace the circuit in the receiver.
7. Study the IF and detector section of an AM radio receiver.
7.1 Select radio receiver, required equipment, tools and materials.
7.2 Identify the IF and converter stage in the circuit diagram and in the receiver.
7.3 Make the list of the components.
7.4 Trace the circuit in the receiver.
8. Study the audio stage of an AM radio receiver.
8.1 Select radio receiver, required equipment, tools and materials.
8.2 Identify the stage in the circuit diagram and in the receiver.
8.3 Make the list of the components.
8.4 Trace the circuit in the receiver.
9. Measure the DC and AC voltages at different points of a super heterodyne radio receiver.
9.1 Select radio receiver, required equipment, tools and materials.
9.2 Observe the circuit diagram and select the test points.
9.3 Measure the voltage at various points .
9.4 Prepare a voltage chart for observed voltage.
9.5 Compare the observed voltage with the given values in the diagram.
10. Demonstrate the process of alignment of AM radio receiver
10.1 Select AM radio receiver, required equipment, tools and materials.
10.2 Identify the components of alignment.
10.3 Process the alignment from output to input with half (middle) way setting.
10.4 Observe the tone.
10.5 Make realignment for better output.
11. Demonstrate the process of alignment of FM radio receiver
11.1 Select FM radio receiver, required equipment, tools and materials.
11.2 Identify the components of alignment.
11.3 Process the alignment from output to input with half (middle) way setting.
11.4 Observe the tone.
11.5 Make realignment for better output.
12. Study the operation of pulse code modulator
12.1 Select pulse code modulator and required tools and materials.
12.2 Identify different parts and note its function.
12.3 Input an analogue signal.
12.4 Observe the digital output.
12.5 Observe different operation of demodulator.
13. Study the operation of pulse code modulation
13.1 Select the circuit and required tools and materials.
13.2 Identify different parts and note its function.
13.3 Input pulse code (digital) signal.
13.4 Observe the analogue output.
13.5 Observe different process of operation.
14. Identify different types of guided communication media ( UTP, STP, Co-axial, fiber optic cable) , types of connectors and accessories used with them and observe their constructional features.
1. Electronic communication systems – William Schweber
2. Electronic communication systems – Kenedy, Devis
3. Electronic communication – Dennis Roody, John Coolen
4. Principles of communication engineering – Anok Singh & A.K Chhabara
5. Principles of telephony – N.N. Biswas
6. Digital Telephony – John Bellamy
7. Radio Engineering – G.K Mithal