COMMUNICATION ENGINEERING (CSE405)
UNIT1-Analog Communication :
Amplitude Modulation : Need to modulate definition, Carrier, Sidebands, Modulation factor and percentage Modulation, Power in carrier and sidebands,Modulated wave form, generation of Double side band (DSB) and single side and (SSB).Brief Description with block diagram of an AM transmitter.
UNIT2-AM Radio Receiver :
Demodulator : Square law deleetor, Concept of hetero dyning, Block Schematic diagram and operational description of an AM receiver, sensitivity, selectivity and Fidelity of a receiver. Qualitative idea about IF freq, Local OSC, IF stage and output audio stages
UNIT3-Frequency Modulation principles :
Definition, Modulated wave, Frequency Deviation % Modulation, Bandwidth, & Spectrum of FM wave. Armstrong method of Generation of FM wave.Brief description about FM transmitter
UNIT4-FM Receivers :
Detection of FM wave, the Discriminator, Qualitative Description of different stages of an FM receiver. Comparison of AM and FM systems
UNIT5-Telegraphy :
Nodes – Morse, cable, 5 unit &7 unit code and their uses, speed of working band, Manual Telegraphic System, Principles of Carrier Telegraphy.Telegraph Instruments : Mouse key (single current), double current key, PBO secounder polarised and non-polarised telegraph relays
Teleprinter : Principles of working, Construction of Teleprinter, transmitter receiver, automatic Telex system (Principle of working).Line Testing : Murray & Verleyloop tests, Principles of carrier telegraphy.
UNIT6-Telephone :
Telephone Instruments : Subscriber Telephone apparatus and accessories, Receiver, Transmitter, magnetic generator, Hay's transmission bridge, working principles of manual exchange High grade Communication Receivers (Modular block diagram & working principles Study of frequency synthesiser, phase locked loop, VCD digital read out, different types of filters and detectors.Noises in receivers and their reduction.Principles of VHF receivers, Digital discriminator, selective calling circuit. Automatic Telephones : Principles of multi exchange, Intercensing, Telex & RTTTU
UNIT7-Digital Modulation Techniques :
Principle of Sampling, Quantization, pulse code modulation (PCM). Frequency shift Keying (FSK) and phase shift key in (SK)
UNIT8-Digital Communication :
Data forms, VRF System : (Simplex, half duplex, duplex communication) Transmission Mode between statious. Networks : Point to point, star, Ring, Bus. Data Communication systems Block schomatic Description. Brief Introduction to Time Division Multiplexing, freguency Division Multiplexing principle under hyginsynchronom and Asynchronoum transmission. Moderns Low speed modems, Medium speed modems and High speed Modems concept and need for protocols.A brief Introduction to Fiber optic communication system and satellite communication system. An introductory description of Mobile communication. Antenna – Basic principles
PRACTICAL :
LIST OF EXPERIMENTS
1.To study the amplitude modulation and demodulation technique.
2.To study the frequency modulation and demodulation technique.
3.To study the frequency spectrum of AM and FM with the help of spectrum analyzer.
4.To study the analog signal sampling and reconstruction of the effect of: —
(a) different sampling frequencies on reconstructed signals;(b) varying duty cycle of sampling frequency on the amplitude of reconstructed signal.
5.To study some radio receiver measurements: (a) sensitivity, (b) selectivity and (c) fidelity.
6.To study EPABX:
(a )to study the electrical behaviour of different tones – dial tone, ringing tone, ring back tone and busy tone (both subscriber and exchange);
(b) to study some extension features-redial, burgling, extension privacy, call forwarding, follow me etc.
REFERENCE BOOKS:
1.Data Communication and Networking – by B.A. Forouzan TMH
2.Principles of Communication Systems – by H. Taub, D.L. Schilling, G. Saha, TMH
3.Digital and Analog Communication System – by L.W. Couch, Pearson Education
4.Radio Antenna and Propagation – by W. Gosling, Newsnes
1.Communication Electronics by Frenzel,Tata McGraw-Hill
2.Electronic Communication System by Kennedy, Tata McGraw-Hill
3.Principles of Communication System by Taub& Schilling, Tata McGraw-Hill
4.Electronic Communication by Roddy&Coolen, Prentice Hall of India, N. Delhi
5.Communication System by Simon Haykin, WI Ltd.
6.Telemetry Principles by D. Patranabis, Tata McGraw-Hill
7.Electronic Communication System by Dungan, Vikash Publishing House