Communication Engineering Laboratory
General information about the Laboratory: According to present curriculum B-Tech (ECE) 4th Semester & B-Tech (EE) 5th Semester Students perform experiments on Communication Engineering Laboratory.
Analog Communication Laboratory (EC 491)
Course Outcomes:
CO 1: Illustrate frequency versus amplitude characteristics of VCO.
CO 2: Identify the difference between waveforms of modulated signal of AM and FM.
CO 3: Prove and verify sampling theorem using PAM.
CO 4: Measure modulation index and sidebands power of AM and FM signal.
CO 5: Design circuit for Phase Locked Loop
Lists of experiments performed:
1. Measurement of modulation index of an AM signal.
2. Measurement of output power with varying modulation index an AM signal (for both DSB & SSB).
3. Measurement of distortion of the demodulated output with varying modulation index of an AM signal (for both DSB-SC & SSB).
4. Measurement of power of different frequency components of a frequency modulated signal & the measurement of the bandwidth.
5. Design and set up a PLL using VCO & to measure the lock frequency.
6. Design and set up a FM demodulator using PLL.
7. Measurement of SNR of a RF amplifier.
8. Measurement of selectivity, sensitivity, fidelity of a superheterodyne receiver.
9. One innovative experiment.
Lists of experiments performed beyond the syllabus:
1. Study the frequency modulation technique and measure the modulation index of FM signal.
2. Study the characteristics of PWM/PPM.
Digital Communication Laboratory (EC 592)
Course Outcomes:
CO 1: Illustrate Manchester line coding scheme.
CO 2: Identify waveforms of different digital modulation schemes.
CO 3: Examine time division multiplexing (TDM).
CO 4: Prove and verify sampling theorem using Pulse modulation.
CO 5: Design and implement 7-bit PN Sequence.
Lists of experiments performed:
Design, implementation and study of all the properties of 7-length and 15-length pn sequences using shift register.
Study of PAM and demodulation.
Study of PCM and demodulation.
Study of line coders: polar/unipolar/bipolar NRZ ,RZ and Manchester.
Study of delta modulator and demodulator.
Study of adaptive delta modulator and demodulator.
Study of BPSK modulator and demodulator.
Study of BFSK modulator and demodulator.
Study of ASK modulator and demodulator.
Study of QPSK modulator and demodulator.
Simulation study of probability of symbol error for BPSK modulation.
Simulation study of probability of symbol error for BFSK modulation.
Lists of experiments performed beyond the syllabus:
1. Study the Time Division Multiplexing and De-multiplexing (TDM).
2. Simulation study of probability of symbol error for QPSK modulation.
Facility available in the laboratory:
Communication Engineering laboratory focuses on training the students in both analog and digital transmission/reception of signal. The students here start in the analog area by constructing the circuits of amplitude modulation, frequency modulation and phase modulation. This laboratory provides hands-on practical training in the diversified fields of Analog & Digital communication, starting from the principles of modulation up to the recent concepts of Advanced Communication Systems. The laboratory consists of four workbenches each of which contains black & white display digital oscilloscopes, function generators, power supplies, multimeters, etc. All basic experiments can be performed related to analog and digital modulations, transmitters and receivers. Black & white spectrum analyzers are also available in the laboratory.
Major Equipment:
Digital Storge Oscilloscope (DSO), 50 MHz, 2 channels, 250MS/s
Digital Storge Oscilloscope (DSO), 25 MHz, 2 channels, 250MS/s
Cathod Ray Oscilloscope (CRO), 100 MHZ, 2 Channel
Cathod Ray Oscilloscope (CRO), 20 MHZ, 2 Channel
Cathod Ray Oscilloscope (CRO), 30 MHZ, 2 Channel
Spectrum Analyzer (Frequency Range 150KHz-1000MHZ)
Signal Generator 10 MHz, 2 Channel Output, Voltage ±10Vpp
Signal Generator 1 MHz, 1 Channel Output, Voltage ±15Vpp
DDS Signal Generator 1 MHz, 1 Channel Output, Voltage ±10Vpp
Distortion Meter