ELEC3540 Analog and Digital Communications:BPSK Modulator

ELEC3540 Analog and Digital Communications:BPSK Modulator

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ELEC3540 Analog and Digital Communications

Question:

Laboratory Notes

The BPSK modulator whose block diagram for the carrier and the sequence generator as the message. Use the Buffer Amplifier to implement AMP and the inverter on the Digital Utilities module to implement — Ensure the Buffer Amplifier is set to have a unitary gain. Its only purpose in this experiment is to insert a phase change.

Laboratory 4: Digital Modulation

1. Equipment

o TIMS-301 with basic modules;

o Digital Oscilloscope with FFT capability;

o Your own USB flash drive to save waveforms (Note: the oscilloscope cannot handle flash drivers greater than 2GB);

2. To be completed before the LAB.

a) Considering a suitable input data, draw the waveforms for ASK, FSK and BPSK modulations.

b) Answer the following questions:

i) What will happen to the transmission bandwidth of ASK, measured in terms of the width of the main lobe of its spectrum, if Tb is reduced to the half of its earlier value?

ii) Can we perform the demodulation of BPSK using envelope detection? Why?

iii) How many line components (peaks) are there in the spectrum of ASK, FSK and BPSK signals?

3. Procedures

Part 1 — ASK modulation and demodulation

T1 — Patch up the model in figure 1, making sure that the output of the audio oscillator is a 8.33kHz sine wave. Use the SYNC output of the Sequence generator to synchronize the oscilloscope.

T2 — Save an oscilloscope screenshot showing the digital message and the ASK output.Notice that the digital message is the output “TTL X“ of the sequence generator.

T3 — Save the spectrum of the ASK output.

T4 — Design and implement an envelope detector.

T5 — Save the original and demodulated digital messages in the same oscilloscope screen. T6 – Patch up the model in figure 2 and adjust the variable DC source and the adder gains so the input X of the multiplier is a square wave with a 4V peak to peak and 2V mean.

T7 — Save an oscilloscope screenshot showing the digital message and the ASK output. T8 — Save the 

spectrum of the ASK output.

Ask modulator using a multiplier:

T9 — Use the envelope detector from step T4 to demodulate the ASK signal and save the original and demodulated digital messages in the same oscilloscope screen. Which modulator allowed a better message reconstruction? Why?

Part 2 — FSK modulation

T10 — Ensure the on-board SW2 switch in the VCO module is set to FSK and patch up the model in figure 3.

T11 — Save the digital message and the modulated signal in the same screenshot.

T12 — Adjust the horizontal control of the oscilloscope to be able to visualize the two frequencies of the modulated signal. Use the cursors to measure these frequencies and save the waveform.

T13 — Save the spectrum of the FSK modulated signal.

BPSK modulation

T 14 – Implement 

T16 — Save the digital message and the modulated signal waveforms.

T17 — Use the Horizontal control cf the oscilloscope o show clearly the phase change on the carrier when there is a logical transition in the message signal and save the waveform. T18 — Save the spectrum of the BPSK modulated signal.

BPSK demodulator.

Each student is required to hand in one report. The report must contain the following items:

a) Answers to the Pre-lab questions 

b) The plot of the waveforms asked on steps T2, T3, T5, T7, T8, T9, T11, T12, T13, T16, T17, T18, and T20. 

c) Sketch showing the modules and connections used in step T4, i.e. design the envelope detector used in this section. 

d) What were the carrier frequencies used in the 2 ASK modulators? Which one allowed the best message reconstruction? Why? 

e) What are the two frequencies observed in step T12? 

f)  Explain the shape of the FSK spectrum in step T13. What do you predict the frequencies of the two peaks of the spectrum to be? 

g) Why do the other spectrums not exhibit this shape seen in T13? 

h) Sketch the equivalent TIMS module setup used in T14 (see figure 4). Note: Please draw by hand or use a visual software. 

i)  Explain how the demodulator in figure 5, used to demodulate BPSK, works. 

ELEC3540 Analog and Digital Communications

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