This is to design a PSK (phase shift keying) system and assess the effects of number of constellation as well as communication channel.
(1) Use Simulink to design a Binary PSK (BPSK) communication system as in Figure 1.
binary source generator
PSK modulator
Channel
PSK demodulator
Figure 1
Use random binary source generator (you may use the source setup in your Lab 5 - Extra experiment) and AWGN (additive white Gaussian noise) as your channel effect. Use oscilloscopes and constellation maps to inspect the signals at right points of the system. Increase the noise level, draw the bit error rate (BER) versus signal to noise ratio (SNR), and specify at which noise level the demodulator is not able to recover the original signal accurately anymore. Draw your schematic and provide the constellation maps together with the input and output binary signals.
(ii) Use QPSK instead of BPSK in part (i). Demonstrate the results and compare it with those of BPSK. You may use the symbol rates similar to those suggested in the lab exercises.
(1) Use Simulink to design a Binary PSK (BPSK) communication system as in Figure 1.
binary source generator
PSK modulator
Channel
PSK demodulator
Figure 1
Use random binary source generator (you may use the source setup in your Lab 5 - Extra experiment) and AWGN (additive white Gaussian noise) as your channel effect. Use oscilloscopes and constellation maps to inspect the signals at right points of the system. Increase the noise level, draw the bit error rate (BER) versus signal to noise ratio (SNR), and specify at which noise level the demodulator is not able to recover the original signal accurately anymore. Draw your schematic and provide the constellation maps together with the input and output binary signals.
(ii) Use QPSK instead of BPSK in part (i). Demonstrate the results and compare it with those of BPSK. You may use the symbol rates similar to those suggested in the lab exercises.
