ABSTRACT
Digital signal modulation is a technique of transforming binary data into a continuous signal so that it can be carried by the signal carrier in a certain band-pass channel. There are several digital signal modulation techniques that are often used, these are Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), and Quadrature Amplitude Modulation (QAM) and are simulated in this study using Matlab® Simulink. Two parameters are employed to compare the performance of five signal modulation techniques through a multipath Rayleigh fading channel, they are Bit Error Rate (BER) and the Power Spectral Density (PSD). The simulation results show that, in terms of bit error rate, BPSK has the lowest rate (2.75e-5), followed by QAM (2.81e-5), QPSK (2.61e-3), 16-QAM (2.72e-3) and 16-QPSK (6.34e-3). In terms of power spectral density, 16-QPSK ranked first with (55.508 dBm), BPSK came second (55.561 dBm), followed by QPSK (59.589 dBm), then QAM (66.436 dBm), and finally 16-QAM (89.722 dBm).
