Modulated by a digital modulation scheme such as

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modulated by a digital modulation scheme such as quadrature amplitude modulation or phase-shift keying. It displays the signal as a two- dimensional XY-plane scatter diagram in the complex plane at symbol sampling instants. As shown in figure 2, the yellow waveform is the binary input was multiplied to the sinewave (100 kHz) and the blue waveform was multiplied to the cosine wave (100 kHz). In this experiment, there are only four points in the constellation diagram because it only has two bits which means that it has four outputs with +1v at logic 1 and -1v at logic 0 as magnitude. Figure 3 is the constellation diagram of the QPSK by connecting the X and Y binary input to the X-Y function of the oscilloscope. The point at the first quadrant was achieved when both magnitude of the carriers is at logic 1 giving a +1v, the point at the second quadrant was reached when the magnitude of the sinewave is negative and the cosine wave is positive, the point at third quadrant was attained when the magnitude of the sinewave is negative and the cosine wave is negative, and lastly, the point at fourth quadrant was done when the magnitude of the sinewave is positive and the cosine wave is negative.
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Canaya, Regina Marie V.
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