Multiple choice

A modem constellation diagram has data points at (0, 1) and (0, 2). What type(s) of modulation does the modem use?

  1. Phase modulation

  2. Amplitude modulation

  3. Both A and B

  4. None of the above

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The constellation points (0, 1) and (0, 2) have the same phase (90 degrees) but different amplitudes (1 and 2). Therefore, the modulation is Amplitude Shift Keying (ASK).