Discussion
Three schemes are compared for the same message bandwidth.
| Scheme | Parameter varied | Noise immunity |
|---|---|---|
| PAM | Amplitude | Poor |
| PWM | Duration | Good |
| PPM | Position | Good |
Which conclusion follows from the table?
Answer: B
Reading down the table, the two schemes holding amplitude constant are the two with good immunity, which identifies the mechanism rather than merely ranking the schemes. Duration is a varied parameter rather than a lever on immunity, the bandwidth is held equal across the comparison, and narrowing the pulses would not remove amplitude modulation's dependence on amplitude. A table read for the property the winners share is more informative than one read as a ranking.
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