Which two pieces of information are necessary to compute SNR? (Choose two.)

Question

Options

• AEIRP
• Bnoise floor
• Cantenna gain
• DRSSI
• Etransmit power

• A
  5% (1)
• B
  91% (20)
• E
  5% (1)

Explanation

SNR Calculation Explained

Signal-to-Noise Ratio (SNR) is calculated by subtracting the noise floor (B) from the received signal strength (RSSI) (D): SNR = RSSI - Noise Floor. RSSI represents the actual signal level received at the antenna, and the noise floor represents the background interference level - together they give you the ratio of useful signal to unwanted noise.

Why the distractors are wrong:

• EIRP (A) is the effective radiated power from the transmitter, but SNR is measured at the receiver, not the source
• Antenna gain (C) influences signal strength but is already factored into the RSSI measurement
• Transmit power (E) is also a transmitter-side value; signal degrades over distance, so transmit power alone doesn't tell you what signal actually arrives at the receiver

Memory Tip: Think of SNR like hearing someone talk in a noisy room - you need to know how loud their voice sounds to you (RSSI) and how loud the background noise is (noise floor). What the speaker's original volume was (transmit power/EIRP) doesn't matter - only what you actually receive compared to the noise around you.

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