問題文
Two identical clients sit in a straight office corridor with nothing between them and the access point. The second client is exactly twice as far away as the first. Counting only free space path loss how much weaker is the signal at the second client?
選択肢
- Weaker by about 6 dB because free space path loss grows with the square of the distance and the received power therefore falls to a quarter.
- Weaker by about 12 dB because the path loss doubles twice and the extra distance here costs the same again.
- Both clients read the same level because they stay inside one 30 m cell and the loss is equal there.
- Weaker by about 3 dB because doubling the distance halves the received power and halving the transmit power does the same.