Question

A channel has a 1-MHz bandwidth. The SNR for this channel is 63. What is the appropriate signel level?

(a) 2

(b) 8

(c) 4

(d) 16

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This interesting question is from Layers topic in division Cryptography Overview, TCP/IP and Communication Networks of Cryptograph & Network Security

Answer 1

The correct choice is (c) 4

To explain I would say: As a continuation to the previous question where we get the channel capacity as 6 Mbps. For better performance we choose 4 Mbps. Thus we calculate L from –

4Mbps = 2 x 1 MHz x logL.