Discussion

Capacity of communication channel can be increased by :

(a) Decreasing signal to noise ratio
(b) Decreasing the bandwidth
(c) Decreasing the noise in channel
(d) Increasing signal to noise ratio

Codes :

Answer: D

Capacity is increased by (c) and (d).

By the Shannon-Hartley theorem the capacity of a channel is

\[ C = B \log_{2}\left(1 + \frac{S}{N}\right) \]

Decreasing the noise in the channel (c) and increasing the signal-to-noise ratio (d) both raise S/N and so raise C.

Decreasing the signal-to-noise ratio (a) or the bandwidth (b) lowers the capacity, so any option containing them is wrong.

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