Example 2.3


Question 2.12
Question 2.13

 



The Shannon–Hartley Theorem: Graphical representation

 

The Shannon–Hartley theorem clearly shows that bandwidth efficiency can be traded for power efficiency, and vice-versa.

It is important to note that the Shannon Capacity theorem assumes that the noise present with the signal is Additive White Gaussian Noise. This is often a valid assumption, particularly if the operating bandwidth is small compared with the channel center frequency.

In practice, no implementation of a digital communication system can reach the performance suggested by the Shannon equation, and most fall short by 3 dB or more. Results for some common modem types are given in Chapter 6.