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Unformatted text preview: he result might look
as shown in Figure 6-7.
6.5.1 Coping with Burst Errors Over many channels, errors occur in bursts and the BSC error model is invalid. For example, wireless channels suffer from interference from other transmitters and from fading,
caused mainly by multi-path propagation when a given signal arrives at the receiver from
multiple paths and interferes in complex ways because the different copies of the signal
experience different degrees of attenuation and different delays. Another reason for fading is the presence of obstacles on the path between sender and receiver; such fading is
called shadow fading.
The behavior of a fading channel is complicated and beyond the scope of 6.02, but the
impact of fading on communication is that the random process describing the bit error
probability is no longer independent and identically distributed. The BSC model needs to
be replaced with a more complicated one in which errors may occur in bursts. Many such
theoretical models guided by...
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This document was uploaded on 02/26/2014 for the course CS 6.02 at MIT.
- Fall '13