In all practical communication systems, when a signal is transmitted from one point to another point, the signal is inevitably contaminated by random noise, i.e., the signal received is correlated with but possibly different from the signal transmitted. We use a noisy channel to model such a situation. A noisy channel is a “system” which has one input terminal and one output terminal1, with the input connected to the transmission point and the output connected to the receiving point. When the signal is transmitted through the channel, it is distorted in a random way which depends on the channel characteristics. As such, the signal received may be different from the signal transmitted.
KeywordsEntropy Verse Summing
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