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Achannel modelis a description of the probability of receiving a block ÿ when a block x is sent over the channel for all combinations of x and ÿ, we denote this by P(ÿx). There are many different types of discrete channel models, but not all of them are necessary to describe encoding and decoding for feedback systems. The actual models have two main applications. The first is to calculate theprobability of undetected errorP1ein some channel and the second to find thethroughput efficiencyfor a given code, decoding algorithm, and protocol for the information system with feedback. On the other hand, the purpose of any channel model is to give a simplified description of a real channel without losing any of its main properties.
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