Digital Revolution (Part III) - Error Correction Codes
3. The channel concept
One increasingly important aspect of the sending of information over a channel omitted from the diagram above is security. What good is it that one can accurately transfer money electronically between two banks if the message can be altered on the fly to divert the funds to some other bank or individual thief? Maintaining secure communications means that one has to use an encryption system of some kind along with all the other factors!
Using this approach, given that the string 0011 is sent, one can compute the probability that 1111 will be received, under the assumption that the transmission is modeled by a binary symmetric channel. Another model for a channel allows for the creation or erasure of symbols as a form of error. This is often referred to as the binary channel with erasure.
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