The source-channelcoding problem for point-to-point communications is reviewed. This is first done with a critical eye on the separation principle. It is pointed out that when we design a system according to the sepa...
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The source-channelcoding problem for point-to-point communications is reviewed. This is first done with a critical eye on the separation principle. It is pointed out that when we design a system according to the separation principle we end up with and end-to-end map which is essentially deterministic. It is indeed the fact that this map is deterministic what makes it inevitable that the separation principle leads to long codes and thus large delays. It is pointed out that in some applications we don't need or even don't want deterministic mappings. When this is the case one can go beyond the separation principle and aim at systems that have smaller (or eve zero) delay. This is obtained by matching the source and the channel in a probabilistic way. A speculative example suggested by biological communications is given.
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