Abstract

Error control, introduced in Chapter 13, adds redundancy, in the form of extra bits, and then uses that redundancy to correct errors introduced by the channel. There are shortcomings that we will address in this chapter: In typical applications, the extra bits either increase the bandwidth and the noise allowed into the receiver, or increase the number of bits per symbol. In the second case, the constellation minimum distance will be decreased or the average power increased. Convolutional and block codes specify how to generate redundant bits, but do not specify how to map the additional bits into data symbols.

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