問題：
What is convolutional coding?
答案：
Convolutional coding involves the data stream to be transmitted via satellite (DVB-S) which is loaded bit by bit into shift registers. The data which is split and delayed as it is shifted through different registers is combined in several paths. This means that double the data rate (two paths) is usually obtained. Puncturing follows to reduce the data rate: the time sequence of the bits is predefined by this coding and is represented by the trellis diagram.
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