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Definition of "convolutional coding" |
a continuous error control coding technique in which consecutive information bits are combined algebraically to form new bit sequences to be transmitted. The coder is typically implemented with shift register elements. With each successive group of bits entering the shift register a new, larger set of bits are calculated for transmission based on current and previous bits. If for every k information bits shifted into the shift register, a sequence of n bits are calculated, the code rate is k/n. The length of the shift register used for storing information bits is known as the constraint length of the code. Typically, the longer the constraint length, the higher the code protection for a given code rate. |
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