# Convolutional Encoder

The convolutional code shall encode the input bit sequence after appending 4 tail bits at the end of the sequence. Rate of the coder is R=½ with constraint length K=5. The encoder diagram and generating polynomials are shown below.

\begin{align} G_1(D) =& 1 + D^3 + D^4 \\ G_2(D) =& 1+ D + D^2 + D^4 \end{align}

The output from the encoder must be read alternately.

Figure 1 Convolutional encoder