State-diagram description of convolutional
Operation of a convolutional encoder can be described by a state
diagram. The state of the encoder is defined as the content of it's
Fig. 1 State diagram of a (2,1,2) convolutional
encoder given in Fig. 2, less. 1.
Consider the encoder of the (2,1,2) convolutional
code given in Fig. 2 less. 1. The
state of the encoder is the content of the 2-stage shift register,
hence the encoder has four states. The four states are labeled S0,
At the time unit i the state is represented
In Fig. 1 the four states are
denoted by S0=(00),
Figure 1 demonstrates the encoder's operation
for the duration of the first ten clock cycles tabulating the input
bits, the shift register states, and the corresponding output bits.
(We would certainly agree that S0=(00),
and S3=(11). In such convention
we have a different trellis, but the convolution code features are
Please, find the encoder structure for above state-diagram
with out simulation tool.