(2,1,1) convolutional code |solved problem |transform – domain approach
Q. Below figure depicts a rate ½, constraint length L = 1, convolutional encoder. Find encoder output using Transform – domain approach for input data: 11101
Transform domain approach
Convolution in time-domain = multiplication in spectral (frequency) domain. We can use this principle in the transform domain approach. The encoder output is obtained by the convolution of the input sequence with the impulse response of the encoder, hence the name convolutional code.
Two approaches can be used to find codewords in convolutional coding.
- Time domain approach
- D – Transform domain approach
Codewords obtained using the time domain approach and frequency domain approach produces same results.
