What is adaptive viterbi decoder?

Answer 1

In recent years, the addition of systematic redundancy to the transmitted information in the form of error-control coding has proved to be a potential way to overcome channel disturbances that produce errors, in digital communication systems. However, with the evolution of error-control codes such as the convolutional codes, the complexity of the corresponding decoders has also been increasing. The function of such a decoder is to find a codeword that most closely resembles the received input sequence. The Viterbi algorithm (VA), which is one of the most extensively employed decoding algorithms, works well for codes with short constraint length K. But its memory requirement and number of computations poses a big obstacle when decoding codes with larger constraint lengths. In order to overcome this problem the concept of adaptive Viterbi decoding algorithm (AVA) was developed .

In this project a modified Adaptive Viterbi Algorithm has been designed. As in the Adaptive Viterbi algorithm , the modified algorithm also does not examine all possible states of the trellis levels, thus reducing the memory, computational, and power requirements.