Design and implementation of Fast Radix-2 and radix-4 ACSU with different adders in Viterbi decoder

Convolutional coding technique is used for unfailing data broadcast. Viterbi decoder is used to decode the data at the receiver end. In Viterbi decoder more time taking block is Add Compare and Selection Unit which depends on Branch metric and path metric values. In previous work Carry look ahead adder was used in ACS unit. In this paper Sparse Kogge Stone, Brent Kung, Knowles adders are used in ACS unit to achieve less time delay and low power consumption.