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I. INTRODUCTI ON The Viterbi decoder algorithm proposed in 1967 by Andrew J. Viterbi is a decoding process for convolution codes in memoryless noise. Viterbi decoder algorithm is an exact recursive algorithm for finding the shortest path through a trellis, and thus is actually an optimum trellis decoder. it is capable of handling extremely high speeds (tens of megabits). In Mobile station baseband modem [3], the Viterbi decoder consumes more than one-third of the chip area and the power dissipation of the baseband modem Therefore, a low-power implementation of the Viterbi decoder is a significant practical matter. For viterbi decoder [10] there are two well known methods for survivor path storage and decoding, the Traceback method (TBM) and Register Exchange method (REM). In trace-back method, memory requirement is high. TBM is the preferred method used in Viterbi decoders having large constraint length and high performance. However, the TBM has drawbacks, which requires last-in-first-out (LIFO) buffer and has to use multiple read operations for high speed operation. This multiple operation results in complex control logic. The REM is logically simple,

Design of viterbi decoder using hybrid register exchange method for low power applications