Abstract:

To improve the performance of detecting the transmitted sequence, the Viterbi algorithm (VA ) used in the multi-path channels was modified. The recursive metric equation was built and the renewed branch transition metric was given. The modified VA can estimate the channel information and detect the transmitted sequence simultaneously. Meanwhile, the channel information can be estimated by adaptive filter. The simulation results showed that the modified VA is near to the optimal algorithm, however, the its computational speed was faster than the optimal algorithm.

Key words: blind sequence estimation, cumulative metric, branch transition metric, modified Viterbi algorithm