A suboptimal sequence estimation scheme employing a survivor-correction Viterbi algorithm

This paper proposes a survivor-correction Viterbi algorithm (SCVA) in order to improve the bit error rate performance of decision feedback sequence estimation (DFSE) in the presence of widespread intersymbol interference. The SCVA can mitigate erroneous survivor selections due to DFSE, because it modifies the add-compare-select operation to an add-correct-compare-select operation. In addition, its complexity is independent of the delay of the main delayed ray. Finally, computer simulation confirms that the performance of the SCVA is superior to that of DFSE at the same number of states, especially in the non-minimum phase condition