Using LMS weighting values as the channel state information for OFDM based systems

In this paper, the Viterbi decoder with aided channel state information (CSI) for OFDM based system is investigated. The CSI is obtained from the weighting values of one-tap frequency domain LMS equalizers on different subcarriers. Comparing to the conventional soft decision Viterbi decoding, the proposed method has better performance due to the different reliabilities. In the simulations, we also compare the circumstances with various CSI sources. By keep updating weighting values, we could observe that the proposed method gains the better performance in contrast to other manners. In addition, the time-average method is used to estimate the CSI more precisely