Three time-domain adaptive schemes including time-variance convergence parameter blind LMS(TVCPBLMS)

time-variance convergence parameter soft decision weight blind LMS(TVCPBLMS) and time-variance convergence parameter ideal decision weight blind LMS(TVCPBLMS) based on wireless mobile communication OFDM systems for channel estimation are proposed.These novel schemes could trace adaptively the channel characteristic through time-variance convergence parameter and decision weight.Simulation showed that the novel schemes had better performances with high accuracy and fast converges than those of the blind LMS method

especially via different time delay spread

time and Doppler frequency.Furthermore

these schemes are not only suitable in wireless mobile communication systems to estimation channel characteristic but also suitable in radar and spaceflight to estimation the other characteristic parameters.