The over-sampling method is used for one of the blind channel estimation method. Applying TLS algorithm to this method, the estimation performance is high performance even if it is added noise to received signals as input signals into the estimation filter. However, if the impulse response of channel is long, we need large taps of FIR filter as the estimation filter. There by, if the taps of ... [Show full abstract] estimation filter are large taps, the convergence rate is slower. In addition, if the taps of estimation filter are small taps, the estimation performance is lower.