Figure 8

BER performance comparisons of different methods with respect to the method proposed which employs polynomial curve fitting whose orders are selected adaptively in senario 2 for different mobile speed values. Note that the performance of the method proposed exhibits a staircase-like behavior over the SNR values that correspond to the order shifts which can also be cross-checked with the points given in Figure 6. M1: the proposed method which is LS estimate is obtained from the pilots for the CFR used with the Kalman filter and then linear interpolation is used for symbols in between. M2: frequency-domain LS is used.