Effect of imperfect amplitude estimation on the performance of hybrid interference cancellation

The impact of imperfect amplitude estimation on interference cancellation is addressed in this study. Several parameters are discussed such as position of training sequence, influence of Doppler frequency and symbol rate. It is shown that, when using linear interpolation, the idea of splitting the training sequence into 3 parts as a pre-/ mid-/ post-amble allows the evolution of the channel to be followed with greater accuracy than in the case of mid-amble only. In addition, for fast fading rate channels, the idea of processing the estimates in two different lines is introduced and improves estimation. The conclusion is that linear interpolation can offer a solution for the channel estimation required by interference cancellation, combining very low complexity and very good channel tracking capability even at relative high vehicular speeds.