Channel Estimation Based on the Discrete Cosine Transform Type-III Even

In this work, we address the problem of channel estimation in multicarrier communications. We present a procedure which employs the Type-III even DCT (DCT3e) at both the transmitter and the receiver. By using any symmetric training symbol we show how to estimate the channel's impulse response without a prior knowledge of its exact length. Theoretical results are provided in order to guarantee the validity of the proposed technique, whereas simulations illustrate the good behavior of the proposed estimation algorithm.