A novel channel estimation scheme for multicarrier communications with the Type-I even discrete cosine transform

In this work, the problem of channel estimation in multicarrier communications with the Type-I even discrete cosine transform (DCT1e) is addressed. A novel scheme, based on using the DCT1e, both at the transmitter and the receiver, is introduced. The proposed approach does not require adding any redundancy or knowing the exact length of the channel's impulse response. By constructing a symmetric training sequence at the transmitter with enough leading and tail zeros, we show that an accurate estimation of the channel's impulse response can be attained. Simulations using the ITU-T pedestrian channel B illustrate the good behavior of the proposed scheme in terms of reconstruction signal to noise ratio.