A bandwidth efficient OFDM transmission scheme

In this paper, a new bandwidth efficient OFDM transmission scheme is proposed. A bandwidth efficient iterative scheme for OFDM systems without using cyclic prefix was proposed before [3] which works well when a channel does not have a deep spectral null. But such a frequency domain deep null is common in a wireless channel. A bandwidth efficient scheme proposed in this paper works well regardless of the existence of spectral null. In the proposed scheme, OFDM symbols are recovered in two steps. In the first step, only a small portion of the time domain OFDM symbol is recovered by the frequency domain 1-tap equalizer. In the second step, the recovered small portion and the tail part of the previous symbol are used for the cyclic reconstruction and tail cancellation. Simulation experiments are conducted to validate the proposed scheme.