Pilot Structure for High Data Rate in OFDM/OQAM-IOTA System
In this paper, the authors introduce a novel pilot structure for OFDM/OQAM system which has high spectral efficiency by Isotropic Orthogonal Transform Algorithm (IOTA) function. In contrast with classical OFDM/QAM transmission scheme, the OFDM/OQAM-IOTA system requires a specific pilot structure for channel estimation because side-lobe components of the IOTA function cause an intrinsic interference. In case of conventional pilot structure, successive signal cancellation and null insertion schemes are considered for minimizing the channel estimation error. These schemes, however, reduce overall data transmission rate, especially for frequent pilot transmission, and it results in decreased throughput.