Orthogonal Impulse Postfix OFDM Transmission for Efficient MIMO Channel Estimation

The estimation of channel state information in MIMO-OFDM systems is considered as a significant issue. In the conventional MIMO-OFDM systems, time divided or orthogonal pilot patterns are adopted to estimate the MIMO channel coefficients. However, the performance of the estimation sometimes becomes insufficient to make the full use of the MIMO benefits, especially under a fast varying channel environment. In the previous literature, the authors proposed a novel type of SISOOFDM system, denoted as Impulse Postfix OFDM (IP-OFDM), which inherently posses a superior channel estimation performance.