Performance of pilot embedded OFDM systems in simultaneous multi-user transmissions

Recently pilot embedding has been proposed for MIMO systems to overcome the throughput limitation implied by the training sequences. The proposed scheme relies on the simultaneous transmission of the training sequence and the information bits. We propose to evaluate this new scheme in a multi-user OFDM transmission system including synchronization and channel estimation. The receiver uses an iterative process to extract the informative bits that become training symbols for the channel estimation process. The packet error rate (PER) are evaluated and compared to the more classical preamble insertion and to the known channel cases.