PERFORMANCE OF PILOT EMBEDDED OFDM S STEMS IN SIMULTANEOUS MULTI-USER TRANSMISSIONS

摘要

Recently pilot embedding has been proposed for MIMO sys terns to overcome the throughput limitation implied by the training sequences. The proposed scheme relies on the si multaneous transmission of the training sequence and the in formation bits. We propose to evaluate this new scheme in a multi user OFDM transmission system including synchro nization and channel estimation. The receiver uses an itera tive process to extract the informative bits that become train ing symbols for the channel estimation process. The packet error rate (PER) are evaluated and compared to the more clas sical preamble insertion and to the known channel cases.