A novel time domain synchronous orthogonal frequency division multiple access scheme

Authors:
Linglong Dai;Jian Fu;Jun Wang;Jian Song;Zhixing Yang
Affiliations:
Tsinghua National Laboratory for Information Science and Technology, Electronics Engineering Department, Tsinghua University, Beijing, P.R. China;Tsinghua National Laboratory for Information Science and Technology, Electronics Engineering Department, Tsinghua University, Beijing, P.R. China;Tsinghua National Laboratory for Information Science and Technology, Electronics Engineering Department, Tsinghua University, Beijing, P.R. China;Tsinghua National Laboratory for Information Science and Technology, Electronics Engineering Department, Tsinghua University, Beijing, P.R. China;Tsinghua National Laboratory for Information Science and Technology, Electronics Engineering Department, Tsinghua University, Beijing, P.R. China
Venue:
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Year:
2009

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Abstract

Time-domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) outperforms cyclic prefixed-OFDM (CP-OFDM) in spectrum efficiency at the expense of higher complexity. Up to now, TDS-OFDM has only been used in unidirectional transmission, such as broadcasting applications. The overwhelming complexity of removing the implicitly superposed interferences between the PN sequences and IDFT information blocks, caused by multiple users, hinders the application of time-domain synchronous orthogonal frequency division multiple access (TDS-OFDMA) in multi-user communication scenarios. To solve this problem, this paper proposes a novel TDS-OFDMA scheme, including joint cyclicity reconstruction and joint channel estimation, utilizing the new "time-space two-dimensional frame structure". Theoretical analysis and computer simulation show that the proposed scheme not only can achieve the purpose of multiple access but also has an even better system performance Fin mobile environment than the conventional single-user TDSOFDM system.