Novel Preamble-Based Channel Estimation for OFDM/OQAM Systems
2009 (English)In: 2009 IEEE International Conference On Communications , Vols 1-8, IEEE conference proceedings, 2009, 4135-4140 p.Conference paper (Refereed)
OFDM/OQAM has been considered as an attractive alternative to classic OFDM with cyclic prefix (CP) over doubly dispersive channels. By utilising well designed pulse shapes and removing CP, OFDM/OQAM has the advantage of reduced out-of-band energy and a theoretically higher spectral efficiency. However, channel estimation over doubly dispersive channels has been a big problem for OFDM/OQAM due to the non-orthogonality between the real and imaginary parts of its modulated signals. Therefore conventional channel estimation (CE) methods used for OFDM cannot be directly applied to OFDM/OQAM. Recently a preamble-based CE method - interference approximation method (IAM) - has been proposed to ease this task. By treating the intrinsic interference from neighbour symbols as known information, two heuristic preamble sequences have been constructed based on tentative observations, which turn out to be suboptimal. In this paper, we present a general theoretical framework for LAM preamble design and apply it to identify the optimal LAM preamble sequence which results in a higher gain. Numerical results have verified the effectiveness of the theoretical framework and a gain of 2.4 dB against CP-OFDM has been demonstrated with the new preamble in various doubly dispersive channels with a QPSK modulation.
Place, publisher, year, edition, pages
IEEE conference proceedings, 2009. 4135-4140 p.
IEEE International Conference on Communications, ISSN 1550-3607
IdentifiersURN: urn:nbn:se:kth:diva-29609DOI: 10.1109/ICC.2009.5199226ISI: 000280922202015ScopusID: 2-s2.0-70449511520ISBN: 978-1-4244-3434-3 (print)OAI: oai:DiVA.org:kth-29609DiVA: diva2:401644
2009 IEEE International Conference on Communications, ICC 2009; Dresden; 14 June 2009 - 18 June 2009
QC 201103032011-03-032011-02-112014-07-03Bibliographically approved