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Complexity Reduced Transmit Diversity Scheme for Time Domain Synchronous OFDM Systems
Zhaocheng WANG Jintao WANG Linglong DAI
Publication
IEICE TRANSACTIONS on Communications
Vol.E94-B
No.11
pp.3116-3124 Publication Date: 2011/11/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.3116
Print ISSN: 0916-8516 Type of Manuscript: PAPER Category: Terrestrial Wireless Communication/Broadcasting Technologies Keyword: transmit diversity, time domain synchronous OFDM (TDS-OFDM), channel estimation, cyclicity reconstruction, low complexity,
Full Text: PDF(783.7KB)>>
Summary:
This paper proposes a novel scheme to reduce the complexity of existing transmit diversity solutions to time domain synchronous OFDM (TDS-OFDM). The space shifted constant amplitude zero autocorrelation (CAZAC) sequence based preamble is proposed for channel estimation. Two flexible frame structures are proposed for adaptive system design as well as cyclicity reconstruction of the received inverse discrete Fourier transform (IDFT) block. With regard to channel estimation and cyclicity reconstruction, the complexity of the proposed scheme is only around 7.20% of that of the conventional solutions. Simulation results demonstrate that better bit error rate (BER) performance can be achieved over doubly selective channels.
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