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,  

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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.