Transmit Diversity Scheme for OFDM Systems Using the Odd DFT

Vicenc ALMENAR  Amparo GIRONA  Santiago FLORES  Jose MARIN-ROIG  

Publication
IEICE TRANSACTIONS on Communications   Vol.E94-B   No.8   pp.2411-2413
Publication Date: 2011/08/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.2411
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
OFDM,  transmit diversity,  odd-DFT,  

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Summary: 
A new transmission scheme for OFDM systems that uses the odd discrete Fourier transform to provide frequency diversity gain is proposed. Odd DFT allows the transmission of data subcarriers in frequencies that are centred between those employed by the traditional DFT. This fact is exploited to transmit data subcarriers on the group of frequencies that gives better performance using either traditional DFT or odd DFT. As an example, by using this approach a diversity gain up to 5.3 dB at a BER of 10-4 in a typical indoor channel model can be achieved.