A Decision-Directed Receiver for Alamouti Coded OFDM Systems

Jaekwon KIM  Robert W. HEATH, Jr.  Edward J. POWERS  

Publication
IEICE TRANSACTIONS on Communications   Vol.E86-B   No.10   pp.3141-3143
Publication Date: 2003/10/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technology
Keyword: 
Alamouti code,  decision directed,  transmit diversity (TD),  OFDM,  

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Summary: 
When the Alamouti code is applied (as a space-time block code) to an OFDM system with transmit diversity, the simple Alamouti decoding requires that each subchannel is flat-fading and constant over two symbol periods (Alamouti codeword period). The second requirement makes the Alamouti decoding scheme not suitable for time varying channels. In this Letter, we propose a new decision directed receiver to better accommodate time varying channels.