A Decision-Directed Receiver for Alamouti Coded OFDM Systems


Jaekwon Kim, Edward J. Powers, and Robert W. Heath Jr. 


IEICE Trans. Electron October, 2003.


  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.  


Space-time coding, decision directed, Alamouti scheme, OFDM, transmit diversity. 

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