A Simple Adaptive Switching Scheme between STBC-OFDM and SFBC-OFDM Systems

Keonkook LEE  Youngok KIM  Joonhyuk KANG  

Publication
IEICE TRANSACTIONS on Communications   Vol.E92-B   No.11   pp.3546-3549
Publication Date: 2009/11/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.3546
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
space-time/frequency block code (STBC/SFBC),  OFDM,  adaptive switching,  

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Summary: 
In this letter, we propose a simple adaptive switching scheme to enhance the performance of space-time/frequency block coded OFDM systems (STBC/SFBC-OFDM). Since STBC-OFDM and SFBC-OFDM undergo severe performance degradation in time- and frequency-selective fading channels, respectively, performance enhancement can be achieved by switching between STBC-OFDM and SFBC-OFDM over a continuously varying channel environments. Thus, a new switching scheme based on the characteristics of the actual channel is proposed. The effectiveness of the proposed scheme is demonstrated by computer simulations.