Space-Time Block-Coded OFDM-ll Combine space-time block code with oFDM to achieve spatial diversity gain over frequency selective fading channels In effect, apply space-time coding on blocks of data symbols instead of individual symbols Space-time encoder takes two data vectors x(n) and X(n+1)and transmits Antenna #1: X X(n+) Antenna#2: X(n+1) X(n) Georgia Institute of Technology Center for Signal and Image ProcessingGeorgia Institute of Technology Center for Signal and Image Processing Space-Time Block-Coded OFDM - II • Combine space-time block code with OFDM to achieve spatial diversity gain over frequency￾selective fading channels. • In effect, apply space-time coding on blocks of data symbols instead of individual symbols. • Space-time encoder takes two data vectors X(n) and X(n+1) and transmits Antenna #1: X(n) -X* (n+1) Antenna #2: X(n+1) X* (n)