SFBC Alamouti Scheme LTE A sentence I copied from book.

That a 2$\times$1 Alamouti SFBC is referred to as a rate 1 code, two symbols are sent over two adjacent subcarriers.

This question is regarding this SFBC encoder (Alamouti scheme). I understand how the encoder works for the two transmit antenna case. Below I briefly given an example for convenience. 

Assuming a BPSK modulator applied to data input $I$. Then we have

$I$ = 0 0 1 1 0 1 1 1 

BPSK symbols=  1 1 -1 -1 1 -1 -1 -1 

Then the output of the STBC encoder could be found according to the 

\begin{array}{lcr}
\mbox{$$} &amp; Antenna1 &amp; Antenna 2 \\
\mbox{$f_1$} &amp; s_1 &amp; s_2 \\
\mbox{$f_2$} &amp; -s_2^* &amp; -s_1^* \\
 \end{array}

and so applying this to the BPSK symbols I get the following symbols

Antenna1 symbols: 1 -1 -1 1 1 1 -1 1 

Antenna2 symbols: 1 1 -1 -1 -1 1 -1 -1

My question is next, what do we do with these symbols for LTE system ie OFDM modulation, do we send the symbols 1 and 2 over antenna 1 and antenna 2 respectively over the same subcarrier ? i.e I don't understand how transmission over subcarriers takes place? More precisely I don't undersatnd the assignement of the symbols to the different subcarriers?

Thank you.
The Alamouti scheme guards against Rayleigh fading channels.  If you were to send two symbols within the same channel within the same coherence time interval, they will experience the same fading.  In order to get diversity gain, you need to send them in different channels (different antennas or different frequencies or distant time slots)