Alamouti coding 2X1 and 2X2

http://spacetimecodes.blogspot.com/p/alamouti-code.html

The codes:
http://spacetimecodes.blogspot.com/p/alamouti-code-for-2-transmiters-and-1.html
http://spacetimecodes.blogspot.com/p/alamouti-code-2x2-matlab-code.html