Alamouti coding

Alamouti Coding is a spatial-time block code (STBC) which exploits the spatial diversity at the transmitter for a two-transmitter system. It was proposed by Siavash M. Alamouti back in 1998.

The output out of the transmitter is given by the following equation:

<math> s= \begin{bmatrix} s_0 & s_1 \\ -s_1^* & s_0^* \end{bmatrix} <math>

where columns represent the transmit antenna and the rows represent time. <math>s_0<math> and <math>s_1<math> are two consecutive symbol inputs into the Alamouti encoder.