Alamouti Coding is a spatial-time block code (STBC) which exploits the spatial diversity at the transmitter for a two-transmitter(antenna) system. It was proposed by Siavash M. Alamouti in 1998.
The transmitter output is given by the following equation:
where columns represent the transmit antennas and the rows represent time. s0 and s1 are two consecutive symbol inputs into the Alamouti encoder.
Space–time block coding is a technique used in wireless communications to transmit multiple copies of a data stream across a number of antennas and to exploit the various received versions of the data to improve the reliability of data-transfer.
Its most serious disadvantage is that all but one of the codes that satisfy this criterion must sacrifice some proportion of their data rate (see Alamouti'scode).
Alamouti invented the simplest of all the STBCs in 1998
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