Sm. Alamouti, A SIMPLE TRANSMIT DIVERSITY TECHNIQUE FOR WIRELESS COMMUNICATIONS, IEEE journal on selected areas in communications, 16(8), 1998, pp. 1451-1458
This paper presents a simple two-branch transmit diversity scheme. Usi
ng two transmit antennas and one receive antenna the scheme provides t
he same diversity order as maximal-ratio receiver combining (MRRC) wit
h one transmit antenna, and two receive antennas. It is also shown tha
t the scheme may easily be generalized to two transmit antennas and M
receive antennas to provide a diversity order of 2M. The new scheme do
es not require any bandwidth expansion any feedback from the receiver
to the transmitter and its computation complexity is similar to MRRC.