A simple transmit diversity technique for wireless communications
Alamouti, S.M.
Selected Areas in Communications, IEEE Journal on
Volume 16, Issue 8, Oct 1998 Page(s):1451 - 1458
Digital Object Identifier   10.1109/49.730453
Summary:This paper presents a simple two-branch transmit diversity scheme. Using two transmit antennas and one receive antenna the scheme provides the same diversity order as maximal-ratio receiver combining (MRRC) with one transmit antenna, and two receive antennas. It is also shown that the scheme may easily be generalized to two transmit antennas and M receive antennas to provide a diversity order of 2M. The new scheme does not require any bandwidth expansion or any feedback from the receiver to the transmitter and its computation complexity is similar to MRRC

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