New detection schemes for transmit diversity with no channel estimation

We present two new detection methods for the simple transmit diversity scheme proposed by Alamouti (see IEEE Journal on Selected Areas of Communications, Special Issue on Signal Processing for Wireless Communications, 1998). The new detection schemes require no channel state information at either the transmitter or the receiver. Using 2 transmit antennas and 1 receive antenna, the scheme provides a diversity order of two. Simulations have been included to show that the scheme has almost a 3 dB penalty compared to coherent detection