Combined beamforming with space-time block coding using double antenna array group

Performance of Layered Steered Space–Time Codes in Wireless Systems

“…Recently, many researches have focused on combining beamforming and STBC techniques [53,54,55]. The combining techniques usually require more than one AA at the transmitter.…”

“…One way to obtain the beamforming weights is through eigen decomposition of the estimated channel covariance matrix as in [53]. Another way is to utilize the direction of arrival information (DOA) to calculate the beamforming weights as conducted in [53,54]. In addition, a transmission scheme that effectively combines conventional transmit beamforming with orthogonal spacetime block coding was proposed in [56], in which the side information was utilized for improving a pre-determined orthogonal STBC by means of a linear transformation that leads to the optimal solution.…”

Combined Beamforming With Alamouti Coding Using Double Antenna Array Group for Multiuser Interference Cancellation

“…Because it is conflictive that the smart antenna works under high spatial correlated MIMO channel while the spatial diversity technique work under low spatial correlated MIMO channel. Recently, there are many researches focus on combining beamforming and STBC techniques [1][2][3]. The combining techniques usually require more than one smart antenna arrays at the transmitter.…”

“…The transmit signal is encoded by space-time block coding and precoded by beamforming weights independently before transmitting on different antenna arrays. One way to obtain the beamforming weights is through eigen decomposition to the estimated channel covariance matrix [1]; another way is to utilize the array response vector as the beamforming weights [2,3]. Combining beamforming and STBC is able to achieve both diversity and beamforming gain.…”

“…Specially, we consider the scenario where all the MSs transmit Alamouti STBC with two transmit antenna array groups to stable performance even with correlated channels [2] and the CSI of CCI is unknown to the receiver. Receive antennas are grouped into two subsets, A and B, each having K receive antennas.…”