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In the given context, the Alamouti 2x1 system is employed with QPSK modulation. This system is widely used in wireless communication to improve the reliability and performance of data transmission. It utilizes two antennas at the transmitter and one antenna at the receiver. By employing diversity techniques, such as space-time coding, the Alamouti 2x1 system can effectively combat fading and enhance the overall signal quality. With QPSK modulation, the system is capable of transmitting two bits per symbol, allowing for efficient data transfer. Overall, the combination of the Alamouti 2x1 system and QPSK modulation proves to be a robust and efficient solution for wireless communication applications.