Alamouti-OFDM 2Tx 1Rx Implementation and Analysis

The Alamouti-OFDM 2Tx 1Rx system combines Orthogonal Frequency Division Multiplexing (OFDM) with Alamouti space-time coding to enhance wireless communication performance. The "2Tx 1Rx" designation indicates a configuration with two transmitting antennas and one receiving antenna. This setup improves signal diversity and reliability through space-time block coding techniques. Key implementation aspects include: - Alamouti coding algorithm that creates orthogonal transmission patterns across two time slots - OFDM modulation/demodulation using FFT/IFFT operations - Channel estimation and equalization techniques for single receive antenna systems - Maximum likelihood detection algorithm for symbol recovery The system achieves transmit diversity by transmitting complementary signal combinations from two antennas over consecutive OFDM symbols, effectively combating multipath fading without requiring multiple receive antennas. The core MATLAB implementation typically involves: - Generating Alamouti-encoded symbols using matrix operations - Applying OFDM modulation through IFFT on each antenna stream - Simulating wireless channel effects with Rayleigh fading models - Implementing combining and detection algorithms at the receiver This configuration significantly improves bit error rate performance compared to single-antenna systems while maintaining relatively simple receiver structure, making it suitable for practical wireless communication applications.