This paper evaluates the performance of space-time block codes (STBC) for wireless communication over Rayleigh fading channels using multiple transmit antennas. The authors introduce a new paradigm for transmission, where data is encoded using an STBC and split into \( n \) streams, each transmitted simultaneously from \( n \) antennas. The received signal at each antenna is a linear combination of the transmitted signals, corrupted by noise. Maximum likelihood decoding is achieved through decoupling the signals from different antennas, which simplifies the decoding process to linear processing at the receiver. The paper reviews encoding and decoding algorithms for various STBCs and provides simulation results demonstrating significant performance gains with minimal additional processing. The performance analysis shows that using multiple transmit antennas and STBCs can achieve remarkable gains, with the decoding complexity remaining low. The simulations confirm that the proposed codes provide substantial improvements in bit and symbol error rates, especially at low signal-to-noise ratios (SNRs). The paper concludes by discussing the potential for further performance enhancement by combining STBCs with outer trellis codes.This paper evaluates the performance of space-time block codes (STBC) for wireless communication over Rayleigh fading channels using multiple transmit antennas. The authors introduce a new paradigm for transmission, where data is encoded using an STBC and split into \( n \) streams, each transmitted simultaneously from \( n \) antennas. The received signal at each antenna is a linear combination of the transmitted signals, corrupted by noise. Maximum likelihood decoding is achieved through decoupling the signals from different antennas, which simplifies the decoding process to linear processing at the receiver. The paper reviews encoding and decoding algorithms for various STBCs and provides simulation results demonstrating significant performance gains with minimal additional processing. The performance analysis shows that using multiple transmit antennas and STBCs can achieve remarkable gains, with the decoding complexity remaining low. The simulations confirm that the proposed codes provide substantial improvements in bit and symbol error rates, especially at low signal-to-noise ratios (SNRs). The paper concludes by discussing the potential for further performance enhancement by combining STBCs with outer trellis codes.