Performance Analysis of Different Modulation Schemes on Space Blocks Time Code (SBTC) for Multiple Antenna Systems

     Wireless networks are becoming part of everyday life. Wireless LANs, cell phone networks, and personal area networks are just a few examples of wireless networks widely used in our everyday lives. However, wireless devices are range and data rate limited.

The research community has spent a great deal of effort on finding ways to overcome these limitations. One method is to use Multiple-Input Multiple-Output (MIMO) links. The multiple antennas allow MIMO systems to perform precoding (multi-layer beam-forming), diversity coding (space-time coding), and spatial multiplexing. For the simulations, Simulink in MATLAB is used to show the simulation of two transmit antenna and one receive antenna. The Results and analysis for computing the Bit error rate (BER) for Binary Shift Keying (BSK) modulation in a Rayleigh fading channel with Alamouti space time block coding with two transmit and one receive antenna are shown. The constellation diagrams for various modulation techniques including Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK) 16 and 64 Quadrature Amplitude Modulations (QAM) are described. The result of the simulation shows that using multiple antennas during transmission reduces bit error rate when compared to single antenna systems.