''If I have seen further, it is by standing on the shoulders of giants.'' is very aptly described by Sir Isaac Newton. Ideas have given way to ideas. When Marconi invented wireless communication 100 years ago, we didn't know that one day life would seem impossible without it. It has penetrated every aspect of human life and given rise to endless demands on bandwidth and spectrum. And standing on the shoulders of giants, Teletar and Foschinig gave the MIMO system technique that would increase the spectral efficiency of the wireless system to its maximum compared to all current technologies. Multiple antennas are used for transmission and reception to increase the capacity of the wireless channel. Capacity is expressed as the maximum data rate achievable for an arbitrarily low error probability. This technology received a boost when TarokhEtA introduced its space-time trellis coding techniques and Alamouti introduced its space-time block coding techniques to improve performance at diversity-based links. Another boost came in the form of BLAST technology. But in this article, we will mainly focus on the MIMO wireless channel and how to determine its capacity under different conditions. And space-time blocks coding techniques. We will discuss the benefits of the topic covered and future prospects for improving the use of the limited available spectrum. MIMO Before we proceed with our discussion on MIMO antennas, we should know a little more about the multi-antenna system. Single Input-Output (SISO) is the well-known wireless configuration, Single Input-Single Output (SIMO) uses a single transmit antenna and multiple receive antennas, Single Output Multiple Input (MISO) has multiple antennas transmitting and a r ...... middle of article ...... for multi-antenna wireless systems without channel state information (CSI) at the transmitter also has been studied. The most important space-time block codes (STBCs) are orthogonal STBCs (OSTBCs) and the most popular OSTBC is the Alamouti code. The future research field includes simulation to obtain a quasi-orthogonal spatio-temporal block code having full diversity gain with full transmission rate. There should also be a research scope on developing an orthogonal space-time block code having full diversity gain with full transmission rate for more than two transmitting antennas. There should be more quasi-orthogonal space-time matrices for a large number of antennas at the transmitting and receiving antennas. Further research should be carried out to obtain the orthogonal space-time block code and quasi-orthogonal space-time block code which minimize the effect of fading..