MIMO Wireless Channel and How to Determine Its Capacity Under Different Conditions

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‘‘If I have seen farther, it is by standing on the shoulders of giants.’’ is very truly coated by Sir Isaac Newton. Ideas gave way to idea. When Marconi invented wireless communication 100 years ago, we had no idea that one day life will seem to be impossible without it. It has penetrated each and every aspect of human life and has resulted into endless demands on bandwidth and spectrum. And by standing on the shoulders of giants, Teletarand Foschinigave the technique of MIMO system which would increase the spectral efficiency of the wireless system to its maximum compared to all the current technologies. Multiple antennas are used for transmission and reception to increases the capacity of the wireless channel.Capacity is expressed as the maximum achievable data rate for an arbitrarily low probabilityof error. Thistechnology received a fillip when TarokhEtA introduced their space-timetrellis coding techniques and Alamouti introduced his space-time block codingtechniques to improve link-level performance based on diversity. Another boost came in form of BLAST Technology. But in this paper, our focus will lie basically on the MIMO wireless channel and how to determine its capacityunder different conditions. And space-time blocks coding techniques. We will discuss the benefits of the topic discussed and future prospects to enhance the usage of limited available spectrum.

MIMO

Before we precede our discussion to MIMO Antennas, we should know a bit about Multi- Antenna System. Single-input single-output (SISO) is the well-known wireless configuration,single-input multiple-output (SIMO) uses a single transmitting antenna and multiplereceive antennas, multiple-input single-output (MISO) has multipletransmitting antennas and one r...

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...for wireless multiple-antenna systems without channel state information (CSI) at the transmitter has been also studied.The most prominent space-time block codes (STBCs) are orthogonal STBCs (OSTBCs) and the most popular OSTBC is the Alamouti code.The future research scope includes simulation to obtain quasi-orthogonal space time block code having full diversity gain with full transmission rate. There should also scope of research of developing orthogonal space time block code having full diversity gain with full transmission rate for more than two transmit antenna. There should be more number of quasi-orthogonal space time matrixes for large number of antenna at the transmitter and receiver antennas. There should be more research to obtain the orthogonal space time block code and quasi-orthogonal space time block code that minimize the effect of fading.

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