Quality improvement of a mimo radio link using spatial diversity technique-in the context of Bangladesh

Abstract

The demands for wireless communication services are growing at a rapid rate. Meeting these demands is challenging since the availability of the radio spectrum at the frequencies of interest is limited. Furthermore, wireless communications also must cope with several other difficulties such as multiple access interference (MAl), channel fading, and limitations on the power and size of the mobile terminals. In this Project, we demonstrated the problems of multiple access interference and channel fading in wireless communications and focus on a particular technique that recently received enormous attention, namely MIMO system considering spatial diversity technique. In this research work first a mathematical model of Multi - path fading is presented to analyze the parameter of the model. This model is used to determine the overall probability of fade depth in a specific link. A Layered space-time architecture for wireless communication in flat Raleigh fading environment with multiple antennas is designed. It demonstrated that when the fading coefficients are statistically independent and known at the receiver, the capacity of the link increases linearly with the increased number of transmit and receive antennas.