Performance analysis of mimo-of dm by using wireless communication system

Due to increasing in demand of faster data transmission speed in the future telecommunication systems, the multiple antenna systems have been actively investigated and successfully deployed for the emerging broadband wireless access networks. Multiple Input Multiple Outputs (MIMO) takes the advantage of multiplexing to increase wireless bandwidth efficiency and range. MIMO-OFDM is a technique to increase channel capacity without using additional transmit power or spectral bandwidth. MIMO-OFDM is an attractive air-interface solution for next generation wireless LAN’s, Wireless MAN’s & 4G mobile cellular wireless systems. The major drawback of MIMO is required higher amount of circuits. To avoid that drawback we use antenna selection technique. In this paper we are using three types of selection antennas. They are Optimal, ascending or descending and Orthogonal Space Time Block Code (OSTBC) antenna selection. Then we are investigating channel capacity with antenna selection. The channel capacity increases with the numbers of antennas added to the system due to the more diversity gain of alamouti code. Finally we evaluate BER performances of alamouti OSTBC scheme with antenna selection.