Integrating Orthogonal Frequency Division Multiplexing [ Ofdm ] And Multiple Input Multiple Output [ Mimo ] as Joint Transmission Scheme

Wireless medium is a hostile propagation medium suffering from multipath fading and interference from other sources. Time Diversity and Frequency Diversity provide provides effective methods to mitigate fading and interference, this improving link robustness. Spatial Diversity provides link reliability without compromising on spectral efficiency. Space-time-coding provides potentially increased robustness and capacity by exploiting the fact that multiple antennas can be used in both transmitting and receiving equipments. This spatial multiplexing technique is termed as Multiple-Input-Multiple-Out [“MIMO”]. Most of the previous work in the area of “MIMO” wireless has been restricted to narrowband systems. Orthogonal-Frequency-Division-Multiplexing [“OFDM”] significantly reduces receiver complexity in wireless broadband systems. The use of “MIMO” technology in combination with “OFDM” seems to be an attractive solution for future broadband wireless systems. This paper is aimed at looking at possible integration of “MIMO” with “OFDM” and establishing improvements it has to offer for wireless networks. Various schemes that employ multiple antennas at the transmitter and receiver are being considered to improve the range and performance of communication systems. [Syed Ahsan, Muhammad Shahbaz, Syed Athar Masood. Integrating Orthogonal Frequency Division Multiplexing and Multiple Input Multiple Output as Joint Transmission Scheme. Journal of American Science 2011;7(7):24-27]. (ISSN: 1545-1003). http://www.americanscience.org.