Review and Analysis of Multiuser Detection Techniques for Smart Antenna of SDMA-OFDM.

Now days, the antennas which are mostly used at base station are either sectored or omni directional. But using such kind of antennas in the mobile communications is nothing but the wastage of power due to fact that most of the power is radiated in other directions rather than estimated mobile users. Also as the power is radiated in the other directions and this are results into the interference for the mobile users. Hence in this review paper we are discussing the smart antennas system by investigating performances of adaptive smart antenna with different adaptive equalizers. The Space-Division Multiple Access (SDMA) is nothing but the MIMO (multiple inputs and multiple outputs) communication mechanism for wireless networks. SDMA is having the potential of increasing the system performance as well as spectral efficiency. Generally, smart antenna is combining the multiple elements of antenna with the capability of signal processing in order to optimize automatically its radiation pattern in the mobile communications and against the signal environment. In this paper we are presenting the review and analysis of four type’s adaptive equalizers for multi-user system communication system for multi user detection using the adaptive smart antenna.