Performance Analysis of STBC MIMO -OFDM Based WI-MAX for Various Equalizers to Reduce BER

Due to continually emerging demands of multimedia and internet services, in current years broadband wireless communication has gained attention. Wireless Communication mainly facing the main tasks of availability of resources like Bandwidth and transmission power, and also suffering from the problems of channel damages like fading and interference. Those problems can be avoided by using the Multiple Input Multiple Output (MIMO) and Orthogonal Frequency Division Multiplexing (OFDM) techniques. To increase the channel capacity and to maintain the high data rate mixture of (MIMO-OFDM) is implemented to offer a simple and high performance of the communication system. OFDM avoids inter-symbol interference (ISI) which is arise by synchronization error that degrades the signal performance. Parallel transmission is possible by OFDM and it uses the Wireless Interoperability for Microwave Access (WIMAX) on its physical layer. In adaptable WIMAX systems, MIMO techniques are prominent part in IEEE802.16e 2005 specifications. The objective of this paper is to reduce the bit error rate (BER) by placing the various equalizers at the receiver end simulation results verified by using MATLAB software.