IMPROVEMENT IN BER PERFORMANCE BY MMSE EQUALIZER WITH MIMO OFDM

During the research equalizer is always a matter of strategies.When a signal is transmitted over a radio channel,it is subject to reflection,refraction and diffraction and also the type of modulation technique selected at transmitter.The communication environment changes quickly and thus introduce more complexity and uncrtainity to channel response.Ofdm is one of the best multiplexing technique which compensate intersymbol- interference as well as co- channel- interference.In wireless Communication ,scare resources and hence imposes a high cost on the high data rate transmission.fortunately,the emergence of multiple antenna system has opened another very resourceful dimension space,for information transmission in the air.It has been demonstrated that multiple antenna system provides very promising gain in capacity without increasing the use of gain,throughput,spectrum,reliability,and less sensivity to fading,hence leading to a breakthrough in the data rate of wireless communication system.Since than multiple input multiple output(MIMO) system has become one of the major focuses in the research community of wireless communication and information theory.The study of performance limit of information system become very important,since it gives a lot of insights in understanding designing the practical MIMO system.In order to observe the effect of multipath fading channel on the transmitted signal,a whole digital communication system simulator is developed.Ofdm along with MIMO strategies are very good to increase the capacity of the system and minimize to intersymbol-interference.MMSE equalizer under the multipath fading and MIMO strategy has improved Bit Error Rate Perfomence in this paper.