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MIMO is an upcoming wireless technology in which more and more data can be transmitted with the use of different antennas at transmitter and receiver end, at a same time. With this technique, it becomes possible to linearly increase the channel capacity and improve the signal quality with maximum data transmission having less BER. In most recent years, MIMO brings a new page to the history of wireless communication system where the spectral bandwidth is a precious commodity with greater efficiency. This innovative idea is the key for recent high speed Wi-Fi and 4G mobile systems that has transformed the era of wireless communication system. While transmission through channel, signal get exploited due to dispersion effect leading Inter symbol Interference. Equalizers are kind of filters that eliminate this effect at the receiver end in the communication system. In this paper, we discussed linear and non-linear equalizers for Frequency-flat fading and frequency-selective fading in Rician channel system using QPSK signal.