In this work, the performance analysis of a wireless communication is done by modeling a wireless communication system and analysing its bit error rate (BER). The BER of any communication system is helpful for it performance analysis. So, the consequences of multiple antenna system on BER at receiver end is analysed and maximal ratio combining (MRC) is also estimated between signal and noise. Therefore, the BER is attempted to reduce in the wireless communication system which can affect to receive the pure signal in the receiver.