The intelligent reflecting surfaces (IRS) can be implemented in radio systems in order to provide the cooperative communication services. In fact, the cooperative communication can increase the received signal strength at the communication receiver. Moreover, it can let transmitters send their signals with low power. The electromagnetic interference (EMI) can degrade the communication system performance. The total interfering power, affecting a communication system, can increase the bit error rate (BER). The large BER value is not good issue as it leads to a low system performance. Therefore, there should be tools and techniques in order to balance and compensate the existing BER. In fact, there are a lot of tools that can compensate the BER effect. We are concerned with the cooperative millimeter wave systems that are based on IRSs which are affected by EMI. Such systems have non-satisfied performance due to the high path losses as well as the existing EMI. These systems will be modeled and simulated. Furthermore, the space time block codes (STBC) are applied in order to compensate the bad performance of such systems. Really, the STBC codes can greatly compensate the bad effects of the high path loss as well as the large interference.