We consider a wireless communication system, where a transmitting source is assisted by both a reconfigurable intelligent reflecting surface (IRS) and a decode-and-forward half-duplex relay (hybrid IRS-relay scheme) to communicate with a destination receiver. All devices are equipped with multiple antennas, and transmissions occur in two stages. In stage 1, the source splits the transmit message into two sub-messages, transmitted to the destination and the relay, respectively, using block diagonalization to avoid interference. Both transmissions will benefit from the IRS. In stage 2, the relay re-encodes the received sub-message and forwards it (still through the IRS) to the destination. We optimize power allocations, beamformers, and configurations of the IRS in both stages, in order to maximize the achievable rate at the destination. We compare the proposed hybrid approach with other schemes (with/without relay and IRS), and confirm that high data rate is achieved for the hybrid scheme in case of optimal IRS configurations.
翻译:我们考虑的是无线通信系统,在该系统中,传输源得到一个可重新配置的智能反射表面(IRS)和一个解码和前向半双式继电器(混合IRS继电器计划)的辅助,以便与目的地接收器进行通信。所有设备都配备了多天线,传输分两个阶段进行。在第一阶段,发送源将传送信息分成两个子信息,分别传送到目的地和中继,使用区块二进制分解以避免干扰。两种传输都将受益于IRS。在第二阶段,中继器重新编码接收的子消息并将其(通过IRS)转发到目的地。我们优化了两个阶段的IRS的电力分配、光束和配置,以便最大限度地提高目的地的可实现率。我们将拟议的混合方法与其他计划(有/没有中继器和IRS)进行比较,并确认混合计划实现了高数据率,以优化IRS配置。