An intelligent reflecting surface (IRS)-assisted millimeter-wave (mmWave) massive multiple input multiple output (MIMO) system with transmit antenna selection (TAS) using orthogonal space-time block codes (OSTBC) scheme is proposed in this paper. This system combines TAS and IRS with hybrid analog-digital beamforming (HBF) for 60 GHz mmWave communications in order to exploit the benefits of TAS, OSTBC, analog beamforming (ABF), and transmit digital precoding techniques. The proposed system, however, benefits from the transmit diversity gain of OSTBC scheme as well as from the signal-to-noise ratio (SNR) gains of both the beamformer and the IRS technology. The simulation results demonstrate that TAS-OSTBC system with zero-forcing precoding technique outperforms the conventional TAS system with OSTBC scheme. Furthermore, the bit error rate (BER) performance significantly im-proves as the number of antenna array elements increases due to providing a beamforming gain. In addition, increasing the number of reflecting elements further enhances the error performance. It is also found from the simulation results that the TAS-OSTBC system with hybrid precoding has better BER performance than that of TAS-OSTBC with ABF, and IRS-assisted systems significantly outperform the conventional systems without the IRS technology. This makes the proposed IRS-assisted system an appealing solution for internet-of-things (IoT) networks.
翻译:本文建议采用智能反射表面(IRS)辅助毫米波(mmWave)大规模多输入多输出输出系统(MIMO),使用正方空时区代码(OSTBC)传输天线选择系统(TAS)和IRS混合模拟数字波束(HBF),用于60GHZ毫米波形通信,以便利用TAS、OSTBC、模拟波形成型(ABF)的好处,并传输数字预编码技术。然而,拟议的系统得益于使用正方空时区代码(STS)传输天线选择(TAS)系统的多样性增益,以及来自光源和IRS技术的信号对音比对音比对调率(SS)的增益。模拟结果表明,TAS-OS-STBC系统与常规系统前的性能分析结果越强。