论文标题
使用智能反射表面无瞬时CSI进行机会主义波束形成
Opportunistic Beamforming using an Intelligent Reflecting Surface Without Instantaneous CSI
论文作者
论文摘要
尽管智能反射表面（IRS）辅助无线通信已经成为重要的研究范式，但渠道状态信息（CSI）的采集仍然是设计IRS相移并产生承诺的连贯的波束成绩收益仍然是一个至关重要的挑战。在本文中，我们提出了一个按比例公平计划下的IRS辅助的机会范围（OBF）方案，该方案不需要瞬时CSI来设计IRS参数。在缓慢的环境中，我们表明，只有在IRS上随机旋转，提出的方案可以利用多用户（MU）多样性效应，以便随着用户数量的增长而达到相干波束形成的性能。接下来，我们研究在确定性的束缚方案下，相关的瑞利快速褪色环境中，IRS辅助obf的总比例缩放量表，从而导致了相当大的总和率改进。
While intelligent reflecting surface (IRS) assisted wireless communication has emerged as an important research paradigm, channel state information (CSI) acquisition remains a critical challenge to design the IRS phase-shifts and yield the promised coherent beamforming gains. In this paper, we propose an IRS-assisted opportunistic beamforming (OBF) scheme under proportional fair scheduling, which does not require instantaneous CSI to design the IRS parameters. In a slow-fading environment, we show that with only random rotations at the IRS, the proposed scheme can capitalize on the multi-user (MU)-diversity effect to approach the performance of coherent beamforming as the number of users grows large. Next we study the sum-rate scaling of IRS-assisted OBF in the correlated Rayleigh fast fading environment under a deterministic beamforming scheme that results in a considerable sum-rate improvement.
