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首页> 外文期刊>Wireless Communications Letters, IEEE >Opportunistic Beamforming Using an Intelligent Reflecting Surface Without Instantaneous CSI
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Opportunistic Beamforming Using an Intelligent Reflecting Surface Without Instantaneous CSI

机译:使用智能反射表面而没有瞬时CSI的机会主义的波束成形

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摘要

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 letter, 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.
机译:虽然智能反射表面(IRS)辅助无线通信已成为一个重要的研究范式,但是频道状态信息(CSI)获取仍然是设计IRS相移的关键挑战并产生承诺的相干波束形成增益。在这封信中,我们提出了一项在比例公平调度下的IRS辅助机会主编(OBF)方案,这不需要瞬时CSI来设计IRS参数。在一个缓慢衰落的环境中,我们表明,只有在IRS中只随机旋转,所提出的方案可以利用多用户(MU) - Diversity效果来处理相干波束成形的性能,因为用户数量变大。接下来,我们在确定性的波束形成方案下研究IRS辅助OBF在相关的Rayleigh快速衰落环境中的SUM速率缩放,从而导致相当大的总和改善。

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