Receive Quadrature Reflecting Modulation for RIS-Empowered Wireless Communications

Receive Quadrature Reflecting Modulation for RIS-Empowered Wireless Communications
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接收正交反射调制以实现 RIS 赋能的无线通信

DOI:
10.1109/tvt.2021.3073161
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发表时间:
2021-04
影响因子:
6.8
通讯作者:
Gaojie Chen
Gaojie Chen
中科院分区:
计算机科学2区
文献类型:
--
作者:
Jing Yuan;Miaowen Wen;Qiang Li;Ertugrul Basar;George C. Alex;ropoulos;Gaojie Chen

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在本文中,我们提出了一种新的可重构智能表面(RIS)的调制方案,命名为RIS辅助接收正交反射调制(RIS-RQRM),借助于空间调制的概念。在RIS-RQRM中,整个RIS被虚拟地划分成两半以分别创建仅具有同相(I-)和正交(Q-)分量的信号,并且每一半形成到接收天线的波束,该接收天线的索引携带比特信息。此外,我们设计了一个低复杂度和非相干检测RIS-RQRM,它测量的最大功率和极性的I和Q分量的接收信号。推导了莱斯衰落信道下RIS-RQRM的近似误码率表达式。仿真结果表明,RIS-RQRM在低信噪比区域的误码率优于没有I/Q指数调制的现有同类方案。
In this paper, we propose a novel reconfigurable intelligent surface (RIS)-based modulation scheme, named RIS-aided receive quadrature reflecting modulation (RIS-RQRM), by resorting to the concept of spatial modulation. In RIS-RQRM, the whole RIS is virtually partitioned into two halves to create signals with only in-phase (I-) and quadrature (Q-) components, respectively, and each half forms a beam to a receive antenna whose index carries the bit information. Furthermore, we design a low-complexity and non-coherent detector for RIS-RQRM, which measures the maximum power and polarities of the I- and Q- components of received signals. Approximate bit error rate (BER) expressions are derived for RIS-RQRM over Rician fading channels. Simulation results show that RIS-RQRM outperforms the existing counterparts without I/Q index modulation in terms of BER in the low signal-to-noise ratio region.
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