Fluid Antenna Enabling Secret Communications

Fluid Antenna Enabling Secret Communications
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流体天线实现秘密通信

DOI:
10.1109/lcomm.2023.3264634
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发表时间:
2023
期刊:
IEEE Communications Letters
影响因子:
--
通讯作者:
Tang B
Tang B
中科院分区:
--
文献类型:
--
作者:
Tang B

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近年来的研究表明,流体天线是一种新型的位置可切换天线技术,它可以利用多径干扰信号自然产生的深衰落的空间矩来实现多址接入。在这封信中,这种现象被利用在物理层安全设置中,其中基站(BS)向合法用户发送信息承载信号,并向潜在的窃听者发送人工噪声(AN)信号,而用户配备有流体天线以克服AN信号。所提出的方法不需要基站(BS)的努力来避免AN信号伤害合法用户。为了提高保密率,我们研究了在基站处提供信道状态信息(CSI)的情况下承载信息和AN信号的功率分配。完美和不完美的CSI场景进行了研究。仿真结果表明,该系统,与一个单一的流体天线与一个射频(RF)链在用户,实现的保密率是相当的用户利用最大比合并(MRC)与许多天线,而不是,是唯一的方法鲁棒CSI的窃听者的不确定性,不需要在BS的功率分配,也没有波束成形。
Recent researches have revealed that fluid antenna, a new position-switchable antenna technology, can make use of the spatial moments of deep fades of the interference signal occurred naturally due to multipath for multiple access. In this letter, this phenomenon is exploited in a physical layer security setup where a base station (BS) transmits an information-bearing signal to a legitimate user and an artificial noise (AN) signal to a potential eavesdropper while the user is equipped with a fluid antenna to overcome the AN signal. The proposed approach needs no effort from the base station (BS) to avoid the AN signal from harming the legitimate user. To enhance the secrecy rate, we study the power allocation of the information-bearing and AN signals if the channel state information (CSI) is available at the BS. Both perfect and imperfect CSI scenarios are investigated. Simulation results demonstrate that the proposed system, with a single fluid antenna with one radio-frequency (RF) chain at the user, achieves the secrecy rate that is comparable to the user utilizing maximal ratio combining (MRC) with many antennas instead, and is the only approach robust to CSI uncertainties of the eavesdropper, requiring no power allocation nor beamforming at the BS.
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影响因子: 10.4
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