Achieving Secrecy of MISO Fading Wiretap Channels via Jamming and Precoding With Imperfect Channel State Information
Achieving Secrecy of MISO Fading Wiretap Channels via Jamming and Precoding With Imperfect Channel State Information
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DOI：
10.1109/lwc.2014.2317194
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发表时间：
2014-04
影响因子：
6.3
通讯作者：
Qi Xiong;Yi Gong;Ying-Chang Liang;K. H. Li
中科院分区：
文献类型：
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作者：
Qi Xiong;Yi Gong;Ying-Chang Liang;K. H. Li
在这封信中，我们认为在多输入单输出（MISO）衰落窃听信道的物理层安全，其中发射机利用干扰辅助预编码传输策略，以最大限度地提高信道的可实现的保密率。窃听者的信道的瞬时信道状态信息被认为在发射机处不可用。推导出各态历经保密率的封闭表达式，并在此基础上发现信息信号和干扰信号之间存在最佳功率分配比。渐近分析表明，最佳功率比取决于天线的数量，以及在爱丽丝可用的发射功率。
In this letter, we consider physical layer security in multiple-input single-output (MISO) fading wiretap channels, where the transmitter utilizes a jamming-aided precoding transmission strategy to maximize the achievable secrecy rate of the channel. The instantaneous channel state information of the eavesdropper's channel is considered unavailable at the transmitter. We derive the closed-form expression of the ergodic secrecy rate, based on which we find that there exists an optimal power allocation ratio between the information signal and the jamming signal. Asymptotic analysis shows that the optimal power ratio depends on the number of antennas as well as the available transmit power at Alice.