Energy Efficient Artificial Fast Fading for MISO-OFDM Systems
Energy Efficient Artificial Fast Fading for MISO-OFDM Systems
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DOI：
10.1109/glocom.2014.7417411
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发表时间：
2014-12
期刊：
影响因子：
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通讯作者：
Tomoki Akitaya;T. Saba
中科院分区：
文献类型：
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作者：
Tomoki Akitaya;T. Saba
对于安全的无线通信，降低窃听者接收信号质量的物理层安全技术是有用的。在物理层安全技术中，人工快速衰落（AFF）技术通过对发射信号产生伪快速衰落而降低窃听者接收信号的质量。这是通过在每个符号间隔内用随机权重乘以要传输的信号来实现的。然而，AFF技术往往会增加加权信号的功率。在这种情况下，必须在传输前对加权信号进行归一化处理。这会导致合法接收器的能量损失。因此，我们考虑最小化权向量的范数，以防止加权信号的功率增加。在本文中，我们提出了三种节能的AFF发电方案。在第一种方案中，调整随机权值的相位以最小化在合法接收机处抵消AFF所需的非随机权值的范数。在第二种方案中，使用两个或多个非随机权重来最小化权向量的范数。第三种方案是这两种方案的结合。仿真结果表明，与传统的AFF生成方案相比，所提方案具有更高的遍历互信息。
For secure wireless communications, physical layer security techniques, which degrade the received signal quality of the eavesdropper, are useful. Among the physical layer security techniques, an artificial fast fading (AFF) technique degrades the received signal quality of eavesdroppers by causing pseudo fast fading to the transmitting signals. This is realized by multiplying the signals to be transmitted by random weights every symbol interval. However, the AFF technique often increases the power of the weighted signals. In such cases, the weighted signals must be normalized before transmission. This causes energy loss in the legitimate receiver. Therefore, we consider minimizing the norm of the weight vector to prevent the power of the weighted signals from being increased. In this paper, we propose three energy efficient AFF generation schemes. In the first scheme, the phases of random weights are adjusted to minimize the norm of the non-random weight which is required to cancel AFF out at the legitimate receiver. In the second scheme, two or more non-random weights are used for minimizing the norm of the weight vector. The third proposed scheme is the combination of these two schemes. Simulation results show that the proposed schemes achieve higher ergodic mutual information as compared with the conventional AFF generation scheme.