Rand-OFDM: A Secured Wireless Signal
Rand-OFDM: A Secured Wireless Signal
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DOI：
10.1109/comsnets48256.2020.9027359
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发表时间：
2019-12
期刊：
影响因子：
--
通讯作者：
Hesham Mohammed;D. Saha
中科院分区：
文献类型：
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作者：
Hesham Mohammed;D. Saha
无线通信从一开始就是一种广播系统，它违反了预期发送和接收对之间的物理层的安全和隐私问题。随着我们走向先进的频谱共享方法，涉及通过无线网络连接的数十亿设备，至关重要的是保护无线信号，以便只有预期的接收器才能实现信号的特性。在本文中，我们提出了一种使用共享密钥保护的新波形--Rand-ofdm，其中信号特性只能在期望的接收器处恢复。我们通过在时间域上对信号进行修改，从而消除信号的特性，进而将信号的特性混淆给窃听者，从而实现信号级的安全。我们引入了一种基于密钥的安全训练信号用于信道估计，它只能在预先知道密钥的预定接收器上使用。作为信号恢复的最后一步，我们使用基于聚类的技术来校正接收信号的相位。我们的密码分析表明，Rand-ofdm在未来的宽带信号中特别有用。大量的仿真和空中实验表明，由于安全波形在≈1-4DB之间变化，RAND-OFDM码的性能与传统的OFDM码相当，信噪比损失也很小。在所有这些场景中，即使在尽可能高的信噪比下，Rand-ofdm仍然不能被对手识别。
Wireless communication has been a broadcast system since its inception, which violates security and privacy issues at the physical layer between the intended transmit and receive pairs. As we move towards advanced spectrum sharing methodologies involving billions of devices connected over wireless networks, it is essential to secure the wireless signal such that only the intended receiver can realize the properties of the signal. In this paper, we propose Rand-OFDM, a new waveform, secured with a shared secret key, where the signal properties can be recovered only at the expected receiver. We achieve the signal level security by modifying the OFDM signal in time-domain, thus erasing the OFDM properties and in turn obfuscating the signal properties to an eavesdropper. We introduce a key-based secured training signal for channel estimation, which can be used only at the intended receiver with prior knowledge of the key. As a final step for recovery of the signal, we use a clustering based technique to correct the phase of the received signal. Our cryptanalysis shows that Rand-OFDM is especially useful in future wide band signals. Extensive simulation and over-the-air experiments show that the performance of Rand-OFDM is comparable to legacy OFDM and SNR penalty due to the secured waveform varies between ≈ 1-4dB. In all these scenarios, Rand-OFDM remains unrecognized by the adversary even at the highest possible SNR.