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On signal space diversity: An adaptive interleaver for enhancing physical layer security in frequency selective fading channels

机译：关于信号空间分集：一种自适应交织器，用于增强频率选择性衰落信道中的物理层安全性

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摘要

Signal space diversity is a powerful technique that increases reliability of detection over fading channels. In this paper, we explore the ability of this technique to provide secure communication. We enhance the security of OFDM systems in frequency selective fading channels by providing more diversity gain to the legitimate user compared to an eavesdropper. This is done by adapting the interleaving pattern to the channel of the legitimate user in rich multipath environments, where spatially separated channels are typically independent to each other. This ensures secrecy in a time division duplex system, where the eavesdropper has no information regarding the channel of the legitimate user. The scheme can also be used in the conventional frequency division duplex system, which is more challenging in terms of security aspects because of the channel state information leakage. A theoretical analysis is presented on the bit-error probability in Rayleigh fading environment. The numerical results support the conclusion that adapting the interleaving pattern to the CSI of the legitimate user provides a gain in the bit-error rate performance over the eavesdropper.
机译：信号空间分集是一项强大的技术，可提高衰落信道上检测的可靠性。在本文中，我们探索了该技术提供安全通信的能力。通过向合法用户提供比窃听者更多的分集增益，我们提高了频率选择性衰落信道中OFDM系统的安全性。这是通过在丰富的多路径环境中使交织模式适应合法用户的信道来完成的，在该环境中，空间上分离的信道通常彼此独立。这确保了时分双工系统中的保密性，在该系统中，窃听者没有有关合法用户频道的信息。该方案也可以用在常规的频分双工系统中，由于信道状态信息泄漏，在安全性方面更具挑战性。对瑞利衰落环境下的误码率进行了理论分析。数值结果支持这样的结论，即使交织模式适应合法用户的CSI，可以使窃听者的误码率性能得到提高。

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