Transmitter authentication using hierarchical modulation in dynamic spectrum sharing
Transmitter authentication using hierarchical modulation in dynamic spectrum sharing
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DOI：
10.1016/j.jnca.2017.05.007
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发表时间：
2017-08
期刊：
影响因子：
--
通讯作者：
Vireshwar Kumar;J. Park;Kaigui Bian
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文献类型：
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作者：
Vireshwar Kumar;J. Park;Kaigui Bian
动态频谱共享(DSS)的关键挑战之一是识别违反频谱管理机构规定的频谱接入规则的不一致发射机。一种便于识别DSS中的发射机的方法是要求每个发射机在其物理层的波形中嵌入唯一可识别的认证信号。在现有的大多数物理层认证方案中，认证信号被作为噪声添加到消息信号中，这导致在假设平均发射功率恒定的情况下，消息信号的信噪比(SNR)和认证信号的SNR之间存在权衡。这意味着，不牺牲后者就不能改善前者，反之亦然。在本文中，我们提出了一种新的物理层认证方案--改进的双二进制信令分层调制认证方案(HMM-DSA)，它放宽了上述折衷的限制。HMM-DSA利用改进的双二进制滤波器将一定量的符号间干扰引入到消息信号中，并以滤波器系数的形式嵌入认证信号。我们的结果表明，与现有技术相比，所提出的HMM-DSA方案改善了消息信号的差错性能。
One of the critical challenges in dynamic spectrum sharing (DSS) is identifying non-conforming transmitters that violate spectrum access rules prescribed by a spectrum regulatory authority. One approach for facilitating identification of the transmitters in DSS is to require every transmitter to embed an uniquely-identifiable authentication signal in its waveform at the PHY-layer. In most of the existing PHY-layer authentication schemes, the authentication signal is added to the message signal as noise, which leads to a tradeoff between the message signal's signal-to-noise ratio (SNR) and the authentication signal's SNR under the assumption of constant average transmitted power. This implies that one cannot improve the former without sacrificing the latter, and vice versa. In this paper, we propose a novel PHY-layer authentication scheme calledHierarchical Modulation with Modified Duobinary Signaling for Authentication(HMM-DSA), which relaxes the constraint on the aforementioned tradeoff. HMM-DSA utilizes a modified duobinary filter to introduce some controlled amount of inter-symbol interference into the message signal, and embeds the authentication signal in the form of filter coefficients. Our results show that the proposed scheme, HMM-DSA, improves the error performance of the message signal as compared to the prior art.