Equalization attacks against OFDM: analysis and countermeasures

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• 作者：Chowdhury Shahriar ; T. Charles Clancy and Robert W. McGwier
• 刊名：Wireless Communications and Mobile Computing
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：16
• 期：13
• 页码：1809-1825
• 全文大小：1379K
• ISSN：1530-8677

文摘

This paper introduces, investigates, and proposes power-efficient equalization jamming attacks against the orthogonal frequency division multiplexing (OFDM) and possible countermeasures. Signals known a priori, called pilot tones, are employed in the conventional OFDM-based systems to estimate the channel response and perform equalization. Attacks against these pilot tones can hamper equalization and degrade target's performance. This paper begins with noise-based pilot tone jamming and moves onto pilot nulling attack. The paper embraces two mitigation strategies of randomizing the pilot tones. The paper presents mathematical model of effective noise per symbol and simulation results for OFDM systems with conventional and randomized pilot-tones under such attacks. The paper concludes that the noise-based pilot tone attacks are power efficient than conventional attacks, and the pilot nulling is capable of doing the most damage, but in the expense of additional channel state information. The paper also claims that the mitigation strategies offer a remedy, but works relatively poorly when no jammer is present. Copyright