Reliable and Secure Pre-Coding OFDM-DCSK Design for Practical Cognitive Radio Systems With the Carrier Frequency Offset
Reliable and Secure Pre-Coding OFDM-DCSK Design for Practical Cognitive Radio Systems With the Carrier Frequency Offset
复制标题
具有载频偏移的实用认知无线电系统的可靠且安全的预编码 OFDM-DCSK 设计
DOI：
10.1109/tccn.2019.2959332
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发表时间：
2020-03
期刊：
影响因子：
--
通讯作者：
吴志强
中科院分区：
文献类型：
--
作者：
刘兆丰;张琳;吴志强
针对认知无线电(CR)系统，提出了一种基于非连续(NC)频段的预编码(PC)正交频分复用辅助差分混沌键控(OFDMDCSK)方案。在实际认知无线电系统中，收发信机或非理想部件的基频偏差会引起载波频偏，从而降低频谱感知精度，降低系统的可靠性。此外，由于无线信道的广播特性，CR系统可能遭受窃听或恶意攻击。为了同时对抗CFO和提高系统的保密性能，在我们的设计中，利用参考混沌序列对信息比特进行调制，然后将携带数据的混沌符号和参考符号传送到预编码模块，在预编码模块中交织混沌码片，添加混沌掩码和复制码片。在进行了ofdm调制之后，混沌信号通过信道传输。在接收器处，执行反向操作。此外，我们还推导了理论误码率和信息泄漏的表达式。仿真结果验证了所提方法的有效性，并证明了与同类系统相比，所提出的系统具有更高的可靠性和安全性。
In this paper, we present a pre-coding (PC) orthogonal frequency division multiplexing-aided differential chaos shift keying (OFDM-DCSK) scheme over non-contiguous (NC) spectrum bands for cognitive radio (CR) systems. In practical CR systems, the offset of fundamental clocks of transceivers or non-ideal components induce the carrier frequency offset (CFO), which will reduce the spectrum sensing accuracy and degrade reliability performances. Additionally, CR systems probably suffer from eavesdropping or malicious attacks due to the broadcasting property of wireless channels. With the aim to simultaneously combat the CFO and to enhance the security performance, in our OFDM-DCSK design, the information bits are modulated by reference chaotic sequences, then the data-bearing chaotic symbols and reference symbols are delivered to the pre-coding module, wherein we interleave chaotic chips, add the chaotic mask and duplicate chips. After OFDM modulations, the chaotic signals are transmitted over channels. At the receiver, reverse operations are performed. Moreover, we derive the theoretical bit error rate (BER) and information leakage expressions. Simulations are provided to verify the effectiveness of our derivations, and to demonstrate that more reliable and secure performances can be achieved by the presented system compared with counterpart systems.
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DOI：
10.1109/iccnc.2017.7876284
发表时间：
2017
期刊：
2017 International Conference on Computing, Networking and Communications (ICNC)
影响因子：
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作者：
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DOI：
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期刊：
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影响因子：
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DOI：
10.1109/compcomm.2017.8322642
发表时间：
2017-12
期刊：
2017 3rd IEEE International Conference on Computer and Communications (ICCC)
影响因子：
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作者：
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DOI：
10.1109/iccic.2016.7919725
发表时间：
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期刊：
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S. Sasipriya;R. Vigneshram