Carrier Interferometry Code Index Modulation Aided OFDM-Based DCSK Communications
Carrier Interferometry Code Index Modulation Aided OFDM-Based DCSK Communications
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DOI：
10.1109/vtcfall.2019.8891582
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发表时间：
2019-09
期刊：
影响因子：
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通讯作者：
Zhaofeng Liu;Lin Zhang;Zhiqiang Wu;Jing Bian
中科院分区：
文献类型：
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作者：
Zhaofeng Liu;Lin Zhang;Zhiqiang Wu;Jing Bian
提出了一种新的载波干涉码索引调制辅助正交频分复用差分混沌键控通信系统。在我们的设计中，我们利用CI码矩阵的正交性，并建议使用CI码矩阵的索引来传输更多的信息比特。输入信息流被分成两个子集。一个子集由混沌序列调制，然后由携带另一个信息子集的CI码矩阵进行扩频。在接收端，分别对这两个子集进行非相干混沌解调和最大似然检测，以恢复信息。由于可以传输更多的比特，而不需要额外的混沌序列，并保持相同的总能量，提高了能量效率。此外，由于通过使用CI码实现了频域中的扩展，可以抑制峰均功率比（PAPR）。此外，理论性能，包括能量效率，误码率（BER）的表达式进行了分析。仿真结果验证了理论分析的正确性，并表明该设计具有令人满意的PAPR和BER性能。
In this paper, we proposed a novel carrier interferometry (CI) code index modulation aided orthogonal frequency division multiplex (OFDM) differential chaotic shift keying (DCSK) communication system. In our design, we utilize the orthogonality property of CI codes matrix, and propose to transmit more information bits using the index of the CI codes matrix. The input information stream is divided into two subsets. One subset is modulated by the chaotic sequence and then spread by the information-bearing CI codes matrix which carries another information subset. At the receiver, the non-coherent chaotic demodulation and the maximum likelihood detection are respectively performed on these two subsets to retrieve the information. Since more bits can be transmitted while not requiring extra chaotic sequences and remaining the same overall energy, the energy efficiency is improved. Additionally, thanks to the spreading in the frequency domain achieved by the usage of CI codes, the peak to average power ratio (PAPR) can be suppressed. Moreover, theoretical performances including the energy efficiency, the bit error rate (BER) expressions are analyzed. Simulation results are provided to validate the theoretical analysis, and demonstrate the satisfactory PAPR and BER performances achieved by our design.