Low PAPR OFDM-Based DCSK Design With Carrier Interferometry Spreading Codes
Low PAPR OFDM-Based DCSK Design With Carrier Interferometry Spreading Codes
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DOI：
10.1109/lcomm.2018.2842196
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发表时间：
2018-05
期刊：
影响因子：
--
通讯作者：
Zhaofeng Liu;Lin Zhang;Zuwei Chen
中科院分区：
文献类型：
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作者：
Zhaofeng Liu;Lin Zhang;Zuwei Chen
多载波辅助非相干差分混沌键控（DCSK）调制系统中，由于多个调制信号的叠加，会产生较高的峰均功率比（PAPR）。在这封信中，我们提出了一个载波干涉（CI）码辅助扩频正交频分复用的DCSK方案来抑制PAPR。在该设计中，每个混沌码片通过CI码扩展到所有可用的子载波上，有效地降低了信号间的相干性，从而降低了PAPR。分析了该系统的理论峰均比和误比特率性能。在加性白色高斯噪声、频率选择性衰落和平坦衰落信道下进行了仿真。仿真结果验证了理论推导的有效性，并表明在保持BER性能的前提下，利用扩频CI码的PAPR性能优于相应的方案。
The multi-carrier aided non-coherent differential chaos shift keying (DCSK) modulated systems suffer from high peak-to-average power ratio (PAPR) due to the summations of multiple modulated signals. In this letter, we present a carrier interferometry (CI) code-aided spreading orthogonal frequency-division multiplexing-based DCSK scheme to suppress the PAPR. Instead of directly transmitting DCSK modulated signals via multiple subcarriers, in our design, each chaotic chip is spread over all available subcarriers by using CI codes, which effectively reduces the coherence among the signals, and thereby reducing PAPR. Furthermore, the theoretical PAPR and bit error rate (BER) performances are analyzed. Simulations are performed over additive white Gaussian noise, frequency selective fading, and flat fading channels. The results verify the effectiveness of our theoretical derivations, and demonstrate that the PAPR performance outperforms the counterpart schemes by exploiting the spreading CI codes, while retaining the satisfactory BER performance.