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混沌载波通信是混沌通信领域最具代表性的一个研究方向。它用混沌信号作为通信的载波,与用正弦波作载波的传统数字通信直接对应。由于混沌信号与正弦信号等传统的确定性周期信号具有完全不同的特性,它具有较宽的连续频谱,且表现类δ函数的相关特性,因此用混沌信号作通信的载波,也使得整个通信系统具有崭新的特点。本文通过仿真实验对两种典型的混沌载波通信系统DCSK和FM-DC-SK,分别与传统数字通信系统在加性高斯白噪声信道和频率非选择性慢衰落信道下进行性能比较。比较的结果表明混沌载波通信系统在高斯信道下的噪声性能远远差于传统数字通信系统,而在频率非选择性慢衰落信道中则表现出极大的优势。最后,通过仿真实验验证了最优接收机对DCSK性能的改善,表明混沌载波通信的性能仍然具有提高的潜质。
Chaos carrier communication is one of the most representative research directions in the field of chaos communication. It uses the chaos signal as the communication carrier, which corresponds directly to the traditional digital communication with a sine wave carrier. Due to the completely different characteristics of traditional deterministic periodic signals, such as chaotic signals and sinusoidal signals, which have wide continuous frequency spectrum and exhibit the relevant characteristics of the delta-like functions, the carrier used for communication by chaos signals also makes the whole communication system Has a new feature. In this paper, two typical chaotic carrier communication systems, DCSK and FM-DC-SK, are compared with those of traditional digital communication systems under additive white Gaussian noise channel and frequency non-selective slow fading channel, respectively. The comparison results show that the noise performance of the chaotic carrier communication system under the Gaussian channel is far worse than that of the traditional digital communication system, while it shows great advantages in the frequency non-selective slow fading channel. Finally, the simulation results show that the optimal receiver can improve the performance of DCSK, which shows that the performance of chaotic carrier communication still has potential to be improved.