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为验证混沌通信技术在常规通信信号检测中的实际效果,本文提出了一种用混沌方法检测常规通信信号的新概念数字接收机的实现模型,设计了基于同频杜芬振子阵列模型的常规DPSK信号混沌数字接收机,来验证混沌杜芬振子对DPSK通信信号解调的检测性能。设计中采用杜芬(Duffing)振子阵列模型检测非相干通信信号,利用杜芬振子阵列相轨迹图案的独有特征,通过区域分割器直接提取出通信信号基带信息,再经过匹配滤波器和抽样判决器恢复出基带信号,实现对常规DPSK通信信号的检测解调。采用Altera公司提供的FPGA开发板作为该接收机硬件系统的算法实现平台,测试结果表明该混沌数字接收机系统实现了常规DPSK信号的解调功能。最后通过与传统DPSK实际系统、DCSK和I-DCSK混沌系统仿真结果比较,具有较好的误码率性能。
In order to verify the actual effect of chaotic communication technology in routine communication signal detection, this paper presents a realization model of a new concept digital receiver using chaos method to detect the conventional communication signals, and designs a conventional DPSK based on the same frequency Duffy oscillator array model Signal chaos digital receiver to verify the detection performance of the DPSK communication signal demodulation by the chaotic Duffing oscillator. In the design, the Duffing oscillator array model is used to detect the incoherent communication signals. By using the unique characteristics of the phase trace pattern of the Duffing oscillator array, the baseband signal of the communication signal is extracted directly by the region splitter. After matched filter and sampling decision The device recovers the baseband signal to realize the detection and demodulation of the conventional DPSK communication signal. The FPGA development board provided by Altera Corporation is used as the algorithm implementation platform of the hardware system of the receiver. The test results show that the chaotic digital receiver system realizes the demodulation function of the conventional DPSK signal. Finally, compared with the traditional DPSK real system, DCSK and I-DCSK chaotic system simulation results, it has better BER performance.