针对信道环境恶劣情况下的数字信号接收,提出了一种基于随机共振理论降低二进制相移键控信号相干接收误码率的新方法。通过与常规解调方法的对比仿真,发现基于随机共振非线性双稳系统解调的2PSK信号的误码率在低信噪比情况下有明显降低...针对信道环境恶劣情况下的数字信号接收,提出了一种基于随机共振理论降低二进制相移键控信号相干接收误码率的新方法。通过与常规解调方法的对比仿真,发现基于随机共振非线性双稳系统解调的2PSK信号的误码率在低信噪比情况下有明显降低。特别是信噪比在-14.4 d B到-5.2 d B范围内时,误码率曲线下降很快,在-7.4 d B时较传统线性解调系统误码率可降低20.1%。展开更多
The us of stochastic resonance （SR） can effectively achieve the detection of weak signal in white noise and colored noise. However, SR in chaotic interference is seldom involved. In view of the requirements for the ...The us of stochastic resonance （SR） can effectively achieve the detection of weak signal in white noise and colored noise. However, SR in chaotic interference is seldom involved. In view of the requirements for the detection of weak signal in the actual project and the relationship between the signal, chaotic interference, and nonlinear system in the bistable system, a self-adaptive SR system based on genetic algorithm is designed in this paper. It regards the output signal-to-noise ratio （SNR） as a fitness function and the system parameters are jointly encoded to gain optimal bistable system parameters, then the input signal is processed in the SR system with the optimal system parameters. Experimental results show that the system can keep the best state of SR under the condition of low input SNR, which ensures the effective detection and process of weak signal in low input SNR.展开更多
在谐振腔设计过程中,谐振腔的品质因数以及谐振频率都是需要考虑的关键因素.传统的方法是通过减小谐振腔的尺寸或者利用高次模来提高谐振腔的谐振频率,但是由于两种方法都有其局限性,导致设计结果并不理想.通过理论计算与模拟仿真相结...在谐振腔设计过程中,谐振腔的品质因数以及谐振频率都是需要考虑的关键因素.传统的方法是通过减小谐振腔的尺寸或者利用高次模来提高谐振腔的谐振频率,但是由于两种方法都有其局限性,导致设计结果并不理想.通过理论计算与模拟仿真相结合的方法,对影响谐振腔谐振频率的因素进行分析,得出了填充介质的材料属性与谐振腔谐振频率的关系.理论计算显示:当用"左手介质"作为谐振腔的填充物质时,可以在不改变谐振腔尺寸的基础上提高谐振频率.高频结构仿真器(high frequency structure simulator)的仿真数据也证明了以上结果,从而得出谐振腔的谐振频率可以不受谐振腔尺寸的限制.相较于传统理论而言,研究结论有进一步的发展,为探索和设计新颖的谐振腔提供了理论依据.展开更多
文摘针对信道环境恶劣情况下的数字信号接收,提出了一种基于随机共振理论降低二进制相移键控信号相干接收误码率的新方法。通过与常规解调方法的对比仿真,发现基于随机共振非线性双稳系统解调的2PSK信号的误码率在低信噪比情况下有明显降低。特别是信噪比在-14.4 d B到-5.2 d B范围内时,误码率曲线下降很快,在-7.4 d B时较传统线性解调系统误码率可降低20.1%。
基金Project supported by the National Natural Science Foundation of China(Grant No.61271011)
文摘The us of stochastic resonance （SR） can effectively achieve the detection of weak signal in white noise and colored noise. However, SR in chaotic interference is seldom involved. In view of the requirements for the detection of weak signal in the actual project and the relationship between the signal, chaotic interference, and nonlinear system in the bistable system, a self-adaptive SR system based on genetic algorithm is designed in this paper. It regards the output signal-to-noise ratio （SNR） as a fitness function and the system parameters are jointly encoded to gain optimal bistable system parameters, then the input signal is processed in the SR system with the optimal system parameters. Experimental results show that the system can keep the best state of SR under the condition of low input SNR, which ensures the effective detection and process of weak signal in low input SNR.
文摘在谐振腔设计过程中,谐振腔的品质因数以及谐振频率都是需要考虑的关键因素.传统的方法是通过减小谐振腔的尺寸或者利用高次模来提高谐振腔的谐振频率,但是由于两种方法都有其局限性,导致设计结果并不理想.通过理论计算与模拟仿真相结合的方法,对影响谐振腔谐振频率的因素进行分析,得出了填充介质的材料属性与谐振腔谐振频率的关系.理论计算显示:当用"左手介质"作为谐振腔的填充物质时,可以在不改变谐振腔尺寸的基础上提高谐振频率.高频结构仿真器(high frequency structure simulator)的仿真数据也证明了以上结果,从而得出谐振腔的谐振频率可以不受谐振腔尺寸的限制.相较于传统理论而言,研究结论有进一步的发展,为探索和设计新颖的谐振腔提供了理论依据.
