2FSK信号常用于进行中低速数据传输,但在强噪声背景下2FSK信号接收产生的误码率较高,基于以上问题提出了一种基于随机共振理论降低2FSK信号相干接收误码率的新方法。根据随机共振原理建立了非线性系统模型,进行数值实验研究,并与传统降低误码率的解调方法进行对比。实验数据显示:系统输入信噪比在-14.3dB~0dB区间时,输出的误码率会呈现大幅度的降低,其中系统输入信噪比在-6.5dB时,相比于传统模型误码率下降了14.3%,同时输出的频谱载波幅值是传统方法的2.07倍,系统输出信号的准确率得到大幅提升。
Abstract
2FSK signal is often used for low speed data transmission,but under the background of strong noise 2FSK signal receiving the error rate is higher. A novel method, based on the decreasing coherent reception error rate of binary phase shift keying signal with stochastic-resonance-theory, was introduced to get enhanced reception of 2FSK signal under noisy environment. The model was built under stochastic-resonance-theory and calculated utilizing MATLAB. Compared with the traditional demodulation, a great reduction of signal to noise ratio(SNR) was obtained from -14.3dB to 0dB. Furthermore, the error rate decreased by 14.3%. Meanwhile, the outputting carrier wave was 2.07 times the spectrum amplitude of that under previous method.
关键词
随机共振 /
误码率 /
2FSK信号 /
非线性双稳系统 /
信噪比
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Key words
Stochastic Resonance /
Bit Error Rate /
2FSK Signal /
Nonlinea Bistable system /
Signal to noise ratio
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脚注
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