基于随机共振理论对2FSK信号输出误码率的研究

摘要

2FSK signals are often used for low speed data transmissions.But,in the case of strong noise,2FSK signals may receive higher error rate.A novel method for decreasing the coherent reception error rate of binary phase shift keying signals based on the stochastic resonance theory was introduced to get the enhanced reception of 2FSK signals under noisy environment.The model was built in accordance with the stochastic resonance theory and put into use by utilizing MATLAB.Compared with the traditional demodulation,method,a great reduction in the signal to noise ratio(SNR) was obtained from-14.3-0 dB.The error rate is decreased by 14.3％.Meanwhile,the spectrum amplitude of the outputting carrier wave is 2.07 times that by using the previous method.%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-14.3～0 dB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-6.5 dB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.