噪声改善码元传输

Noise Improving Code Elements Transmission

文中运用随机共振来改善码元的传输。对于由字符构成的文本,通过编码生成一系列的码元作为系统输入信号,经过带有噪声的系统传输后,进行译码得到接收文本。文中使用的噪声为高斯型的加性与乘性噪声,逐渐增加噪声强度,接收文本中出错字符比例先降低再增高,从而存在最佳噪声强度,此时出错比例最小,系统性能最好。另外,乘性噪声在改善信号传输时,表现出了一定的鲁棒性。最后,讨论了阈值单元数目与系统阈值的变化对系统性能的影响。

In this paper,stochastic resonance is applied to improve code elements transmission. A series of code elements are generated by encoding characters in a text,and they act as the input signals of system. And then,get the translated text by decoding these received code words. The system is subject to additive and multiplicative noises which are both Gaussian. Increasing noise intensity gradually,the ratio of error characters in the translated text will decrease first,and increase later. There exists an optimal noise intensity,which reduces the ra-tio of error to the least level,and the performance of the system is at the best. In addition,in the process of improving signals transmis-sion,multiplicative noise shows its robustness. At last,discuss the influence on varying of threshold units number and system threshold for the system performance.