基于光栅型码分多址的码字转换研究

Study of Code Word Conversion Based on Grating CDMA

研究了相移超结构光纤布拉格光栅(SSFBG)的码字转换原理,用传输矩阵法分析了7码片的相移SSFBG编解码器的反射谱及其相关特性,并用高斯脉冲进行了码字转换的仿真验证。结果表明:只要系统采用的码字有良好的自相关性和互相关性,高斯脉冲进入编解码器进行码字转换后,都能较好地从对应码字的解码器恢复出来。

Based on Superstructure Fiber Bragg Grating（SSFBG）, encoding/ decoding principles were researched and its reflection spectrum and correlation property were analyzed by transmis- sion matrix method. Simulation of codeword conversion was verified by using Gaussian pulse. Results show that the good autocorrelation and cross correlation of the codeword were used in the system. After entering the codeword translation and being coded, Gaussian pulse was well restored.