W-OCDMA系統(tǒng)中MPC/OOC二維碼的構(gòu)造及實(shí)現(xiàn)

基于光正交跳頻碼構(gòu)造原理，分別用改進(jìn)素數(shù)碼和光正交碼為時(shí)域擴(kuò)頻模式和頻域跳頻模式，并構(gòu)造了適用于無線光碼分多址系統(tǒng)的調(diào)整數(shù)碼/光正交碼二維組合碼。和現(xiàn)有二維碼相比，該組合碼容量大，通過有規(guī)律的分組，每組內(nèi)碼字具有良好的相關(guān)性，同時(shí)組內(nèi)具有較大的碼容量。該構(gòu)造方式易于實(shí)現(xiàn)，對(duì)構(gòu)造實(shí)例設(shè)計(jì)了可調(diào)諧光纖布拉格光柵編解碼器。Based on the construction theory of optical orthogonal hopping codes, constructed the two dimensions MPC/OOC combination codes for the wireless-OCDMA system with the modified prime code as time spreading codes and the optical orthogonal codes as frequency hopping codes. This coding scheme has large code’s capacity compared with the two dimensional codes in existence. By grouping, the MPC/OOC code has good performance in auto-correlation and cross-correlation with still quite large codes capacity. Designed the tunable FBG encoder and decoder to the construction example.