Teeb liab constellation shaping

Zhi Zhang et al. los ntawm Lub Tsev Kawm Ntawv ntawm Kev Sib Txuas Lus thiab Cov Ntaub Ntawv Engineering, University of Electronic Science thiab Technology ntawm Tuam Tshoj tau tsim ib lub hnub qub Reshaping chaotic encryption (CSCEn) lub tswv yim nrog cov ntaub ntawv txheeb cais tswj tau, raws li qhia hauv FIG. 2. Ua ntej, orthogonal amplitude modulation (QAM) cov cim ua ntu zus tau muab faib ua ob peb ntu, thiab qhov ua tau zoo (PS) tau ua raws li cov ntaub ntawv txheeb cais (SI) (los ntawm kev hloov pauv hauv cheeb tsam constellation). Tom qab ntawd, SI sequences tau encoded thiab encrypted rau hauv chaotic teeb liab theem siv qhov tseem ceeb faib algorithm. SI tau muab rho tawm ntawm qhov kawg tau txais kom rov qab tau qhov qub teeb liab [2]. Cov kws tshawb fawb tau ntse xa cov teeb liab encrypted ps-16-qam hla tus qauv ib hom fiber ntau (SSMF) ntawm 25km. Vim tias cov tswv yim no tuaj yeem tsis tsuas yog paub txog kev xa tawm yooj yim nrog qhov tsis yooj yim thiab txhim kho kev ua haujlwm ntawm kev xa thiab txais cov cim, tab sis kuj tseem muaj kev ruaj ntseg txaus los tiv thaiv qhov kev tawm tsam los ntawm kev ua txhaum cai kho qhov muag network (ONU), nws yuav undoubtedly muaj daim ntawv thov kev cia siab yav tom ntej.