Title :
Performance Analyses on Hybrid MQC/M-Sequence Coding Over Frequency/Spatial Optical CDMA System
Author :
Yang, Chao-Chin ; Huang, Jen-Fa ; Chiu, I-Min
Author_Institution :
Dept. of Electron. Eng., Kun Shan Univ., Tainan
Abstract :
A new two-dimensional frequency/spatial code for spectral-amplitude coding a optical code-division multiple-access system is proposed. The corresponding coder/decoder pairs are based on the tunable fiber-Bragg gratings cooperating with optical splitters/combiners, and multiple-access interference can be eliminated through the proposed decoding mechanism. For the performance analysis, the effects of phase-induced intensity noise, shot noise, and thermal noise are considered simultaneously. Bit-error rate (BER) performance is compared with that of the former system using M-matrix codes. It is shown that the system using these new code matrices not only maintains most advantages of the former one, but also allows larger number of active users under a given BER
Keywords :
Bragg gratings; code division multiple access; decoding; error statistics; interference suppression; m-sequences; matrix algebra; optical fibre networks; optical fibres; shot noise; thermal noise; M-matrix codes; M-sequence coding; bit-error rate performance; coder-decoder pairs; decoding mechanism; frequency-spatial optical CDMA system; hybrid MQC coding; modified quadratic congruence codes; multiple-access interference elimination; optical code-division multiple-access system; optical splitters-combiners; phase-induced intensity noise; shot noise; spectral-amplitude coding; thermal noise; tunable fiber-Bragg gratings; two-dimensional frequency-spatial code; Bit error rate; Bragg gratings; Decoding; Fiber gratings; Frequency; Multiaccess communication; Multiple access interference; Optical noise; Performance analysis; Phase noise; Fiber-Bragg gratings (FBGs); multiple-access interference (MAI); optical code-division multiple-access (OCDMA); spectral-amplitude coding (SAC);
Journal_Title :
Communications, IEEE Transactions on
DOI :
10.1109/TCOMM.2006.887793