Title :
Trellis-coded asynchronous optical CDMA systems
Author :
Liu, Maw-Yang ; Tsao, Hen-Wai
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
fDate :
2/1/2001 12:00:00 AM
Abstract :
Since optical code division multiple access (CDMA) is an interference-limited system, we propose a system employing trellis-coded scheme and double optical hardlimiters (TC-DHLs) to alleviate the adverse impact of multiple access interference. For asynchronous transmission, optical orthogonal code (OOC) is utilized as signature sequence. System performance is evaluated under the chip synchronous case among different users, and thermal noise, avalanche photodiode (APD) noise, and interference are taken into consideration. Numerical results show that our proposed scheme can further reduce the error floor up to several orders over systems that using only double optical hardlimiters
Keywords :
code division multiple access; digital communication; error statistics; interference (signal); optical fibre LAN; thermal noise; trellis coded modulation; APD noise; BER; MAI; asynchronous optical CDMA systems; asynchronous transmission; avalanche photodiode noise; bit error rate; chip synchronous case; double optical hardlimiters; error floor reduction; high speed LANs; interference-limited system; multiple access interference; optical code division multiple access; optical orthogonal code; signature sequence; system performance evaluation; thermal noise; trellis-coded scheme; Aggregates; Avalanche photodiodes; High speed optical techniques; Multiaccess communication; Multiple access interference; Optical fiber LAN; Optical noise; Optical transmitters; System performance; Upper bound;
Journal_Title :
Lightwave Technology, Journal of
