Title :
Channel interference reduction using random Manchester codes for both synchronous and asynchronous fiber-optic CDMA systems
Author :
Lin, Che-Li ; Wu, Jingshown
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
We propose the random Manchester codes (RMC) to improve the bit error probability (BEP) performance in both synchronous and asynchronous fiber-optic code-division multiple-access (CDMA) systems. The spreading sequences used in the synchronous and asynchronous systems are modified prime sequence codes and optical orthogonal codes (OOCs), respectively. Thermal noise, shot noise, and avalanche photodiode (APD) bulk and surface leakage currents are taken into consideration in the BEP analyzes. The results show that the proposed systems can support a larger number of simultaneous users than other systems with similar system complexity under the same bit-error probability constraint.
Keywords :
avalanche photodiodes; code division multiple access; codes; error statistics; leakage currents; optical fibre communication; shot noise; synchronisation; telecommunication channels; thermal noise; asynchronous fiber-optic; avalanche photodiode; bit error probability performance; bit-error probability constraint; channel interference reduction; modified prime sequence codes; optical orthogonal codes; random Manchester codes; shot noise; surface leakage currents; synchronous fiber-optic CDMA systems; thermal noise; Avalanche photodiodes; Error probability; High speed optical techniques; Interference; Multiaccess communication; Optical fiber communication; Optical fiber devices; Optical fibers; Optical noise; Optical sensors;
Journal_Title :
Lightwave Technology, Journal of
