Title :
Performance analysis of atmospheric optical CDMA systems
Author :
Ohtsuki, Tomoaki
Author_Institution :
Dept. of Electr. Eng., Tokyo Univ. of Sci., Chiba, Japan
Abstract :
We propose atmospheric (free-space) optical code-division multiple-access (CDMA) systems. We analyze the bit error rate (BER) of the proposed system using pulse position modulation (PPM) taking into consideration the effects of scintillation, avalanche photodiode (APD) noise, thermal noise, and multiuser interference. We show that atmospheric optical CDMA systems can realize communications at a bit rate of 156 Mbps when the logarithm variance of the scintillation σs2 is smaller than, or equal to, 0.1. When σs2 is large, we need to use forward error correction codes (FECs).
Keywords :
code division multiple access; electromagnetic interference; error correction codes; error statistics; forward error correction; optical communication; optical links; optical noise; pulse position modulation; scintillation; semiconductor device noise; thermal noise; 156 Mbit/s; BER; FEC; PPM; atmospheric optical system; avalanche photodiode noise; bit error rate; code-division multiple-access; forward error correction codes; free-space optical links; multiuser interference; optical CDMA systems; pulse position modulation; scintillation; thermal noise; Avalanche photodiodes; Bit error rate; Error analysis; Forward error correction; Multiaccess communication; Optical modulation; Optical noise; Optical pulses; Performance analysis; Pulse modulation;
Conference_Titel :
Communications, 2002. ICC 2002. IEEE International Conference on
Print_ISBN :
0-7803-7400-2
DOI :
10.1109/ICC.2002.997377
