Title :
Performance evaluation of a coded CDMA optical system
Author :
Oellermann, Timothy ; Takawira, Fambirai
Author_Institution :
Dept. of Electron. Eng., Natal Univ., Dalbridge, South Africa
Abstract :
The performance of a coherent code division multiple access (CDMA) optical fiber communication system is degraded by the phase noise of the semiconductor lasers and by multiple access interference (MAI). This paper examines the effects of phase noise on the performance of a CDMA optical system. Results show that the combined effects of MAI and laser phase noise impose a very low limit on the number of simultaneous users. We investigate the possibility of increasing the receiver sensitivity using convolutional coding with Viterbi decoding, and show that coding significantly improves system performance, and allows for relaxation of the laser linewidth
Keywords :
Viterbi decoding; code division multiple access; convolutional codes; electromagnetic interference; filtering theory; laser noise; matched filters; optical fibre communication; optical modulation; optical receivers; phase modulation; phase noise; semiconductor lasers; BPSK; MAI; Viterbi decoding; binary phase shift keying; coded CDMA optical system; coherent code division multiple access; convolutional coding; error probability; laser linewidth; laser phase noise; matched filter receiver; multiple access interference; optical fiber communication system; performance evaluation; receiver sensitivity; semiconductor lasers; system performance; Fiber lasers; Laser noise; Multiaccess communication; Multiple access interference; Optical fiber communication; Optical noise; Optical receivers; Optical sensors; Phase noise; Semiconductor lasers;
Conference_Titel :
Military Communications Conference, 1996. MILCOM '96, Conference Proceedings, IEEE
Conference_Location :
McLean, VA
Print_ISBN :
0-7803-3682-8
DOI :
10.1109/MILCOM.1996.571414
