Title :
Optical CDMA with overlapping PPM
Author :
Shalaby, Hossam M H
Author_Institution :
Dept. of Electr. Eng., Malaya Univ., Kuala Lumpur, Malaysia
Abstract :
Direct-detection optical code-division multiple access (CDMA) systems employing overlapping pulse-position modulation (OPPM) schemes are proposed. A union upper bound on the bit error rate is derived taking into account the effect of both multiple-user interference and receiver shot noise. The photodiodes´ dark currents are neglected in order to have some insights on the problem. Performance characteristics are then compared to the traditional on off keying (OOK) and pulse-position modulation (PPM) schemes. It is shown that under the constraints of both throughput and chip time, the OPPM system outperforms both traditional systems
Keywords :
code division multiple access; error statistics; light interference; optical fibre networks; optical modulation; optical receivers; optical signal detection; pulse position modulation; OOK; OPPM; PPM; bit error probability; bit error rate; chip time; direct-detection systems; multiple-user interference; on off keying; optical CDMA; optical fibre communication networks; optical orthogonal codes; overlapping PPM; performance characteristics; pulse-position modulation; receiver shot noise; throughput; union upper bound; Bit error rate; Interference; Modulation coding; Multiaccess communication; Optical modulation; Optical noise; Optical pulses; Optical receivers; Pulse modulation; Upper bound;
Conference_Titel :
Communications, 1998. ICC 98. Conference Record. 1998 IEEE International Conference on
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-4788-9
DOI :
10.1109/ICC.1998.683030
