Title :
A comparison between the performance of number-state and coherent-state optical CDMA in lossy photon channels
Author :
Shalaby, Hossam M H
Author_Institution :
Dept. of Electr. Eng., Alexandria Univ., Egypt
fDate :
4/1/1995 12:00:00 AM
Abstract :
The performance of optical code-division multiple-access (CDMA) communication systems utilizing number-state light field is evaluated. Lossy direct-detection optical channels are assumed. Both on-off keying (OOK) and pulse-position modulation (PPM) schemes are investigated. For OOK, the exact bit error rate is evaluated taking into account the effect of both multiple-user interference and transmission loss. Upper and lower bounds on the bit error probability for PPM-CDMA systems are derived under the above considerations. The effect of both background and thermal noise is neglected in our analysis. Performance comparison between the number-state and coherent-state OOK/PPM-CDMA networks is also presented. Our results demonstrate that the number-state system requires less than half the energy consumed by the coherent-state one in order to attain the same performance. Lower bounds on the maximum number of simultaneous users are derived for both number- and coherent-state PPM-CDMA systems with asymptotically zero error rate
Keywords :
amplitude shift keying; code division multiple access; error statistics; interference (signal); light coherence; optical communication; optical modulation; pulse position modulation; bit error probability; bit error rate; coherent-state; direct-detection optical channels; lossy photon channels; lower bounds; multiple-user interference; number-state; on-off keying; optical CDMA; performance; pulse-position modulation; simultaneous users; transmission loss; upper bounds; Background noise; Bit error rate; Error probability; Interference; Multiaccess communication; Optical losses; Optical modulation; Optical pulses; Propagation losses; Pulse modulation;
Journal_Title :
Selected Areas in Communications, IEEE Journal on
