Title :
Performance comparison of number- and coherent-state optical CDMA in lossy direct-detection photon channels
Author :
Shalaby, Hossam M H
Author_Institution :
Dept. of Electr. Eng., Alexandria Univ., Egypt
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 the analysis. A comparison between the performance of the number- and coherent-state OOK/PPM-CDMA networks is also presented. The 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
Keywords :
amplitude shift keying; code division multiple access; losses; optical communication; pulse position modulation; OOK-CDMA networks; PPM-CDMA systems; bit error rate; coherent-state optical CDMA; lossy direct-detection photon channels; multiple-user interference; number-state optical CDMA; on-off keying; optical code-division multiple-access; performance; pulse-position modulation; transmission loss; Bit error rate; Error probability; Interference; Multiaccess communication; Optical detectors; Optical losses; Optical modulation; Optical pulses; Propagation losses; Pulse modulation;
Conference_Titel :
Spread Spectrum Techniques and Applications, 1994. IEEE ISSSTA '94., IEEE Third International Symposium on
Conference_Location :
Oulu
Print_ISBN :
0-7803-1750-5
DOI :
10.1109/ISSSTA.1994.379520
