Abstract

Direct-detection optical code-division multiple-access (CDMA) systems employing overlapping pulse-position modulation (OPPM) schemes are proposed. Both upper and lower bounds on the bit error rate (BER) are derived taking into account the effect of both multiple-user interference and receiver shot noise. The photodiodes' dark currents are neglected since their effect is minor. The throughput limitation of this system is evaluated as well. Performance characteristics are then compared to optical CDMA systems employing traditional ON-OFF keying (OOK) and pulse-position modulation (PPM) schemes. It is shown that under fixed data rate and chip time, OPPM-CDMA system superperforms both traditional systems. Moreover, it is shown that the throughput limitation of OPPM-CDMA is almost 6.7 times greater than that of OOK-CDMA.

[IEEE ]

Performance Analysis of Slotted ALOHA Random Access Packet-Switching Optical CDMA Networks Using Generalized Optical Orthogonal Codes and M-ary Overlapping PPM Signaling

Mohammad A. Shoaie, Simin Khazraei, and Mohammad R. Pakravan
J. Opt. Commun. Netw. 3(7) 568-576 (2011)

Generalized OOC Assisted PPM and Overlapping PPM, Considering Thermal Noise and APD Effect

Simin Khazraei and Mohammad Reza Pakravan
J. Opt. Commun. Netw. 5(7) 696-703 (2013)

Performance improvement of FSO/CDMA systems over dispersive turbulence channel using multi-wavelength PPM signaling

Ngoc T. Dang and Anh T. Pham
Opt. Express 20(24) 26786-26797 (2012)

Design Concepts and Performance Analysis of Multicarrier CDMA for Indoor Visible Light Communications

Morteza H. Shoreh, Ahmad Fallahpour, and Jawad A. Salehi
J. Opt. Commun. Netw. 7(6) 554-562 (2015)

Performance analysis of a PPM-FSO communication system with an avalanche photodiode receiver over atmospheric turbulence channels with aperture averaging

Huihua Fu, Ping Wang, Tao Liu, Tian Cao, Lixin Guo, and Jiao Qin
Appl. Opt. 56(23) 6432-6439 (2017)