Evaluation of reflected light effect for indoor wireless optical CDMA system

Author

Liu, Jiang ; Noonpakdee, Wasinee ; Takano, Hiroshi ; Shimamoto, Shigeru

Author_Institution

Grad. Sch. of Global Inf. & Telecommun. Studies, Waseda Univ., Tokyo, Japan

fYear

2011

fDate

28-31 March 2011

Firstpage

1688

Lastpage

1693

Abstract

This is a study on the effect of reflected light on optical code-division multiple-access (CDMA) system over indoor optical wireless communication (OWC). The indoor propagation channel model which takes multiple reflecting surfaces into account was addressed. Theoretical analysis of the pulse response of direct light and reflected light is given. Bit error rate (BER) of this system is analyzed considering reflected light, background light, avalanche photo-diode (APD) noise, thermal noise, and multi-user interference. The results prove that the BER of the system is influenced by the reflected light and the effect of reflected light is related to the room size and receiver position. With the increase of user number, the effect of reflected light becomes stronger and it is a significant source of inter-symbol interference. It becomes clear that when OCDMA is used to an indoor optical wireless system, the effect of reflected light is a key issue to be considered.

Keywords

avalanche photodiodes; code division multiple access; error statistics; indoor communication; intersymbol interference; optical communication; radiowave propagation; thermal noise; APD noise; BER; OCDMA; avalanche photodiode noise; background light; bit error rate; code division multiple-access system; indoor OWC; indoor optical wireless communication; indoor propagation channel model; indoor wireless optical CDMA system; intersymbol interference; multiple reflecting surface; multiuser interference; reflected light effect; thermal noise; Bit error rate; Multiaccess communication; Noise; Optical fiber communication; Optical pulses; Optical receivers;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications and Networking Conference (WCNC), 2011 IEEE

Conference_Location

Cancun, Quintana Roo

ISSN

1525-3511

Print_ISBN

978-1-61284-255-4

Type

conf

DOI

10.1109/WCNC.2011.5779389

Filename

5779389