Soft-Decision Decoding for Differential Pulse-Position Modulation (DPPM) Over Optical Wireless Communications

Author

Sethakaset, Ubolthip ; Gulliver, T. Aaron

Author_Institution

Dept. of Electr. & Comput. Eng., Victoria Univ., Victoria, BC

fYear

2006

Firstpage

1

Lastpage

5

Abstract

In this paper, we propose a soft-decision decoding algorithm for differential pulse-position modulation (DPPM) over optical wireless communications. We describe the soft decoding algorithm which has low complexity and can be practically implemented. The performance over nondispersive and dispersive channels is evaluated. It is shown that soft decoding requires approximately 2 dB less transmit power than hard decoding in low dispersive AWGN channels. Soft decoding also provides a performance improvement in high dispersive channels.

Keywords

AWGN channels; decoding; dispersive channels; optical communication; pulse position modulation; AWGN channels; differential pulse-position modulation; dispersive channels; nondispersive channels; optical wireless communications; soft-decision decoding; Delay; Dispersion; Maximum likelihood decoding; Optical attenuators; Optical modulation; Optical pulses; Optical receivers; Optical transmitters; Pulse modulation; Wireless communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2006. VTC-2006 Fall. 2006 IEEE 64th

Conference_Location

Montreal, Que.

Print_ISBN

1-4244-0062-7

Electronic_ISBN

1-4244-0063-5

Type

conf

DOI

10.1109/VTCF.2006.385

Filename

4109650