Title :
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
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;
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
DOI :
10.1109/VTCF.2006.385
