Share Email Print
cover

Optical Engineering

Improved maximum likelihood detection for mitigating fading estimation error in free space optical communication
Author(s): Lu Zhang; Zhiyong Wu; Yaoyu Zhang; Huang Detian
Format Member Price Non-Member Price
PDF $20.00 $25.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

To mitigate the impact of the error between the estimated channel fading coefficient and the perfect fading coefficient on the bit error rate (BER), a priori conditional probability density function averaging the estimation error is proposed. Then, an improved maximum-likelihood (ML) symbol-by-symbol detection is derived for the free-space optical communication systems, which implement pilot symbol assisted modulation. To reduce complexity, a closed-form suboptimal improved ML detection is deduced using distribution approximation. Numerical results confirm that BER performance improvement can be reached by the improved ML detection, and that its suboptimal version performs as well as it does. Therefore, they both outperform classical ML detection, which doses not consider channel estimation error.

Paper Details

Date Published: 7 January 2013
PDF: 7 pages
Opt. Eng. 52(1) 015004 doi: 10.1117/1.OE.52.1.015004
Published in: Optical Engineering Volume 52, Issue 1
Show Author Affiliations
Lu Zhang, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Zhiyong Wu, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Yaoyu Zhang, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Huang Detian, Changchun Institute of Optics, Fine Mechanics and Physics (China)


© SPIE. Terms of Use
Back to Top