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Proceedings Paper

A PSAM-based estimator of noise and fading statistics for optimum receivers of free space optics signals
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Paper Abstract

Incoherent receivers of Free Space Optical (FSO) signals have no knowledge of instantaneous channel state. Thus, the receiver requires some information about the noise and fading statistics for a maximum likelihood (ML)-based optimal detection. Using pilot-aided symbols, we develop a simple multi slot averaging (MSA) estimation technique to approximate the values of parameters required at the incoherent detector. No channel state information (CSI) is available at the receiver side and this work will not be also trying to estimate it. But the estimation of noise and fading statistics will be practically investigated. We evaluate the bit error rate (BER) performance of FSO links with MSA estimation over both Gaussian and lognormal atmospheric turbulence fading (scintillation) channels. Numerical simulation will be completed to evaluate the estimation error of the MSA estimator. We will see that at signal to noise ratio (SNR)=13dB, the performance loss of the Gaussian estimator improves from 3dB to 0.4dB when we increase the number of pilot symbols from 16 to 64. This paper also presents the hardware design of the estimator using Xilinx system generator.

Paper Details

Date Published: 26 February 2010
PDF: 10 pages
Proc. SPIE 7587, Free-Space Laser Communication Technologies XXII, 75870O (26 February 2010); doi: 10.1117/12.844906
Show Author Affiliations
Hassan Moradi, Univ. of Oklahoma (United States)
Hazem H. Refai, Univ. of Oklahoma (United States)
Peter G. LoPresti, The Univ. of Tulsa (United States)
Mohammed Atiquzzaman, Univ. of Oklahoma (United States)

Published in SPIE Proceedings Vol. 7587:
Free-Space Laser Communication Technologies XXII
Hamid Hemmati, Editor(s)

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