Selection diversity for wireless optical communications with non-coherent detection without CSI

Author

Moradi, Hassan ; Refai, Hazem H. ; LoPresti, Peter G. ; Atiquzzaman, Mohammed

Author_Institution

Electr. & Comput. Eng., Univ. of Oklahoma, Tulsa, OK, USA

fYear

2010

fDate

6-10 Dec. 2010

Firstpage

1010

Lastpage

1014

Abstract

The availability of Channel State Information (CSI) at the receiver side of a Free Space Optical (FSO) link is required for optimal detection and diversity combining. Consequently, providing instantaneous CSI knowledge introduces challenges to receiver design and an increase in estimation error and bandwidth waste. In this work we investigate two selection-combining diversity schemes and their achieved gains when perfect instantaneous CSI is not available. An average SNR estimation value at the receiver is used for branch selection, and signal combining is performed with branch balance and unbalance. Channel fading is modeled as a lognormal distribution with spatially correlated samples. BER performance and outage probabilities are analytically characterized. Further, analytical results are verified using computer simulation.

Keywords

diversity reception; error statistics; fading channels; log normal distribution; optical links; optical receivers; BER performance; FSO link; SNR estimation; bandwidth waste; branch balance; branch selection; channel fading; channel state information; estimation error; free space optical link; lognormal distribution; noncoherent detection; optimal detection; outage probability; receiver; selection-combining diversity; signal combining; wireless optical communication; Channel state information (CSI); Correlated channel; Equal gain combining (EGC); Free Space Optics (FSO); Selection combining (SC); Spatial diversity;

fLanguage

English

Publisher

ieee

Conference_Titel

GLOBECOM Workshops (GC Wkshps), 2010 IEEE

Conference_Location

Miami, FL

Print_ISBN

978-1-4244-8863-6

Type

conf

DOI

10.1109/GLOCOMW.2010.5700086

Filename

5700086