Title :
An adaptive threshold detector and channel parameter estimator for deep space optical communications
Author :
Mukai, Ryan ; Arabshahi, Payman ; Yan, Tsun-Yee
Author_Institution :
Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA
Abstract :
A method for optimal adaptive setting of pulse-position-modulation pulse detection thresholds, which minimizes the total probability of error for the dynamically fading optical free space channel, is presented. The threshold´s adaptive setting, in response to varying channel conditions, results in orders of magnitude improvement in probability of error, as compared to use of a fixed threshold. The adaptive threshold system itself is based on a robust channel identification system that uses average signal strengths to estimate the degree of fade and total attenuation in the channel, and a radial basis function network for estimating pulse spreads, all with excellent accuracy
Keywords :
adaptive signal detection; error statistics; fading channels; optical links; optical modulation; optical signal detection; parameter estimation; pulse position modulation; radial basis function networks; space communication links; telecommunication computing; adaptive threshold detector; adaptive threshold system; attenuation estimation; average signal strength; channel conditions; channel parameter estimator; deep space optical communications; dynamically fading optical free space channel; error probability; pulse detection thresholds; pulse spreads; pulse-position modulation; radial basis function network; robust channel identification system; Adaptive optics; Adaptive systems; Attenuation; Detectors; Fading; Optical attenuators; Optical pulses; Parameter estimation; Robustness; Signal processing;
Conference_Titel :
Global Telecommunications Conference, 2001. GLOBECOM '01. IEEE
Conference_Location :
San Antonio, TX
Print_ISBN :
0-7803-7206-9
DOI :
10.1109/GLOCOM.2001.965078
