Simplified soft value extraction for M-PPM-modulated signals in FSO systems |
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Authors: | Tomaž Javornik Igor Jelovčan S. Sheikh Muhammad Gorazd Kandus |
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Affiliation: | 1. Department of Communication Systems, Jozef Stefan Institute, Jamova 39, Ljubljana, Slovenia;2. Institute of Broadband Communications, TUG Graz, Austria and FAST-NU, Lahore, Pakistan |
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Abstract: | In the following paper we propose a new approach for extracting soft values from Mth order pulse position modulation (M-PPM). A new low-complexity algorithm is developed, where soft information for each data bit is calculated based on the power received within the PPM time slots. In order to decrease the computational complexity we simplify the calculation of the conditional probability of data vector a given that PPM symbol Y is received. The Monte Carlo simulations applied to analyze the properties of the algorithm for turbo-coded M-PPM transmission in free space optic communication systems show acceptable degradation of system performance with regard to system simplification. |
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