Simplified soft value extraction for M-PPM-modulated signals in FSO systems
| Autor: | Gorazd Kandus, Tomaž Javornik, Igor Jelovcan, S. Sheikh Muhammad |
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| Rok vydání: | 2009 |
| Předmět: |
Transmission (telecommunications)
Computational complexity theory Computer science Pulse-position modulation Monte Carlo method Electronic engineering Turbo code Conditional probability Data_CODINGANDINFORMATIONTHEORY Electrical and Electronic Engineering Communications system Algorithm Power (physics) |
| Zdroj: | AEU - International Journal of Electronics and Communications. 63:595-599 |
| ISSN: | 1434-8411 |
| DOI: | 10.1016/j.aeue.2008.04.012 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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