Proceedings PaperTransmission Schemes For Optical Telecommunications In Space
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A theoretical investigation on optical transmission schemes for free-space applications is carried out. Receiver sensitivity of direct detection schemes like NRZ and QPPM (quaternary pulse position modulation) are evaluated. For bit rates between 10 and 65 Mbit/s, QPPM outperforms NRZ by up to 2.0 dB.