Transmission schemes for optical telecommunications in space

Details Transmission schemes for optical telecommunications in space Transmission schemes for optical telecommunications in space

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989spie.1131...24n&link_type=abstract

IN: Optical space communication; Proceedings of the Meeting, Paris, France, Apr. 24-26, 1989 (A90-38001 16-17). Bellingham, WA,

Physics

Data Transmission, Earth Orbital Environments, Optical Communication, Semiconductor Lasers, Space Communication, Transfer Orbits, Aluminum Gallium Arsenides, Bit Error Rate, Maximum Likelihood Estimates

Scientific paper

Optical space communications efforts have focused on digital direct-detection systems for interorbit links between LEO and GEO satellites, using GaAlAs semiconductor lasers and Si avalanche photodiodes. A theoretical investigation is presently conducted to evaluate the relative receiver sensitivity of the direct-detection NRZ and quaternary pulse position modulation (QPPM) schemes. For BERs in the 10-65 Mbit range, QPPM is found to outperform NRZ by up to 2.0 dB. A maximum-likelihood detection receiver is not necessarily more difficult to implement than an NRZ threshold-detection receiver with automatic background level adjustment.

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