6 August 1993 Combinatorial pulse position modulation for power-efficient free-space laser communications
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Proceedings Volume 1866, Free-Space Laser Communication Technologies V; (1993) https://doi.org/10.1117/12.149237
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States
A new modulation technique called combinatorial pulse position modulation (CPPM) is presented as a power-efficient alternating to quaternary pulse position modulation (QPPM) for direct-detection, free-space laser communications. The special case of 16C4PPM is compared to QPPM in terms of data throughput and bit error rate (BER) performance for similar laser power and pulse duty cycle requirements. The increased throughput from CPPM enables the use of forward error corrective (FEC) encoding for a net decrease in the amount of laser power required for a given data throughput compared to uncoded QPPM. A specific, practical case of coded CPPM is shown to reduce the amount of power required to transmit and receive a given data sequence by at least 4.7 dB. Novel hardware techniques for maximum likelihood detection and symbol timing recovery are presented.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
James M. Budinger, James M. Budinger, Mark J. Vanderaar, Mark J. Vanderaar, Paul K. Wagner, Paul K. Wagner, Steven B. Bibyk, Steven B. Bibyk, } "Combinatorial pulse position modulation for power-efficient free-space laser communications", Proc. SPIE 1866, Free-Space Laser Communication Technologies V, (6 August 1993); doi: 10.1117/12.149237; https://doi.org/10.1117/12.149237


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