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Combinatorial pulse position modulation for power-efficient free-space laser communicationsA new modulation technique called combinatorial pulse position modulation (CPPM) is presented as a power-efficient alternative 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. Hardware techniques for maximum likelihood detection and symbol timing recovery are presented.
Document ID
19930022667
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Budinger, James M. (NASA Lewis Research Center Cleveland, OH, United States)
Vanderaar, M. (Sverdrup Technology, Inc. Brook Park, OH., United States)
Wagner, P. (Sverdrup Technology, Inc. Brook Park, OH., United States)
Bibyk, Steven (Ohio State Univ. Columbus., United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1993
Subject Category
Communications And Radar
Report/Patent Number
NAS 1.15:106241
NASA-TM-106241
E-7961
Accession Number
93N31856
Funding Number(s)
PROJECT: RTOP 506-72-21
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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