Numerical evaluation of PPM for deep-space links

Atsushi Waseda, Masahide Sasaki, Masahiro Takeoka, Mikio Fujiwara, Morio Toyoshima, Antonio Assalini

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


We numerically evaluate the deep-space communication performance in a broadband lossy channel of coherent pulse position modulation (PPM) with an on/off receiver, single-symbol square root detection, and Holevo information. We also consider quadrature amplitude modulation (QAM) signals and phase-shift keying signals with dyne-type detections. We show the quantitative gap between these detection strategies in terms of the capacity, particularly in the quantum-limited region where the quantum noise seriously limits the transmission rate. In particular, we find that for an extremely weak signal input power, use of a multilevel PPM system is a good strategy, whereas for an extremely strong signal, use of a multilevel QAM system is recommended.

Original languageEnglish
Article number5771616
Pages (from-to)514-521
Number of pages8
JournalJournal of Optical Communications and Networking
Issue number6
Publication statusPublished - 2011 Jun
Externally publishedYes


  • Free-space communication
  • Pulse position modulation
  • Transmission rate

ASJC Scopus subject areas

  • Computer Networks and Communications


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