Multidimensional pulse-position coded-modulation for deep-space optical communication

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10 Scopus citations


In order to achieve multigigabit transmission (projected for 2020) for the use in interplanetary communications, in this letter, we propose the use of multidimensional pulse-position modulation (PPM). From Shannon's theory, we know that information capacity is a logarithmic function of signal-to-noise ratio, but a linear function of number of dimensions. By using pulse-positions as a basis function, we can improve the spectral efficiency of conventional PPM. The N-dimensional PPM (ND-PPM) can, therefore, be used to solve the high-bandwidth requirements of future deep-space optical communications. The N-dimensional signal constellation can be obtained as N-dimensional Cartesian product one-dimensional pulse-amplitude modulation constellation. The improvement of ND-PPM over PPM for N=8 in strong turbulence regime is even 3.21 dB at a bit-error rate (BER) of 10-5. In addition, the spectral efficiency of the proposed scheme is N/log2 N times better than that of PPM.

Original languageEnglish (US)
Article number5936098
Pages (from-to)1355-1357
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number18
StatePublished - 2011


  • Atmospheric turbulence
  • coded modulation
  • deep-space optical communication
  • low-density parity-check (LDPC) codes
  • multidimensional pulse-position modulation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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