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Multidimensional Pulse-Position Coded-Modulation for Deep-Space Optical Communication

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1 Author(s)
Djordjevic, I.B. ; ECE Dept., Univ. of Arizona, Tucson, AZ, USA

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/log2N times better than that of PPM.

Published in:

Photonics Technology Letters, IEEE  (Volume:23 ,  Issue: 18 )

Date of Publication:

Sept.15, 2011

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