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

作者：Djordjevic Ivan B^*

来源：IEEE Photonics Technology Letters, 2011, 23(18): 1355-1357.

DOI：10.1109/LPT.2011.2160940

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

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/log(2) N times better than that of PPM.

• 出版日期2011-9-15