MPPM Constellation Selection for Free-Space Optical Communications

Trung Thanh Nguyen, Lutz Lampe
2012 IEEE Transactions on Communications  
We consider the problem of designing multipulse pulse-position modulation (MPPM) constellations whose sizes are powers of two. This problem amounts to selecting a subset from the collection of all'n w´p ossible signal points of MPPM with w pulses in n time slots. In a previous work, we have tackled this selection using combinatorial heuristics. In this letter, we further explore two new continuous optimization approaches. The first one is a modified Blahut-Arimoto algorithm. The second one is
more » ... The second one is inspired from compressed sensing. Using the constellationconstrained channel capacity as the figure of merit, numerical results from a relevant free-space optical communication example suggest that simple combinatorial heuristics yield practically the best designs. Index Terms-Multipulse pulse-position modulation (MPPM), free-space optical (FSO) communications, discrete optimization, compressed sensing.
doi:10.1109/tcomm.2012.12.100185 fatcat:2nuwsxyka5dl7dv347yb6gxxhi