LDPC-Coded MIMO Optical Communication Over the Atmospheric Turbulence Channel

In this paper, coded Multiple-Input - Multiple-Output (MIMO) communication schemes for data transmission over the optical atmospheric turbulence channels are studied. Two strategies are proposed and compared. The first is based on repetition coding, and the second on Space - Time (ST) coding. Both approaches employ Low-Density Parity-Check (LDPC) codes. The LDPC codes are designed using the concept of Pairwise Balanced Design (PBD), Balanced Incomplete Block Design (BIBBD), and block - circulant (Array) codes. To improve the spectral efficiency, the authors employ a Bit-Interleaved (BI) LDPC-coded modulation based on the Pulse Amplitude Modulation (PAM).