Abstract
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, we employ a bit-interleaved (BI) LDPC-coded modulation
based on the pulse amplitude modulation (PAM). A better bit error rate (BER)
performance is achieved by the iteration of extrinsic information between
a demapper and LDPC decoder. The simulations show that the LDPC-coded MIMO
schemes can operate under a strong atmospheric turbulence and at the same
time provide excellent coding gains compared with the transmission of uncoded
data. To verify the efficiency of the proposed coding schemes, achievable
information rates are computed when the turbulence is modeled by a gamma–gamma
distribution.
© 2008 IEEE
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