Shannon capacities and error-correction codes for optical atmospheric turbulent channels


The propagation of an ON–OFF keying modulated optical signal through an optical atmospheric turbulent channel is considered. The intensity fluctuations of the signal observed at the receiver are modeled using a gamma–gamma distribution. The capacity of this channel is determined for a wide range of turbulence conditions. For a zero inner scale, the capacity decreases monotonically as the turbulence strengthens. For non-zero inner scale, the capacity is not monotonic with turbulence strength. Two error-correction schemes, based on low-density parity-check (LDPC) codes, are investigated as a means to improve the bit-error rate (BER) performance of the system. Very large coding gains—ranging from 5.5 to 14 dB, depending on the turbulence conditions—are obtained by these LDPC codes compared with Reed–Solomon error-correction codes of similar rates and lengths. © 2005 Optical Society of America

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@inproceedings{Anguita2005ShannonCA, title={Shannon capacities and error-correction codes for optical atmospheric turbulent channels}, author={Jaime Anguita and Ivan B. Djordjevic and Mark A. Neifeld and Bane V. Vasic}, year={2005} }