Title :
Pairwise codeword error probability for coded free-space optical communication through atmospheric turbulence channels
Author :
Zhu, Xiaoming ; Kahn, Joseph M.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., California Univ., Berkeley, CA, USA
Abstract :
In free-space optical communication links using intensity modulation/direct detection (IM/DD), atmospheric turbulence can cause signal fading. Error-control codes can help to mitigate this fading and improve system performance. To study the performance of various coding schemes, we derive an upper bound on the pairwise codeword error probability for transmission through channels with correlated turbulence-induced fading. Computing this probability involves complicated multidimensional integration. To simplify the computations, we derive an approximate upper bound under the assumption of weak turbulence. The accuracy of this approximation under weak turbulence is verified by numerical simulation. Its invalidity when applied to strong turbulence is also shown. This simple approximate upper bound to the pairwise codeword error will be useful in the study of coding for free-space optical communication through weak atmospheric turbulence channels
Keywords :
approximation theory; atmospheric light propagation; atmospheric turbulence; correlation methods; error correction codes; error statistics; fading channels; optical communication; optical links; optical modulation; optical signal detection; approximate upper bound; coded free-space optical communication; correlated turbulence-induced fading; error-control codes; free-space optical communication links; intensity modulation/direct detection; multidimensional integration; numerical simulation; pairwise codeword error probability; signal fading; strong turbulence; system performance; weak atmospheric turbulence channels; Computer errors; Decoding; Error probability; Fading; Gaussian noise; Intensity modulation; Log-normal distribution; Optical fiber communication; Signal to noise ratio; Upper bound;
Conference_Titel :
Communications, 2001. ICC 2001. IEEE International Conference on
Conference_Location :
Helsinki
Print_ISBN :
0-7803-7097-1
DOI :
10.1109/ICC.2001.936294
