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Abstract
Free Space optical communication is the open medium and free to use full outdoor space through wireless communicationsand it has a higher capacity than that of the RF system. The performances of the FSO communication system are mainly affected due tothe atmospheric turbulence. To solve these problem the two Error Correcting Codes are used,1)low density parity check(LDPC)coding,2)Viterbi coding in these method’s the computation complexity is very high.To overcome this problem, we proposed a modified decoding algorithm using LDPC code and Viterbi code.This modified algorithm used her can reduce the computational complexity effectively, and improve the efficiency of the Free Space Optical Communication. Finally, from this simulation results we can easily see thatBER and Throughput is improving by this.