Study about LDPC codes applied in underwater laser communication
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Information and Communication Institute, Guilin University of Electronic Technology, Guilin 541004, China
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Corresponding author:
CHEN Ming-song, cms@guet.edu.cn
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Received Date:
2008-08-26
Accepted Date:
2008-10-28
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Abstract
In order to study the performance of low density parity check (LDPC) codes applied in an underwater laser communication system,its bit error rate was simulated by means of soft-decision decoding algorithm.A model of underwater laser communication channel was introduced,and then the encoding and decoding algorithm of LDPC codes was studied.For a certain code length and modulation order,the bit error rate can be reduced to 10-5 with the signal photon number ns increase.The simulation results show that the bit error rate of the system can be improved obviously by means of LDPC soft-decision decoding based on the output soft information of the photo detector.
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