Error coded modulation based on digital pulse modulation in optical wireless communication
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1.
Department of Strategic Missile Engineering, Naval Aeronautical and Astronautical University, Yantai 264001;
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2.
Department of Electronic Engineering, Naval Aeronautical and Astronautical University, Yantai 264001, China;
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3.
Aeronautical Military Representatives Office of Navy, Mianyang 621000, China
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Corresponding author:
WANG Hong-xing, 13371368601@cumail.Com
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Received Date:
2009-11-11
Accepted Date:
2009-12-14
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Abstract
For the sake of studying coded modulations between digital pulse modulation(DPM) and channel error coding in optical wireless communication,after introducing time domain structure of DPM,the error performances of on-off keying(OOK), pulse position modulation (PPM) and digital pulse interval modulation (DPIM) systems were analyzed with binary linear block code.Afterward computer simulations were conducted and the relationship between error correction ability of channel code and modulation level of DPM was obtained.Numerical results show that there is no matching issue for an OOK system using binary linear block code because its bijection between Hamming distance and Euclidean distance.For a PPM system,much better coding and modulation gain can be acquired if error correction number of binary linear block code is bigger than modulation level M. Especially,when error correction number is divided exactly by M,the coding gain and coding cost can get to balance.Moreover, channel code is not fit for DPIM since its variable symbol slots which cause error propagation.The conclusions can be used to help design of optical wireless link.
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