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IV - Extra » History » Version 5

COLIN, Tony, 12/15/2015 10:33 AM

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h1. IV - Extra
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h2. 1. CubeSat performances





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h3. 1.1 Measurement of encoding/decoding time.





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POSIX requires that CLOCKS_PER_SEC equals 1000000 independent of the actual resolution.





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p=. !Clock1.png!





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*1000 ticks per milliseconds*





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p=. !Clock2.png!





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*Time measurement of data encoding*





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p=. !Clock3.png!





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*Printing clock data*





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p=. !Time_RS_resized.PNG!





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*Chart of Reed Solomon time measurement*





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Floating-Point OPeration (FLOP)





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p=. !FLOPs2.png!





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Hence, encoding stands for *O(nbytes x NPAR)* with _nbytes_ is the codeword length, _NPAR_ the number of parity bits.





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Since it is a systematic code _nbytes = information_word_length + NPAR_ encoding stands for *O(information_word_length)* with NPAR constant.





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h3. 1.2 Busy memory on CubeSat.





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p=. !Memory.png!





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---





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Research papers proposed on IEEE Website :





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- "Transport layer coding for the land mobile satellite channel":http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=1391458&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D1391458





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- "Erasure Codes for Space Communications: Recent Findings and New Challenges":http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=6333092&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D6333092