Satellite Internet(SI)provides broadband access as a critical information infrastructure in ***,with the integration of the terrestrial Internet,the influx of massive terrestrial traffic will bring significant threats...
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Satellite Internet(SI)provides broadband access as a critical information infrastructure in ***,with the integration of the terrestrial Internet,the influx of massive terrestrial traffic will bring significant threats to SI,among which DDoS attack will intensify the erosion of limited bandwidth ***,this paper proposes a DDoS attack tracking scheme using a multi-round iterative viterbi algorithm to achieve high-accuracy attack path reconstruction and fast internal source locking,protecting SI from the ***,to reduce communication overhead,the logarithmic representation of the traffic volume is added to the digests after modeling SI,generating the lightweight deviation degree to construct the observation probability matrix for the viterbi ***,the path node matrix is expanded to multi-index matrices in the viterbialgorithm to store index information for all probability values,deriving the path with non-repeatability and maximum ***,multiple rounds of iterativeviterbi tracking are performed locally to track DDoS attack based on trimming tracking *** and experimental results show that the scheme can achieve 96.8%tracking accuracy of external and internal DDoS attack at 2.5 seconds,with the communication overhead at 268KB/s,effectively protecting the limited bandwidth resources of SI.
A novel compound code is designed for the popular multidimensional (M-D) Wei trellis code [1] combined with a simple parity-check code. Using the iterativeviterbi decoding algorithm, we can achieve a remarkable perfo...
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A novel compound code is designed for the popular multidimensional (M-D) Wei trellis code [1] combined with a simple parity-check code. Using the iterativeviterbi decoding algorithm, we can achieve a remarkable performance improvement with low computational complexity. Simulation results show that at a bit error rate (BER) of 3.7 x 10(-6) about 2.2-dB additional net gain has been obtained over the conventional scheme of the 4-D 16-state NVei code at a spectral efficiency of 6.7871 bit/T.
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