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To enhance the complexity of the chaos, improve the characteristics of chaos, and increase the number of chaotic types, a simple method is put forward in this paper. This method does not need to change the existing chaotic system, but just makes a nonlinear transformation to the chaotic signal by a unary polynomial. The nonlinear transformation has the characteristic that its physical circuit is easy...
The family of Zetterberg codes with parameters (2u+1, 2u+1-2u) for even u is one of the best known double error correcting codes because of their large code rate and high decoding speed. In this letter, we prove that when u is odd, Zetterberg codes can correct all errors of weight at most two with only 2u+1 exceptions. Moreover, by multiplying (x-1) to the generator polynomials of Zetterberg codes...
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