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Linear Complexities of Sequences over Unknown Symbol Sets and Constructions of Sequences over CF($p^k$) whose Characteristic Polynomials are over GF($p^{k}$ )  

Hong, Yun-Pyo (Dept.of Electric Electronics Engineering, Graduate School of Yonsei University)
Eun, Yu-Chang (Dept.of Electric Electronics Engineering, Graduate School of Yonsei University)
Kim, Jeong-Heon (Samsung Electronics Corporation)
Song, Hong-Yeop (Dept.of Electric Electronics Engineering, Graduate School of Yonsei University)
Abstract
We propose an appropriate approach of defining the linear complexities (LC) of sequences over unknown symbol set. We are able to characterize those p-ary sequences whose R-tuple versions now eve. GF($p^{R}$ ) have the same characteristic polynomial as the original with respect to any basis. This leads to a construction of $p^{R}$ -ary sequences whose characteristic polynomial is essentially over GF(p). In addition, we can characterize those $p^{R}$ -ary sequences whose characteristic polynomials are uniquely determined when symbols are represented as R-tuples over GF(p) with respect to any basis.
Keywords
Linear Complexity; Frequency-Hopping Patterns; Linear Feedback Shift Register; $p^k$-ary sequences;
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