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 Primitive idempotents in the ring $F_{4}[x]/\langle x^{p^{n}}-1\rangle$ and cyclotomic $Q$ codes Bull. Korean Math. Soc. 2018 Vol. 55, No. 3, 971-997 https://doi.org/10.4134/BKMS.b170443Published online May 31, 2018 Sudhir Batra, Rekha Mathur DCR University of Science and Technology, DCR University of Science and Technology Abstract : The parity of cyclotomic numbers of order 2, 4 and 6 associated with 4-cyclotomic cosets modulo an odd prime $p$ are obtained. Hence the explicit expressions of primitive idempotents of minimal cyclic codes of length $p^{n}$, $n\ge 1$ over the quaternary field $F_{4}$ are obtained. These codes are observed to be subcodes of $Q$ codes of length $p^{n}$. Some orthogonal properties of these subcodes are discussed. The minimal cyclic codes of length 17 and 43 are also discussed and it is observed that the minimal cyclic codes of length 17 are two weight codes. Further, it is shown that a $Q$ code of prime length is always cyclotomic like a binary duadic code and it seems that there are infinitely many prime lengths for which cyclotomic $Q$ codes of order 6 exist. Keywords : cyclic codes, duadic codes, $Q$ codes, primitive idempotents, cyclotomic numbers MSC numbers : 12E20, 94B15, 11T71 Downloads: Full-text PDF