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Construction and Linearity of Z_pZ_{p^2}-Linear Generalized Hadamard Codes

The $\Z_p\Z_{p^2}$-additive codes are subgroups of $\Z_p^{α_1} \times \Z_{p^2}^{α_2}$, and can be seen as linear codes over $\Z_p$ when $α_2=0$, $\Z_{p^2}$-additive codes when $α_1=0$, or $\Z_2\Z_4$-additive codes when $p=2$. A $\Z_p\Z_{p^2}$-linear generalized Hadamard (GH) code is a GH code over $\Z_p$ which is the Gray map image of a $\Z_p\Z_{p^2}$-additive code. In this paper, we generalize some known results for $\Z_p\Z_{p^2}$-linear GH codes with $p=2$ to any $p\geq 3$ prime when $α_1 \neq 0$. First, we give a recursive construction of $\Z_p\Z_{p^2}$-additive GH codes of type $(α_1,α_2;t_1,t_2)$ with $t_1,t_2\geq 1$. Then, we show for which types the corresponding $\Z_p\Z_{p^2}$-linear GH codes are non-linear over $\Z_p$. Finally, according to some computational results, we see that, unlike $\Z_4$-linear GH codes, when $p\geq 3$ prime, the $\Z_{p^2}$-linear GH codes are not included in the family of $\Z_p\Z_{p^2}$-linear GH codes with $α_1\not =0$.