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Let $p$ be an odd prime, $n≥q3$ and $k$ positive integers with $e=\gcd(n,k)$. In this paper, a new family $\mathcal{S}$ of $p$-ary sequences with period $N=p^n-1$ is proposed. The sequences in $\mathcal{S}$ are constructed by adding a $p$-ary sequence to its two decimated sequences with different phase shifts. The correlation distribution among sequences in $\mathcal{S}$ is completely determined. It is shown that the maximum magnitude of nontrivial correlations of $\mathcal{S}$ is upper bounded by $p^e\sqrt{N+1}+1$, and the family size of $\mathcal{S}$ is $N^2$. Our sequence family has a large family size and low correlation.

For two odd integers $l,k$ with $0<l<k$ and $\gcd(l,k)=1$, let $m=2k$ and $d=\frac{2^{lk}+1}{2^l+1}$. In this paper, we study the cross-correlation between a binary $m$-sequence $(s_t)$ of length $2^m-1$ and its $d$-decimated sequences $(s_{dt+u}), 0≤q u<\frac{2^k+1}{3}.$ It is shown that the maximum magnitude of cross-correlation values is $2^{\frac{m}{2}+1}+1.$ Moreover, a new sequence family with maximum correlation magnitude $2^{\frac{m}{2}+1}+1$ and family size $2^{\frac{m}{2}}$ is proposed.

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