Linear complexity and trace representation of quaternary sequences over Z4\mathbb{Z}_4 based on generalized cyclotomic classes modulo pqpq

We define a family of quaternary sequences over the residue class ring modulo $4$ of length $pq$, a product of two distinct odd primes, using the generalized cyclotomic classes modulo $pq$ and calculate the discrete Fourier transform (DFT) of the sequences. The DFT helps us to determine the exact values of linear complexity and the trace representation of the sequences.Comment: 16 page

Corrigendum to New Generalized Cyclotomic Binary Sequences of Period p2p^2

New generalized cyclotomic binary sequences of period $p^2$ are proposed in this paper, where $p$ is an odd prime. The sequences are almost balanced and their linear complexity is determined. The result shows that the proposed sequences have very large linear complexity if $p$ is a non-Wieferich prime.Comment: In the appended corrigendum, we pointed out that the proof of Lemma 6 in the paper only holds for $f=2$ and gave a proof for any $f=2^r$ when $p$ is a non-Wieferich prim