In this paper we study the non-existence problem of (nearly) perfect (almost) m-ary
sequences via their connection to (near) Butson–Hadamard (BH) matrices and (near) …

In this paper we study almost p-ary sequences and their autocorrelation coefficients. We first
study the number ℓ of distinct out-of-phase autocorrelation coefficients for an almost p-ary …

Complex periodical sequences with lower autocorrelation values are used in CDMA
communication systems and cryptography. In this paper we present new nonexistence …

In this paper we study nearly perfect sequences (NPS) via their connection to direct product
difference sets (DPDS). We prove the connection between a $ p $-ary NPS of period $ n …

We obtain new non-existence results of perfect p-ary sequences with period n (called type
[p, n]). The first case contains a class with type [pm 5 (mod 8), pa qn']. The second case …

In this work the unsolvability of certain equations is studied in the case of cyclotomic number
fields whose ring of integers is not a principal ideal domain. Winterhof et al. considered the …

Mobil iletişimde oldukça popüler olan kod bölmeli çoklu erişim (code division multiple
access-CDMA) sisteminde her kullanıcı sinyallerini iletmek için farklı diziler kullanır. Bu …

Mobil iletişimde oldukça popüler olan kod bölmeli çoklu erişim (code division multiple
access-CDMA) sisteminde her kullanıcı sinyallerini iletmek için farklı diziler kullanır. Bu …

The topic of this dissertation are several types of generalized difference sets in abelian
groups. First, we concentrate on (q, q, q, 1)-relative difference sets with q odd, which are …

Almost p-ary perfect and nearly perfect sequences are equivalent to certain relative
difference sets and direct product difference sets, respectively. This feature enables Chee …