DESIGNS CODES AND CRYPTOGRAPHY, cilt.86, sa.6, ss.1249-1255, 2018 (SCI-Expanded)
In this paper, we study -constacyclic codes over the ring where , for and . Two new Gray maps from R to are defined with the goal of obtaining new linear codes over . The Gray images of -constacyclic codes over R are determined. We then conducted a computer search and obtained many -constacyclic codes over R whose -images have better parameters than currently best-known linear codes over Z(4).