In this paper we present analytical performance evaluation of a dual-hop OFDM amplify-andforward (AF) variable gain (VG) relay system implementing ordered subcarrier mapping (SCM) at the relay station (R). considered to be a very interesting solution for the next generation mobile cellular networks. A scenario with no direct communication between the source of information (S) and dest... https://www.globalspecialtyfoods.com/product-category/glass-pipe/