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In this paper, we present a differential codebook design by modifying the Grassmannian codebook for a singlecell multiuser (MU) multiple-input single-output (MISO) system operating under spatially and temporally correlated channels. The differential codebook design involves scaling and rotation methods that help a codebook to track the slow varying channel. We propose an adaptive scaling technique that improves the performance of the system in correlated channels without any additional feedbackdoi:10.1109/icc.2013.6655445 dblp:conf/icc/MirzaDSS13 fatcat:tnfqbyehxrdnffdll4q5bw4m4m