Design and Optimization of Downlink Massive MIMO System Based on OTFS Modulation Enabling Modified 3D-SOMP Channel Estimation

Using massive multi-input multi-output (massive MIMO) techniques in the modern wireless transmission links offers highest performance and best spectral efficiency among all the recent techniques. On the other hand, one of the most attractive modern modulation techniques is orthogonal time frequency space (OTFS) technology which is considered as a new modulation’s generation that overcome the challenges of fifth generation (5G). third proposed system implemented using a downlink massive MIMO transmission based on OTFS modulation had been proposed. An efficient channel estimation named 3D-SOMP technique had been proposed for mMIMO-OTFS system with highest performance among all related systems. To obtain better performance by using massive MIMO systems, there are different precoding techniques proposed. ZF and MMSE precoding methods demonstrated to show the best method that can be used in massive MIMO systems. Zero forcing precoding method offers the best performance with less bit error rate among the proposed methods.