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The designing of efficient signal detectors is important and yet challengefor orthogonal time frequency space (OTFS) systems in high-mobility scenarios.In this letter, we develop an efficient message feedback interferencecancellation aided unitary approximate message passing (denoted as UAMPMFIC)iterative detector, where the latest feedback messages from variable nodes areutilized for more reliable interference cancellation and performanceimprovement. A fast recursive scheme is leveraged in the proposed UAMP-MFICdetector to prevent complexity increasing. To further alleviate theerror-propagation and improve the receiver performance, we also develop thebidirectional symbol detection structures, where Turbo UAMP-MFIC detector anditerative weight UAMP-MFIC detector are proposed to efficiently fuse theestimation results of forward and backward UAMP-MFIC detectors. The simulationresults are finally provided to demonstrate performance improvement of ourproposed detectors over existing detectors.

Message Feedback Interference Cancellation Aided UAMP Iterative Detector for OTFS Systems