Message Passing Based Detection for Orthogonal Time Frequency Space Modulation
YUAN Zhengdao1,LIU Fei2,GUO Qinghua3,WANG Zhongyong2
(1. The Open University of Henan, Zhengzhou 450000, China;
2. Zhengzhou University, Zhengzhou 450001, China;
3. University of Wollongong, Wollongong NSW 2522, Australia)
Abstract: The orthogonal time frequency space (OTFS) modulation has emerged as a promising modulation scheme for wireless communications in high-mobility scenarios. An efficient detector is of paramount importance to harvesting the time and frequency diversities promised by OTFS. Recently, some message passing based detectors have been developed by exploiting the features of the OTFS channel matrices. In this paper, we provide an overview of some recent message passing based OTFS detectors, compare their performance, and shed some light on potential research on the design of message passing based OTFS receivers.
Keywords: OTFS, detection, message passing, belief propagation, approximate message passing (AMP), unitary AMP (UAMP)
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