Hybrid MAP and PIC Detection for OTFS Modulation

Orthogonal time frequency space (OTFS) modulation has attracted substantial attention recently due to its great potential of providing reliable communications in high-mobility scenarios. In this article, we propose a novel hybrid signal detection algorithm for OTFS modulation. Based on the system model, first derive near-optimal symbol-wise maximum xmlns:xlink="http://www.w3.org/1999/xlink">a posteriori (MAP) Then, order reduce complexity, partitioning rule that separates related received symbols into two subsets detecting each transmitted symbol, according corresponding path gains. According rule, design exploit power discrepancy subset, where MAP is applied subset with larger channel gains, while parallel interference cancellation (PIC) smaller We also provide error performance analysis proposed algorithm. Simulation results show can not only approach algorithms, but offer gain compared existing algorithms.