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• W2967091244 abstract "In this paper, we study time-varying orthogonal frequency division multiplexing (OFDM) systems, and propose a joint channel-and-signal estimation receiver based on turbo message passing (TMP) to efficiently suppress inter-carrier interference (ICI). We establish a factor graph representation of the problem and divide the whole factor graph into two parts, one for channel estimation and the other for signal detection. For the first part, we use Gaussian message passing (GMP) for channel estimation; for the second part, a discrete state space (DSS) model is employed to describe the transition of signal states, and a forward-backward algorithm is adopted for message passing over the transition trellis in signal detection. The resulting algorithm is referred to as DSS-GMP. The complexity of DSS-GMP quickly becomes the bottleneck as the increase of the signal constellation size and the ICI width. To address this issue, we further develop a continuous-state-space (CSS) model based turbo message passing algorithm, where the messages of modulated signals are approximated as continuous Gaussian messages. Numerical results demonstrate that the TMP based scheme significantly outperforms the state-of-the-art schemes." @default.
• W2967091244 created "2019-08-22" @default.
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• W2967091244 date "2019-10-01" @default.
• W2967091244 modified "2023-10-16" @default.
• W2967091244 title "Turbo Message Passing-Based Receiver Design for Time-Varying OFDM Systems" @default.
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• W2967091244 doi "https://doi.org/10.1109/tcomm.2019.2934105" @default.
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