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• W2883289908 abstract "In this work, we study the multiuser detection (MUD) problem for a grant-free massive-device multiple access (MaDMA) system, where a large number of single-antenna user devices transmit sporadic data to a multi-antenna base station (BS). Specifically, we put forth two MUD schemes, termed random sparsity learning multiuser detection (RSL-MUD) and structured sparsity learning multiuser detection (SSL-MUD) for the time-slotted and non-time-slotted grant-free MaDMA systems, respectively. In the time-slotted RSL-MUD scheme, active users generate and transmit data packets with random sparsity. In the non-time-slotted SSL-MUD scheme, we introduce a sliding-window-based detection framework, and the user signals in each observation window naturally exhibit structured sparsity. We show that by exploiting the sparsity embedded in the user signals, we can recover the user activity state, the channel, and the user data in a single phase, without using pilot signals for channel estimation and/or active user identification. To this end, we develop a message-passing based statistical inference framework for the BS to blindly detect the user data without any prior knowledge of the identities and the channel state information (CSI) of the active users. Simulation results show that our RSL-MUD and SSL-MUD schemes significantly outperform their counterpart schemes in both reducing the transmission overhead and improving the error behavior of the system." @default.
• W2883289908 created "2018-08-03" @default.
• W2883289908 creator A5011615398 @default.
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• W2883289908 date "2019-07-01" @default.
• W2883289908 modified "2023-10-18" @default.
• W2883289908 title "Sparsity Learning-Based Multiuser Detection in Grant-Free Massive-Device Multiple Access" @default.
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• W2883289908 doi "https://doi.org/10.1109/twc.2019.2915955" @default.
• W2883289908 hasPublicationYear "2019" @default.
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