Abstract
Faced with the massive connection, sporadic transmission, and small-sized data packets in future cellular communication, a grant-free non-orthogonal random access (NORA) system is considered in this paper, which could reduce the access delay and support more devices. In order to address the joint user activity detection (UAD) and channel estimation (CE) problem in the grant-free NORA system, we propose a deep neural network-aided message passing-based block sparse Bayesian learning (DNN-MP-BSBL) algorithm. In this algorithm, the message passing process is transferred from a factor graph to a deep neural network (DNN). Weights are imposed on the messages in the DNN and trained to minimize the estimation error. It is shown that the weights could alleviate the convergence problem of the MP-BSBL algorithm. Simulation results show that the proposed DNN-MP-BSBL algorithm could improve the UAD and CE accuracy with a smaller number of iterations.
Original language | English |
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Title of host publication | Proceedings - 2019 IEEE VTS Asia Pacific Wireless Communications Symposium, APWCS 2019 |
Publisher | Institute of Electrical and Electronics Engineers Inc. |
ISBN (Electronic) | 9781728112046 |
DOIs | |
Publication status | Published - Aug 2019 |
Event | 2019 IEEE VTS Asia Pacific Wireless Communications Symposium, APWCS 2019 - Singapore, Singapore Duration: Aug 28 2019 → Aug 30 2019 |
Publication series
Name | Proceedings - 2019 IEEE VTS Asia Pacific Wireless Communications Symposium, APWCS 2019 |
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Conference
Conference | 2019 IEEE VTS Asia Pacific Wireless Communications Symposium, APWCS 2019 |
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Country/Territory | Singapore |
City | Singapore |
Period | 8/28/19 → 8/30/19 |
Bibliographical note
Publisher Copyright:© 2019 IEEE.
ASJC Scopus Subject Areas
- Signal Processing
- Computer Networks and Communications
Keywords
- Channel estimation
- Deep neural network
- Grant-free
- Sparse Bayesian learning
- User activity detection