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Mobile Reconfigurable Intelligent Surfaces for NOMA Networks: Federated Learning Approaches

https://doi.org/10.1109/TWC.2022.3181747

Zhong, Ruikang ; Liu, Xiao ; Liu, Yuanwei ; Chen, Yue ; Han, Zhu ( November 2022 , IEEE Transactions on Wireless Communications)

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Joint Pilot Allocation and Robust Transmission Design for Ultra-Dense User-Centric TDD C-RAN With Imperfect CSI

https://doi.org/10.1109/TWC.2017.2788001

Pan, Cunhua ; Mehrpouyan, Hani ; Liu, Yuanwei ; Elkashlan, Maged ; Arumugam, Nallanathan ( March 2018 , IEEE Transactions on Wireless Communications)

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Joint Pilot Allocation and Robust Beam-Vector Design for Ultra-Dense TDD C-RAN

https://doi.org/10.1109/GLOCOM.2017.8254472

Pan, Cunhua ; Mehrpouyan, Hani ; Liu, Yuanwei ; Elkashlan, Maged ; Nallanathan, Arumugam ( December 2017 , GLOBECOM 2017 - 2017 IEEE Global Communications Conference)

This paper deals with the unavailability of full CSI in ultra-dense user-centric TDD C-RAN. To reduce the channel training overhead, we consider the incomplete CSI case, where only large-scale inter-cluster CSI is available. Channel estimation for intra-cluster CSI is also considered, where we formulate a joint pilot allocation and user equipment (UE) selection problem to maximize the number of admitted UEs with fixed number of pilots. A novel pilot allocation algorithm is proposed by considering the multi-UE pilot interference. Then, we consider robust beam-vector optimization problem subject to UEs' data rate requirements and fronthaul capacity constraints, where the channel estimation error and incomplete inter-cluster CSI are considered. Simulation results demonstrate its superiority over the existing algorithms.
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Spectrum Allocation and Power Control for Non-Orthogonal Multiple Access in HetNets

https://doi.org/10.1109/TWC.2017.2716921

Zhao, Jingjing ; Liu, Yuanwei ; Chai, Kok Keong ; Nallanathan, Arumugam ; Chen, Yue ; Han, Zhu ( September 2017 , IEEE Transactions on Wireless Communications)