Hybrid Message Passing Algorithm for Downlink FDD Massive MIMO-OFDM Channel Estimation

Song, Yi; Zhang, Chuanzong; Lu, Xinhua; Saggese, Fabio; Wang, Zhongyong

doi:10.1109/twc.2023.3320760

IEEE Trans. Wireless Commun.

2024

DOI: 10.1109/twc.2023.3320760

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Hybrid Message Passing Algorithm for Downlink FDD Massive MIMO-OFDM Channel Estimation

Yi Song,

Chuanzong Zhang,

Xinhua Lu

et al.

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Message Passing Detectors for UAV-Based Uplink Grant-Free NOMA Systems

Song,

Zhu,

Chen-Hu

et al. 2024

Drones

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Utilizing unmanned aerial vehicles (UAVs) as mobile access points or base stations has emerged as a promising solution to address the excessive traffic demands in wireless networks. This paper investigates improving the detector performance at the unmanned aerial vehicle base stations (UAV-BSs) in an uplink grant-free non-orthogonal multiple access (GF-NOMA) system by considering the activity state (AS) temporal correlation of the different user equipments (UEs) in the time domain. The Bernoulli Gaussian-Markov chain (BG-MC) probability model is used for exploiting both the sparsity and slow change characteristic of the AS of the UE. The GAMP Bernoulli Gaussian-Markov chain (GAMP-BG-MC) algorithm is proposed to improve the detector performance, which can utilize the bidirectional message passing between the neighboring time slots to fully exploit the temporally correlated AS of the UE. Furthermore, the parameters of the BG-MC model can be updated adaptively during the estimation procedure with unknown system statistics. Simulation results show that the proposed algorithm can improve the detection accuracy compared to existing methods while keeping the same order complexity.

show abstract

Message Passing Detectors for UAV-Based Uplink Grant-Free NOMA Systems

Song,

Zhu,

Chen-Hu

et al. 2024

Drones

View full text Add to dashboard Cite

show abstract

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Hybrid Message Passing Algorithm for Downlink FDD Massive MIMO-OFDM Channel Estimation

Cited by 1 publication

References 34 publications

Message Passing Detectors for UAV-Based Uplink Grant-Free NOMA Systems

Message Passing Detectors for UAV-Based Uplink Grant-Free NOMA Systems

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