Integrated Sensing and Communication (ISAC) systems impose more stringent requirements than communication only systems. They require absolute phase coherence across the OFDM frame for reliable Doppler and angle estimation. They further rely on sub-sample timing precision to achieve fine range resolution. Additionally,...
Khethiwe Mhlope Ziwenjere, F. Scahill, Dave Townend et al.· IEEE International Symposium...· 0 citations
This paper serves as a foundation for researchers and practitioners to explore the key concepts, primary applications, and potential impacts of xApps in the open radio access network (O-RAN) architecture. We provide background information and examples related to xApps and discuss several fundamental concepts to familia...
Christof A. O. Rauber, Mohammad Asif Habibi, X. Costa-Pérez et al.· IEEE Open Journal of the Com...· 0 citations
Stacked intelligent metasurfaces (SIMs) have recently emerged as a promising architecture for large-scale beamforming systems, including cell-free massive MIMO (CF-mMIMO), due to their cost-effective wave-domain signal processing capabilities. However, existing algorithms for the joint optimization of digital and SIM-e...
Eunhyuk Park, Seok-Hwan Park, Osvaldo Simeone et al.· IEEE International Symposium...· 0 citations
A hierarchical codebook design for SIM-assisted multiuser multiple-input single-output (MISO) systems is proposed and a channel training-based protocol that identifies the optimal beam direction through cumulative selection counts is proposed.
Zhi-Heng Yu, Jian-Cheng An, Lu Gan et al.· IEEE Wireless Communications...· 0 citations
As a pivotal direction for future 6G systems, low-altitude wireless networks present a promising application ground for integrated sensing and communication (ISAC) technologies. In a typical use case where a base station performs sensing on unmanned aerial vehicles (UAVs), the system encounters new challenges including...
Rong-Hui Zhang, Yuan-Hao Cui, Zi-Ming Li et al.· IEEE Transactions on Wireles...· 0 citations
A stochastic optimization framework for RIS-aided wireless networks based on continuous versions of the cross-entropy and Metropolis-Hastings methods that directly handles continuous variables and can be readily applied to discrete settings through relaxation and projection is developed.
Davide Gagliardi, Alessio Zappone, Domenico Ciuonzo et al.· 0 citations
In integrated sensing and communication (ISAC) systems, stringent sensing performance constraints can severely limit the power available for communication. Hybrid reconfigurable intelligent surfaces (HRISs) with capabilities of both passive reflection and active signal amplification can significantly improve communicat...
Smriti Uniyal, Tian-Yu Fang, M. di Renzo et al.· 1 citation
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