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Low Complexity Hybrid Precoding Designs for Multiuser mmWave/THz Ultra Massive MIMO Systems
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Orientador(es)
Resumo(s)
Millimeter‐wave and terahertz technologies have been attracting attention from the wireless research community since they can offer large underutilized bandwidths which can enable the support of ultra‐high‐speed connections in future wireless communication systems. While the high signal attenuation occurring at these frequencies requires the adoption of very large (or the so-called ultra‐massive) antenna arrays, in order to accomplish low complexity and low power consumption, hybrid analog/digital designs must be adopted. In this paper we present a hybrid design algorithm suitable for both mmWave and THz multiuser multiple‐input multiple‐output (MIMO) systems, which comprises separate computation steps for the digital precoder, analog precoder and multiuser interference mitigation. The design can also incorporate different analog architectures such as phase shifters, switches and inverters, antenna selection and so on. Furthermore, it is also applicable for different structures, namely fully‐connected structures, arrays of subarrays (AoSA) and dynamic arrays of subarrays (DAoSA), making it suitable for the support of ultra‐massive MIMO (UM‐MIMO) in severely hardware constrained THz systems. We will show that, by using the proposed approach, it is possible to achieve good trade‐offs between spectral efficiency and simplified implementation, even as the number of users and data streams increases.
Descrição
Funding Information: Funding: This work was supported by the FCT—Fundação para a Ciência e Tecnologia under the grant 2020.05621.BD. The authors also acknowledge the funding provided by FCT/MCTES through national funds and when applicable co‐funded EU funds under the project UIDB/50008/2020. Funding Information: This work was supported by the FCT?Funda??o para a Ci?ncia e Tecnologia under the grant 2020.05621.BD. The authors also acknowledge the funding provided by FCT/MCTES through national funds and when applicable co?funded EU funds under the project UIDB/50008/2020. Publisher Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Palavras-chave
Antenna arrays Hybrid precoding and combining Millimeter wave (mmWave) Multiuser ultra‐massive‐MIMO Terahertz (THz) Analytical Chemistry Information Systems Atomic and Molecular Physics, and Optics Biochemistry Instrumentation Electrical and Electronic Engineering