Intelligent reflecting surfaces at terahertz bands: channel modeling and analysis
| Autor: | Hien Quoc Ngo, Konstantinos Dovelos, Stylianos D. Assimonis, Boris Bellalta, Michail Matthaiou |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Signal Processing (eess.SP)
Power gain Beamforming Wavefront Computer science Terahertz radiation MIMO Conferences Surface waves Expression (mathematics) Meters Closed-form solutions Array signal processing FOS: Electrical engineering electronic engineering information engineering Electronic engineering Propagation losses Electrical Engineering and Systems Science - Signal Processing Efficient energy use Communication channel |
| Zdroj: | ICC Workshops |
| Popis: | An intelligent reflecting surface (IRS) at terahertz (THz) bands is expected to have a massive number of reflecting elements to compensate for the severe propagation losses. However, as the IRS size grows, the conventional far-field assumption starts becoming invalid and the spherical wavefront of the radiated waves should be taken into account. In this work, we consider a spherical wave channel model and pursue a comprehensive study of IRS-aided multiple-input multiple-output (MIMO) in terms of power gain and energy efficiency (EE). Specifically, we first analyze the power gain under beamfocusing and beamforming, and show that the latter is suboptimal even for multiple meters away from the IRS. To this end, we derive an approximate, yet accurate, closed-form expression for the loss in the power gain under beamforming. Building on the derived model, we next show that an IRS can significantly improve the EE of MIMO when it operates in the radiating near-field and performs beamfocusing. Numerical results corroborate our analysis and provide novel insights into the design and performance of IRS-assisted THz communication. To appear in 2021 IEEE International Conference on Communications Workshop |
| Databáze: | OpenAIRE |
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