Hybrid RF and Digital Beamformer for Cellular Networks: Algorithms, Microwave Architectures, and Measurements
| Autor: | Florian Pivit, Vijay Venkateswaran, Lei Guan |
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| Rok vydání: | 2016 |
| Předmět: |
FOS: Computer and information sciences
Beamforming Radiation Computer science business.industry Computer Science - Information Theory Information Theory (cs.IT) ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS 020208 electrical & electronic engineering 020206 networking & telecommunications 02 engineering and technology Microwave transmission Condensed Matter Physics Antenna array Base station Robustness (computer science) 0202 electrical engineering electronic engineering information engineering Cellular network Wireless Electrical and Electronic Engineering Transceiver business Algorithm |
| Zdroj: | IEEE Transactions on Microwave Theory and Techniques. 64:2226-2243 |
| ISSN: | 1557-9670 0018-9480 |
| DOI: | 10.1109/tmtt.2016.2569583 |
| Popis: | Modern wireless communication networks, particularly cellular networks utilize multiple antennas to improve the capacity and signal coverage. In these systems, typically an active transceiver is connected to each antenna. However, this one-to-one mapping between transceivers and antennas will dramatically increase the cost and complexity of a large phased antenna array system. In this paper, firstly we propose a \emph{partially adaptive} beamformer architecture where a reduced number of transceivers with a digital beamformer (DBF) is connected to an increased number of antennas through an RF beamforming network (RFBN). Then, based on the proposed architecture, we present a methodology to derive the minimum number of transceivers that are required for marco-cell and small-cell base stations, respectively. Subsequently, in order to achieve optimal beampatterns with given cellular standard requirements and RF operational constraints, we propose efficient algorithms to jointly design DBF and RFBN. Starting from the proposed algorithms, we specify generic microwave RFBNs for optimal marco-cell and small-cell networks. In order to verify the proposed approaches, we compare the performance of RFBN using simulations and anechoic chamber measurements. Experimental measurement results confirm the robustness and performance of the proposed hybrid DBF-RFBN concept eventually ensuring that theoretical multi-antenna capacity and coverage are achieved at a little incremental cost. Comment: Keywords - 5G, massive MIMO, beamforming, millimeter wave, microwave, Hybrid RF and digital beamforming, cellular networks, Butler matrix |
| Databáze: | OpenAIRE |
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