scholarly journals Low cost shaped beam synthesis for semi‐smart base station antennas

2016 ◽  
Vol 10 (1) ◽  
pp. 119-128 ◽  
Author(s):  
Zhijiao Chen ◽  
Clive Parini
Keyword(s):  
Low Cost ◽  
Base Station ◽  
Shaped Beam ◽  
Base Station Antennas

Rapid low-cost measurement of base-station antennas in a compact environment

2015 ◽  
Vol 57 (11) ◽  
pp. 2617-2622
Author(s):  
Soon-Soo Oh ◽  
Young-Hwan Lee ◽  
Woo-Su Kim
Keyword(s):  
Low Cost ◽  
Base Station ◽  
Base Station Antennas ◽  
Cost Measurement

scholarly journals Physical-Layer Security Improvement with Reconfigurable Intelligent Surfaces for 6G Wireless Communication Systems

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1439
Author(s):  
Janghyuk Youn ◽  
Woong Son ◽  
Bang Chul Jung
Keyword(s):  
Wireless Communication ◽  
Physical Layer Security ◽  
Communication Systems ◽  
Low Cost ◽  
Physical Layer ◽  
Base Station ◽  
Wireless Communication Systems ◽  
Secrecy Rate ◽  
Pilot Signal ◽  
Time Division

Recently, reconfigurable intelligent surfaces (RISs) have received much interest from both academia and industry due to their flexibility and cost-effectiveness in adjusting the phase and amplitude of wireless signals with low-cost passive reflecting elements. In particular, many RIS-aided techniques have been proposed to improve both data rate and energy efficiency for 6G wireless communication systems. In this paper, we propose a novel RIS-based channel randomization (RCR) technique for improving physical-layer security (PLS) for a time-division duplex (TDD) downlink cellular wire-tap network which consists of a single base station (BS) with multiple antennas, multiple legitimate pieces of user equipment (UE), multiple eavesdroppers (EVEs), and multiple RISs. We assume that only a line-of-sight (LOS) channel exists among the BS, the RISs, and the UE due to propagation characteristics of tera-hertz (THz) spectrum bands that may be used in 6G wireless communication systems. In the proposed technique, each RIS first pseudo-randomly generates multiple reflection matrices and utilizes them for both pilot signal duration (PSD) in uplink and data transmission duration (DTD) in downlink. Then, the BS estimates wireless channels of UE with reflection matrices of all RISs and selects the UE that has the best secrecy rate for each reflection matrix generated. It is shown herein that the proposed technique outperforms the conventional techniques in terms of achievable secrecy rates.

Whole-body average SAR measurement using flat phantoms for radio base station antennas and its applicability to adult and child human models

2018 ◽  
Vol 74 (1-2) ◽  
pp. 93-102 ◽  
Author(s):  
Takahiro Iyama ◽  
Teruo Onishi ◽  
Kensuke Sasaki ◽  
Tomoaki Nagaoka ◽  
Lira Hamada ◽  
...  
Keyword(s):  
Base Station ◽  
Whole Body ◽  
Human Models ◽  
Base Station Antennas
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