scholarly journals Interleaved-MIMO DAS for Indoor Radio Coverage: Guidelines for Planning

2014 ◽  
Vol 2014 ◽  
pp. 1-10
Author(s):  
E. M. Vitucci ◽  
F. Fuschini ◽  
V. Degli-Esposti ◽  
L. Tarlazzi
Keyword(s):  
Radio Channel ◽  
Multiple Input Multiple Output ◽  
Channel Measurements ◽  
Deployment Strategy ◽  
Indoor Coverage ◽  
Indoor Radio ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Coverage Extension ◽  
The Impact

The combination of distributed antenna systems (DAS) and multiple input multiple output (MIMO) schemes opens the way to a variety of coverage solutions for indoor environment. In this paperinterleaved-MIMO (i-MIMO) DASindoor coverage extension strategies are studied. Their performance in high-order MIMO cases is investigated in realistic conditions through LTE-A link-level simulations, based on statistical data extracted from radio channel measurements; the impact of the deployment strategy on performance is then evaluated and useful planning guidelines are derived to determine the optimum deployment for a given propagation environment.

scholarly journals MIMO SAR FORMATIONS: ORBITAL DIAMETER AND SYNCHRONIZATION TOLERANCES

2020 ◽  
Vol XLIII-B1-2020 ◽  
pp. 631-635
Author(s):  
A. Monti Guarnieri ◽  
D. Giudici ◽  
P. Guccione ◽  
M. Manzoni ◽  
F. Rocca
Keyword(s):  
Pulse Repetition Frequency ◽  
Multiple Input Multiple Output ◽  
Cost Effective ◽  
Power Resources ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Single Input ◽  
Small Antenna ◽  
Along Track ◽  
The Impact

Abstract. Multiple-Input-Multiple Output (MIMO) Synthetic Aperture Radar (SAR) along-track formations can be used to fraction the power resources into compact, lightweight and cost-effective satellites, or to extend the swath coverage beyond the limit provided by a small antenna. In this second case, the Pulse Repetition Frequency (PRF) is kept low by implementing an inversion that solves up to N−1 ambiguities, given N observations. The simultaneous illumination – that allows for the N² gain due to the coherent combination of the N transmitters and the N receivers, is analyzed and shown not to be critical, as the more than N=2 sensors are assumed. Performance is evaluated for the N=2 and N=3 cases and compared with the Single Input Multiple Output formations, where one sensor is transmitting, and all are receiving. Finally, the impact of the across-track deviation from the orbit is modeled and evaluated.

scholarly journals Impact of Probe Configurations on Maximum of Test Volume Size in 3D MIMO OTA Testing

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Weimin Wang ◽  
Huaqiang Gao ◽  
Yongle Wu ◽  
Yuanan Liu
Keyword(s):  
Channel Model ◽  
Multiple Input Multiple Output ◽  
Maximum Size ◽  
Test Volume ◽  
Multiple Input ◽  
Input Multiple Output ◽  
3D Mimo ◽  
Flexible Probe ◽  
The Impact ◽  
Volume Size

With the development of multiple-input-multiple-output (MIMO) technology, the over-the-air (OTA) testing of MIMO capable devices with different sizes needs to be conducted for performance evaluation. The device under test (DUT) should be within a tridimensional test volume created by multiprobe configurations. Thus, determining the maximum size of test volume could be vital to test the DUT of different size and larger test volumes should be adopted to evaluate larger DUTs. All types of probe configurations including the fixed and the flexible probe configurations are investigated in this paper to address this issue. The maximum of test volume size (MTVS) is determined within the given error threshold of spatial correlation for a given probe configuration. Simultaneously, the impact of different probe configurations on MTVS is studied in order to obtain larger MTVSs. Simulation results show that larger MTVSs can be obtained by utilizing the optimal probe configuration with any given 3D channel model for 3D MIMO OTA testing.

scholarly journals Ultra-Wideband MIMO Array for Penetrating Lunar Regolith Structures on the Chang’e-5 Lander

Electronics ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 8
Author(s):  
Wei Lu ◽  
Yuxi Li ◽  
Yicai Ji ◽  
Chuanjun Tang ◽  
Bin Zhou ◽  
...  
Keyword(s):  
Lunar Regolith ◽  
Multiple Input Multiple Output ◽  
Ultra Wideband ◽  
Detection Depth ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Operating Bandwidth ◽  
Exploration Mission ◽  
The Impact ◽  
Vivaldi Antennas

The Chang’e-5 lunar exploration mission of China is equipped with a Lunar Regolith Penetrating Radar (LRPR) for measuring the thickness and structures of the lunar regolith in the landing area. Since the LRPR is stationary, an ultra-wideband multiple-input multiple-output (MIMO) array is designed as a replacement for conventional mobile subsurface probing systems. The MIMO array, with 12 antenna elements and a switch matrix, operates in the frequency band from 1.0 to 4.75 GHz. In this work, the design and layout of the antenna elements were optimized with respect to the lander. To this end, the antenna elements were designed as miniaturized Vivaldi antennas with quarter elliptical slots (i.e., quarter elliptical slotted antenna, or QESA). QESAs are significantly small while being able to mitigate the impact of the lander on antenna electrical performances. QESAs also have a wide operating bandwidth, flat gain, and excellent time domain characteristics. In addition, a high-temperature resistant ultra-light radome with high transmissivity is designed to protect the external antenna array. After calibration, the MIMO array is used to detect targets embedded in volcanic ash. The detection depth reaches 2.5 m, and the detection effect is good.

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