Chip-Level Channel Estimation for the Downlink of a WCDMA System in Very High Mobility Environment

2009 ◽  
Vol E92-B (5) ◽  
pp. 1868-1874
Author(s):  
Ya-Yin YANG ◽  
Jin-Fu CHANG
Keyword(s):  
Channel Estimation ◽  
High Mobility ◽  
Very High

Channel estimation, equalisation, and evaluation for high-mobility airborne hyperspectral data transmission

2016 ◽  
Vol 10 (18) ◽  
pp. 2656-2662 ◽  
Author(s):  
Vahid Vahidi ◽  
Ali Pour Yazdanpanah ◽  
Ebrahim Saberinia ◽  
Emma E. Regentova
Keyword(s):  
Channel Estimation ◽  
Data Transmission ◽  
High Mobility ◽  
Hyperspectral Data

scholarly journals Comparison Between Pressure Swing Adsorption and Liquid Oxygen Enrichment Techniques in the Atacama Large Millimeter/Submillimeter Array Facility at the Chajnantor Plateau (5,050 m)

2021 ◽  
Vol 12 ◽  
Author(s):  
Ivan Lopez ◽  
Reinaldo Aravena ◽  
Daniel Soza ◽  
Alicia Morales ◽  
Silvia Riquelme ◽  
...  
Keyword(s):  
High Altitude ◽  
Pressure Swing Adsorption ◽  
Large Scale ◽  
High Mobility ◽  
Oxygen Enrichment ◽  
Oxygen Availability ◽  
Liquid Oxygen ◽  
High Altitudes ◽  
Pressure Swing ◽  
Very High

The Chilean workforce has over 200,000 people that are intermittently exposed to altitudes over 4,000 m. In 2012, the Ministry of Health provided a technical guide for high-altitude workers that included a series of actions to mitigate the effects of hypoxia. Previous studies have shown the positive effect of oxygen enrichment at high altitudes. The Atacama Large Millimeter/submillimeter Array (ALMA) radiotelescope operates at 5,050 m [Array Operations Site (AOS)] and is the only place in the world where pressure swing adsorption (PSA) and liquid oxygen technologies have been installed at a large scale. These technologies reduce the equivalent altitude by increasing oxygen availability. This study aims to perform a retrospective comparison between the use of both technologies during operation in ALMA at 5,050 m. In each condition, variables such as oxygen (O2), temperature, and humidity were continuously recorded in each AOS rooms, and cardiorespiratory variables were registered. In addition, we compared portable O2 by using continuous or demand flow during outdoor activities at very high altitudes. The outcomes showed no differences between production procedures (PSA or liquid oxygen) in regulating oxygen availability at AOS facilities. As a result, big-scale installations have difficulties reaching the appropriate O2 concentration due to leaks in high mobility areas. In addition, the PSA plant requires adequacy and maintenance to operate at a very high altitude. A continuous flow of 2–3 l/min of portable O2 is recommended at 5,050 m.

scholarly journals Fundamental Tradeoff Between Doppler Diversity and Channel Estimation Errors in SIMO High Mobility Communication Systems

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 21867-21878 ◽  
Author(s):  
Mahamuda Alhaji Mahamadu ◽  
Jingxian Wu ◽  
Zheng Ma ◽  
Weixi Zhou ◽  
Youhua Tang ◽  
...  
Keyword(s):  
Channel Estimation ◽  
Communication Systems ◽  
High Mobility ◽  
Estimation Errors ◽  
Channel Estimation Errors ◽  
Doppler Diversity
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