Techniques are studied for estimation of the number of trains present, accurate direction-of-arrival (DOA) estimation, and tracking of multiple trains for the ...
Abstract—The problem of providing simultaneous high data rate communication links to multiple moving railway trains from high-altitude platforms (HAPs) ...
Data Communications to Trains From High-Altitude Platforms
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... Several advanced and novel technologies of LTE can be applied to communications for high-speed railway, since GSM for Railway will evolve to LTE for Railway ...
ABSTRACT: This paper emphasizes on the characteristics and schemes of carrier acquisition and track in high dynamic and high information-rate situation. Carrier ...
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What is haps in communication?
High-altitude platform station (HAPS) defined by the International Telecommunication Union (ITU) as "a station on an object at an altitude of 20 to 50 km and at a specified, nominal, fixed point relative to the Earth" in its ITU Radio Regulations (RR).
What is the role of high altitude platforms haps in the global wireless connectivity?
These easily deployable stations operating in the stratosphere (layer of the Earth's atmosphere starting at 20 kilometres) are high enough to provide service to a large area or to augment the capacity of other broadband service providers.
The communication services provided by HAPs can be divid- ed into two major categories: low data rate services for mobile terminals and high data rate services ...
Having a full base station on a HAP can potentially reduce signal round- trip time (RTT) thereby reducing delay as signals are fully processed in the HAP while ...
Aug 12, 2017 · 1 · Data Communications to Train From High-Altitude Platforms ; 2 · Paper ; 3 · Summary Analyze communications to multiple moving trains from High- ...
Jan 1, 2022 · New projects are making their way currently, leveraging solutions based on low altitude satellites (between 20km and 2000km whereas ...
HAP is an aircraft or balloon situated on 20-50 km above the earth. Main advantages of HAP are flexibility in deployment, low propagation delay, wide elevation ...
Fixed wireless access delivered via HAPS could provide adequate data rates to households without any wired connectivity. The lower operating altitude and ...