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Since one GRS used for Control and Non-Payload Communication (CNPC) of Unmanned Aerial Vehicle (UAV) cannot support all operational ranges of an UAV, the handover technology of CNPC is essential to operate an UAV in a wide range. However, the CNPC physical layer standard of Radio Technical Commission for Aeronautics (RTCA) does not have a reference signal for measuring the signal strength of a neighboring...
Wireless sensor networks have emerged as the major criteria that enable the Internet of things evolution. They have wide application range from special domain to civilian and scientific domain thus it is attracted a lot of research. Since security is of the crucial importance of wireless sensor networks, there are existed several authentication techniques for digital right management, and watermarking...
Human behaviors may change over time, but people always tend to preserve their preference. People typically like similar types of contents, for example, movies that they watch in regular intervals with the same amount of interests. On the other hand, the Internet is moving towards a content-oriented structure from the host-oriented structure. Content-Centric Networking (CCN), a content-oriented paradigm,...
Indoor localization system is an important topic in the wireless navigation system. Many technologies, such as Wi-Fi, Bluetooth, and ZigBee, have been developed for the indoor localization system; however, these systems still demonstrate poor accuracy and performance. The indoor localization system using Wi-Fi signals is the best option for indoor localization because most of the buildings are covered...
The development of the Internet and the emergence of smart devices have brought about significant changes in the existing shopping structure and shopping patterns, and have resulted in notable qualitative growth and development in everyday life of consumers. In particular, the shopping structure is changing in the form of an Omni Channel to maximize customer's purchase experience. However, since Omni...
Nowadays, loss of biodiversity and biodiversity conservation issues became an important issues that concerned by the world. The loss of biodiversity in particular region is mainly caused by low public awareness on the biodiversity. Awareness about biodiversity among people need to be raised, so that people can pay more attention on the biodiversity issues. With the raised of biodiversity awareness,...
Considering an incomplete signals acquisition due to a sparse beacon deployment, this paper proposes a generalized similarity filter to improve the performance of proximity detection and thus guarantee the quality of proximity-based service (PBS). In particular, this paper leverages Bluetooth Low Energy (BLE) Beacons to realize a PBS system which comprises a number of Proximities of Interest (PoIs)...
In recent years, GPS has been widely used as a positioning system using satellites. However, GPS receivers cannot position calculation their own positions when they can watch less than three Satellites directly. Therefore, in an environment where there are many obstacles such as urban area, there is a problem that it may be not possible to receive four or more GPS signals from GPS satellites. In this...
The overall duration of random access (RA) in millimeter-wave (mm-wave) cellular systems with directional beams is protracted because preambles should be transmitted in all directions of Tx and Rx beams. In this paper, two different types of RA preambles (RAPs; TYPE-1 and TYPE-2) are proposed with multiple antenna arrays to reduce the RA duration. It is shown by simulation that the TYPE-2 RAP is well-suited...
In this paper, a generalized OFDM (G-OFDM) which protects the out of band (OOB) leakage and satisfies the orthogonality between subcarriers is proposed for next generation wireless communications. This scheme maps many data symbols to many subchannels through filter matrix, unlike the conventional OFDM that maps a data symbol to a subchannel in a one-to-one fashion. In G-OFDM, the filter matrix is...
The LTE system that traditionally uses the licensed band have added the new technology, licensed assisted access (LAA), that enables to use 5 GHz unlicensed band with existing licensed band. Coexistence with Wi-Fi is major part of the LAA technology and regulations relating to coexistence has been revised after LAA technology emerged in Europe. Channel occupancy time (COT) is a critical parameter...
The provision of Internet connectivity for a vehicle anywhere anytime is an essential element to realize the vision of Connected Car. However, we observe that the current vehicular network technologies mainly focus on single-hop communications having limited coverage for the Internet connectivity. Accordingly, in order to support the always Internet connectivity, multi-hop routing that can cover wider...
In this paper, we propose a Mobile Crowd Sensing application based on Community Information-Centric Networking to collect opportunistic sensing data in limited area where it restricts radius of Bluetooth Low Energy beacon. The application has more valuable features by comparing with common Mobile Crowd Sensing one. First is to support data integrity and utilize simple communication model according...
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