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Decentralized coded caching is applicable in scenarios where the server does not have enough knowledge about the entire cache network to perform centralized coordination during prefetching, such as when the server is uninformed of the number of active users and their identities in a wireless or mobile environment. Most of known decentralized strategies use random uncoded prefetching followed by coded...
Localization of sensor nodes is important for wireless sensor networks (WSNs) especially for underwater WSNs (UWSNs). Among the existing UWSN localization approaches, reverse localization scheme (RLS) is an event-driven method suitable for underwater surveillance. RLS adopts the strongest arrival or the first arrival as the direct path, which is however not accurate enough due to the severe multipath...
Data aggregation is a significant issue for marine wireless sensor networks. However, marine sensors are always deployed far away from the security monitoring. Thus, the secure data aggregation for marine sensor networks emerges and attracts the researchers and engineers. Multi-signature enables the data aggregation with a single signature to authenticate the message under different signers. However,...
Recently, DCS-cast has shown an advantage in accommodating heterogeneous users over wireless networks by combining SoftCast and Distributed Compressed Sensing (DCS). However, DCS-cast's efficiency is not actually high due to its ignorance of the temporal correlation in each packet at the encoder. This paper proposes an improved scheme named DCT-DCS-cast that removes such temporal correlation through...
In this paper we present a three-tier service architecture to seizure detection and prediction based on cloud computing technology. This architecture is used for outdoor monitoring. We also propose a two-way security mechanism to protect user privacy for epilepsy patients.
A novel broadband single-layer reflectarray for satellite communications has been presented. The design and simulation results are obtained and discussed. The element in the reflectarray provides a nearly 360° linear phase range. The reflectarray is fed by a printed microstrip log-periodic dipole antenna. The broadband characteristic of the reflectarray is obtained due to the sub-wavelength of the...
In order to improve the wireless communication system reliability and throughput, the adaptive modulation and precoding joint optimization wireless communication system model is designed. Simulated experiments of this joint optimization wireless communication system model are done in VC++ environment. The experimental results show that the designed wireless communication system of LDPC code based...
Smart Wireless Video Sensor Network (SWVSN) provides a new approach for fire detection and alarm. Compare with traditional approach, the system based on SWVSN proposed in this paper has features of smart event-oriented data processing, convenient arrangement, flexible network organizing. The system consists of three layers including camera node layer, base station layer and control layer. Due to using...
This paper describes an on-line monitor system based on wireless sensor networks, which could test the ingredients of vehicles' off-gases, and also introduces the design of the hardware and software in details, and transplants the Zigbee protocol on the system at last. With the character of portability and the high precision gas sensors, the system could monitor the off-gases and distinguish the ingredients...
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