Tuan-Duc Nguyen

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In wireless distributed networks, cooperative relay and cooperative multiple-input-multiple-output (MIMO) techniques can be used to exploit the spatial and temporal diversity gains to increase the performance or reduce the transmission energy consumption. The energy efficiency of cooperative MIMO and relay techniques is then very useful for the(More)
Embedding a secret message into the pixels of a cover image yields a visual distortion if these pixels belong to smooth regions. Thus, this prompted the development of some edge-based approaches in which only the edge pixels are used to hide secret bits. As a result, the visual quality of stego images is improved. However, the capacity is limited due to(More)
In the context of ubiquitous wireless sensor network, this paper presents a framework for wireless sensor networks (WSNs) designed to observe impacts of climate change in crop fields. We propose a system architecture for ubiquitous WSNs for monitoring automatically and continuously in real-time. A prototype system includes two base stations and several(More)
Wireless sensor networks where neighbor nodes can cooperate both at transmission and reception by using the cooperative multi-input multi-output (MIMO) technique are considered. Space-time diversity gain can be exploited to reduce the transmission energy consumption which is very important for average and long range transmission in wireless sensor network(More)
In the context of cooperative Multi-Input MultiOutput (MIMO) techniques for wireless sensor networks, the transmission synchronization error impact is investigated in this paper and a new space-time combination technique is proposed. Cooperative MIMO techniques have been recently studied in order to reduce the energy consumption in distributed wireless(More)
The computational complexity of matrix embedding (ME)-based steganography is high due to the use of the Hamming parity check matrix and matrix multiplication. Furthermore, with only one embedding change solution, ME cannot minimize embedding distortions when applied to joint photographic experts group (JPEG) steganography. In this paper, we propose a novel(More)
In wireless distributed networks where multiple antennas can not be installed in one wireless node, cooperative relay and cooperative Multi-Input Multi-Output (MIMO) techniques can be used to exploit the spatial and temporal diversity gain in order to reduce the energy consumption. The energy efficiency of cooperative MIMO and relay techniques is very(More)
In recent years, Wireless Sensor Network (WSN) is considered as a potential solution for real time applications in industrial automatic control. However, there are several challenges to develop real time WSN due to its wireless nature, limited resources (power, processing and memory), low node reliability and dynamic network topology. Several researches(More)