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In vehicular scenarios context awareness is a key enabler for road safety. However, the amount of contextual information that can be collected by a vehicle is stringently limited by the sensor technology itself (e.g., line-of-sight, coverage, weather robustness) and by the low bandwidths offered by current wireless vehicular technologies such as DSRC/802.11p. Motivated by the upsurge of research around...
The wireless power transfer (WPT) has many advantages such as convenience of energy transfer and high reliability of system. Therefore, WPT system is widely applied to IT devices, electric vehicle, and industrial application by using concrete structure. However, when is applied to reinforced concrete structure, there is a severe problem that it has very low efficiency for power transfer, which results...
NS3 is a widely used open source dynamic event driven simulator to test new ideas, algorithms and protocols for networks including LTE cellular systems as guided by 3GPP specifications. This paper presents an addition to the LTE module of NS3 by implementing a wrap around mechanism for the standard 19-site cluster. In the wrap around mechanism, the network is extended to include six additional copies...
A wireless medical biosensor using Human Body Communication(HBC)for data transmission is presented in this paper. HBC is included in the IEEE Standard 802.15.6 for Local and Metropolitan Area Network and presents the characteristic of being a new non-radio frequency type of wireless communication as it uses the human body as a transmission medium. The multiple access technique should be Time Division...
In a conventional wireless transmission system, studies are usually focus on increasing transmission rate instead of energy efficiency (EE). In this paper, we propose a hybrid transmission strategy to investigate the EE in a wireless transmission system. In this hybrid transmission strategy, the transmission mode is switched between the direct transmission (DT) mode and the amplify-and-forward relay...
Multicarrier modulation (MCM) have become a fast developing area in wireless communication system. The filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) system may be the most popular multicarrier modulation technique used for next generation wireless communication technology 5G. It has several advantages such as supporting high data rate, low impulse noise and eliminating...
In this paper, we consider a wireless point-to-point communication in the context of battery powered embedded systems with energy harvesting equipment. The successive actions taken by the transmitter constitutes the policy that it follows. In the first stage, we suppose a limited knowledge of the system behavior characterized by its probability transition matrix, and then use the policy iteration...
Recently, wireless caching techniques have been studied to satisfy lower delay requirements and offload traffic from peak periods. By storing parts of the popular files at the mobile users, users can locate some of their requested files in their own caches or the caches at their neighbors. In the latter case, when a user receives files from its neighbors, device-to-device (D2D) communication is enabled...
User Equipments (UEs) that send data must advertise the upcoming transmission by broadcasting signaling messages over the Physical Sidelink Control Channel (PSCCH). Thus, it is important for the network operator to define the PSCCH resource pool to maximize the probability that each UE will be able to successfully decode all of the control messages that appear on the PSCCH. For UEs operating in Mode...
The performance of distributed wireless communication systems is dictated by the system boundaries and the interference regimes. In this paper, we present a novel coverage and connectivity analysis of a wireless system within confined domains. Specifically, a system where the receiver connects to the nearest transmitter is analyzed. Using tools from stochastic geometry, we derive general expressions...
We consider an energy harvesting wireless communication link, where arriving data packets have different importance values. The wireless transmitter needs to decide whether each arriving data packet should be transmitted or not, based on the packet's importance value, channel condition, and energy status. Under certain conditions, we show this high dimensional control problem can be transformed to...
Energy harvesting wireless nodes provide much longer lifetime and higher energy efficiency for wireless networks compared to battery operated systems. In this paper, we study a MIMO wireless communication link in which the nodes are equipped with energy harvesters and rechargeable batteries that are continuously charging from a renewable energy source. Since the harvested energy arrival and thus the...
Small cells will play an important role in the fifth generation mobile networks. As recent works pointed out, a significant improvement in energy efficiency can be obtained if small base stations (SBSs) are provided with storage capabilities. In this paper, we study the problem of caching optimization in the presence of interference with and without cooperation between the SBSs. We consider a setup...
We derive upper and lower bounds on the secure capacity-memory tradeoff of the K-user (K > 2) wiretap erasure broadcast channel where Kw receivers are weak and have cache memories of equal size, and Ks receivers are strong and have no cache. The bounds coincide for small and large cache memories. The lower bound also exhibits that cache memories provide larger gains under a secrecy constraint than...
This paper proposes a simultaneous wireless information and power transfer (SWIPT)-based cooperative device-to-device (D2D) network, where the D2D pairs are distributed in a circular area. Such networks are particularly helpful in public safety scenarios, where battery constraints signify the need for a resource efficient communication protocol. The node distribution in the circular area is modeled...
This work explores coded caching in the symmetric K-user cache-aided MISO BC with imperfect CSIT-type feedback, for the specific case where the cache size is much smaller than the library size. Building on the recently explored synergy between caching and delayed-CSIT, and building on the tradeoff between caching and CSIT quality, the work proposes new schemes that boost the impact of small caches,...
A Kt χ Kr cache-aided wireless interference network, in which both the transmitters and the receivers are equipped with cache memories is studied. Each user requests one file from a library of N popular files. The goal is to design the cache contents without the knowledge of the particular user demands, such that all possible demand combinations can be satisfied reliably over the interference channel...
Hybrid ARQ (HARQ) and link adaptation (LA) are two powerful techniques to improve the data throughput in wireless communication systems. However, when integrated with LA, conventional HARQ does not provide much gain over LA without significantly increasing the number of retransmissions and initial coding rate. In this paper, we explore the feasibility of achieving high throughput by combining HARQ...
Internet of Things (IoT) is driving the need for wireless connectivity to unprecedented scale. High development costs and risks of ASIC development have been deterring startups and small companies to innovate and disrupt the IoT market. Software defined radio (SDR) platforms have democratized wireless innovation, allowing everyone to enter markets reserved for big players. Although SDR platforms are...
In this paper, we study self energy recycling techniques for point-to-point multiple-input multiple-output systems where a full-duplex transmitter with multiple antennas communicates with a multi-antenna receiver. Due to the full-duplex nature, the transmitter receives a signal transmitted by itself through a loop-back channel. Then, the energy of the signal is harvested and stored in an energy storage...
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