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The ability of physical layer relay caching to increase the degrees of freedom (DoF) of a single cell was recently illustrated. In this paper, we extend this result to the case of multiple cells in which a caching relay is shared among multiple non-cooperative base stations (BSs). In particular, we show that a large DoF gain can be achieved by exploiting the benefits of having a shared relay that...
This work re-visits a recently introduced transmission technique called Packet-Appended Iteratively-Decoded Bit-Interleaved Coded Modulation (PA-BICM-ID), which consists in appending some extra signals to a legacy packet containing Gray-labeled signals. Thanks to the appendix, compatible receivers can benefit from iterative demodulation-decoding process, meanwhile the legacy packet is still acquirable...
IEEE 802.11ah is a WiFi standard developed to support M2M communications, among other things. It caters for sub 1 GHz long range transmissions. However, this long range exacerbates the hidden node problem. Sectorization and grouping have been proposed to mitigate the hidden node problem. Sectorization can also be used to eliminate the overlapping basic service set problem. In this paper, we create...
The emergence of mobile health (mHealth) systems has risen the challenges and concerns due to the sensitivity of the data involved in such systems. It is essential to ensure that these data are well delivered to the health monitoring center for accurate and perfect diagnosis and follow-up. Due to the wireless network constraints, these requirements become more challenging. In this paper, we propose...
This paper presents an incremental cooperative communication scheme for a buffer-aided three node relay network consisting of a source, an Amplify and Forward (AF) relay and a destination. We consider the presence of direct link and propose a scheme which is based on the concept of packet diversity rather than link diversity. The scheme is designed in such a way that packets that experienced bad channel...
The growing synergy between engineering applications and medical science has resulted in the development of effective health care services and applications responsible for higher quality of living for the world's elderly. The growing numbers of elderly demands more efficient system to monitor patients, especially those with degenerative and chronic diseases constrained to indoor healthcare environments...
In this paper, we design a unified framework decoder for relay systems with iterative decoding. In the proposed scheme, the source node needs to transmit a correlated content to a destination with the help of a relay. Then, a distributed Joint Source Channel (JSC) Low-Density-Parity-Check (LDPC) encoding is applied at the source and the relay. The destination receives simultaneously the source compressed...
MANETs have been focusing the interest of researchers for several years. The new scenarios where MANETs are being deployed make that several challenging issues remain open: node scalability, energy efficiency, network lifetime, Quality of Service (QoS), network overhead, data privacy and security, and effective routing. This latter is often seen as key since it frequently constrains the performance...
The social network being one of the most disruptive innovations of the last decade has gathered a huge amount of attention of the people. The posts of the users of the social media are used by many companies in the world to find the mentality of the users, the current trend of the market and many more things. But still, there is a latent potential in the social network. One of the aspect that we were...
Delay Tolerant Network (DTN) has the potential to connect nodes in an environment where an end-to-end path may not be available between source and destination. Resources constraint is among the most serious issues in DTN. In this paper, we consider the scenario where we want to transmit an information (message) from a source to a group of people in the network area. Using the epidemic routing protocol...
Quite recently, considerable attention has been paid to pedestrian navigation services, since they provide people with guidance and tracking information everywhere especially in an unfamiliar environment. In the literature, indoor and outdoor navigation has been widely investigated. However, studies on the continuity of pedestrian navigation service, still lacking. This paper presents a novel positioning...
In this paper, we present a data-driven solution to address the energy efficient routing problem in a multi-layer femtocell network. The basic idea is to divide problems into categories by the clustering of traffic demand vectors, and solve a problem by a most suitable algorithm, in terms of throughput, energy consumption and computation time, corresponding to its category. The simulation results...
Localization of a user in a wireless network is challenging in the presence of malfunctioning or malicious reference nodes, since if they are not accounted for, large localization errors can ensue. We evaluate three Bayesian methods to statistically identify outliers during localization: an exact method, an expectation maximization (EM) method proposed earlier, and a new method based on Variational...
The next mobile generation is featured by extreme densities of cell stations to overcome the higher future demand. Hence, interference management is a crucial challenge in ultra-dense cellular networks. In contrast to the classical inter-cell interference coordination approach, which is no longer fit for the high density of cell-tiers, this paper proposes a novel virtual coordination based on the...
In this paper, we consider bidirectional decode-and-forward (DF) buffer-aided relay selection and transmission power allocation schemes for underlay cognitive radio (CR) relay networks. First, a low complexity delay-constrained bidirectional relaying protocol is proposed. The proposed protocol maximizes the single-hop normalized sum of the primary network (PN) and secondary network (SN) rates and...
This work investigates the end-to-end performance of a free space optical amplify-and-forward (AF) fixed-gain relaying system using heterodyne detection over misaligned general Malaga turbulence channels. More specifically, we present exact closed-form expressions for average bit-error rate achievable spectral efficiency non-adaptive/adaptive modulation schemes by employing generalized power series...
Covert timing channels provide a mechanism to transmit unauthorized information across different processes. Applications that generate large datasets allow this information to be easily hidden within the big data, making it difficult to detect. In this paper, we introduce the application of big data analysis techniques, specifically MapReduce, in the process of speeding up the performance of covert...
Vehicular cloud computing is a new paradigm that integrates VANET and cloud computing. It refers to the vehicles' use of outside resources: they access to the conventional cloud or cooperate with other vehicles by sharing their resources (i.e. formation of a temporary vehicular cloud). Both these two ways induce different costs such as expensive cellular links in the case of access to the conventional...
Because of a scarcity of bandwidth due to explosive growth of mobile devices in 5G, offloading computing workload to WiFi devices can be a feasible solution. In addition, for reasons of battery capacity limitation of mobile device, wireless energy harvesting technologies play an important role in case the battery runs out in the middle of offloading processes. Thus, in this paper, to reduce both the...
In urban areas, traffic congestion is a challenging problem which creates many complications to travelers. Unattended congestion in roadways will cause long waiting times and affects individual economy. It also creates environmental issues and affects personal health. In recent years, the development of Vehicular Ad-hoc Network (VANET) provides a promising solutions for handling the congestion in...
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