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A rugged method for distance estimation based on an OFDM signal combined with the Zadoff-Chu sequences is introduced. A software algorithm extracts a coarse distance in time domain exploiting the Zadoff-Chu properties. The distance, then, is fine adjusted evaluating the time offset from the subcarriers phase. Several tests were performed in laboratory considering a very harsh indoor environment and...
Lattice codes used under the Compute-and-Forward paradigm suggest an alternative strategy for the standard Gaussian multiple-access channel (MAC). It has been proven that decoding an integer linear combination of the transmitted codewords enables higher data rates compared to decoding the messages individually. Recent work of Gasptar et al. proposed a new multiple access channel technique that they...
Mobile devices such as smartphones are becoming the majority among computing devices. Currently, millions of persons use such devices to store and process personal data. Unfortunately, smartphones running Android are increasingly being targeted by hackers and infected with malware. Anti-malware software is being used to address this situation, but it may be subverted by the same malware it aims to...
Smart grid (SG) has been recognized as a promising solution to manage and distribute electricity in the next generation power systems. The large number of devices in power systems make the wired communication a non feasible solution, thus wireless transmission becomes necessary. However this demands a huge portion of radio spectrum. In this work, we aim to provide the secure and reliable SG communication...
New multiple access techniques aim to increase the spectral efficiency by overloading the system, i.e., with those techniques the number of users served is greater than the number of system radio channels. Multicarrier-code division multiple access (MC-CDMA) allows the system to be overloaded when multiuser-maximum-likelihood-detector (MU-MLD) is used. Nevertheless, an overloaded system may be affected...
The enhancement of wireless technologies for machine-type communications and the Internet of things attracts the attention of recent communications research. The IEEE 802.11 task group TGah proposes to use group-based contention scheme in the MAC of its proposed amendment 11ah in order to cope with massive power constrained stations (STAs) per access point (AP). However the detailed regrouping technique...
This paper presents an approach to predict Quality of Experience (QoE) in WLAN networks based on information extracted from non-intrusive measurements which only require control and management frame capture. This procedure avoids costly equipment and it is forward compatible. Specifically, three measurements have been taken: the relative time duration of clear-to-send messages, the percentage of blocked...
Connectivity in vehicular networks is continuously changing due to high mobility of vehicles, causing rapid changes in the network topology. This has a direct negative impact on the throughput and packet transmission delay. Many algorithms and approaches have been proposed to address this problem. However, most of them are not practical due to their dependence on a centralized infrastructure, which...
Channel state information (CSI) is essential for efficient power and spectrum allocation policies. In cognitive radio (CR) channels, although perfect CSI of the direct link (between the secondary transmitter and the secondary receiver) is a reasonable assumption at the secondary transmitter (ST), however, perfect knowledge of its interfering links to the primary receivers (PRs) is not. Power allocation...
Coordinated multipoint transmission (CoMP) and soft frequency reuse (SFR) are two popular techniques used to control the deleterious effects caused by inter-cell interference in current 4G and envisaged 5G cellular networks. The performance of the combination of CoMP and SFR has been shown to be strongly influenced by the specific choice of the parameters governing the action of both mechanisms. Unfortunately,...
After the occurrence of a disaster one of the main needs for the rescue teams and volunteer helpers is a functional communication infrastructure even during the first hours. The disaster recovery system (DRS) originally presented by us in a previous work [1] is based on an IEEE 802.11s wireless mesh network which is set up by non damaged legacy, mesh capable and battery powered devices still available...
Although there are several tools available to simulate a Wireless sensor networks (WSN), few of them allow on-line simulation as WebShawn does. The tool can be considered as a complement of the existing experimental platforms allowing focus on implementation, collection, and analysis of data, in a relatively simple manner. The adopted software architecture is based on the remote simulation and visualization...
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