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The LPWAN (Low Power Wide Area Network) networks are the evolution of wireless sensor networks directed to the IoT (Internet of Things) concept, which entails sensor connectivity to the Internet. This paper presents a performance evaluation of the LoRa wireless networks. LoRa technology represents a possible solution to the problems of the IoT (Internet of Things) concept. The used frequency bands...
In the context of an increasing preoccupation to reduce the number of road accidents, wireless communications have been identified as a promising solutions in this area. This paper presents the simulation results for a Visible Light Communications (VLC) sensor envisioned for vehicular communication applications. Since the outdoor VLC channel can be affected by multiple noise sources, numerical filters...
Nowadays there is a lot of effort on the study, analysis and finding of new solutions related to high density sensor networks used as part of the IoT (Internet of Things) concept. LoRa (Long Range) is a modulation technique that enables the long-range transfer of information with a low transfer rate. This paper presents a review of the challenges and the obstacles of IoT concept with emphasis on the...
In recent years, there are many discussions about the IoT (Internet of Things) concept. LoRa (Long Range) modulation together with LoRaWAN (LoRa Wide-Area Networks) communication protocol can represent a suitable candidate ensuring a high level of performance. The main contribution of the paper is the performance evaluation of the LoRa technology considering the requirements of IoT. In the first part...
Nowadays there is a lot of effort on the study, analysis and finding of new solutions related to high density sensor networks used as part of the IoT (Internet of Things) concept. LoRa (Long Range) is a modulation technique that enables the long-range transfer of information with a low transfer rate. This paper presents a review of the challenges and the obstacles of IoT concept with emphasis on the...
This paper presents a novel visible light communication receiver architecture, designed for automotive applications. A crucial problematic in this area is the design of a suitable receiver able to face the problems caused by the dynamic situations, by the long distances and also by the environmental conditions. In such circumstances, a solution would be to adapt the communication’s data rate to channel...
In this paper a microstrip low-pass filter modeling and designed for UTMS-2100 band is presented. The full wave EM simulated and measured results are compared and a good agreement has been achieved for this low-pass filter fabricated prototypes. The measured insertion loss is 28.6 times higher for the FR4 laminate as for the reference laminate.
This paper presents an easy-to-use sensor aimed for traffic safety applications using visible light communications. A central problem in this area is the design of a suitable sensor able to enhance the conditioning of the signal and to avoid disturbances due to the environmental conditions. The visible light communication sensor proposed in this paper addresses these issues and enables a robust communication...
This paper presents a low cost and a low profile flexible microstrip patch tag antenna for UHF RFID systems that can be metal mountable. The simple design that doesn't imply using shorting pins, flexibility and small size (25mm × 50mm × 0.5mm) are a few of the advantages given by this design. The proposed antenna is simulated and the results obtained are compared with measurements performed with Agilent...
This paper relates the development of a simple metal mountable RFID tag designed for ETSI band. One important aspect given by this design is using a simplistic structure that can be adjusted for different type of IC chip impedances that exists on the market. The antenna is simulated and measured and the obtained results reveals that the tag can be compared with other prototypes, achieving good performance...
Smart City concept is a topical issue. The main contribution of this paper is the performance evaluation of topology control algorithms that can be integrated in the Smart City concept. Thus, the following topology algorithms A3, A3 Coverage and EECDS are considered. The parameters evaluated are: the number of active nodes after the topology reduction algorithm is applied, the number of packets sent...
An important aspect that should be taken into consideration when we talk about RFID systems is the antenna impedance matching. When a mismatch occurs in the antenna circuit, the power transferred from the RFID reader to its antenna is reflected, causing drastically decreasing of the tags reading distance. In this paper are analyzed some matching impedance circuits for an HF RFID reader antenna and...
This paper proposes a new architecture for outdoor low data rate visible light communication applications. Considering the performances of the digital filtering, the proposed architecture considers the usage of digital signal processing (DSP) as an alternative to the analog signal treatment. The key aspects related with the implementation of the VLC receiver are discussed and motivated through simulations...
This paper addresses the issues related with the employment of wireless communication in vehicle safety applications. It focuses on the usage of the 5.9 GHz dedicated short range communications (DSRC) under the 802.11p standard. By analyzing the theoretical and experimental literature, the paper highlights the vulnerabilities associated with the DSRC usage. Besides the radio frequency DSRC, the usage...
This paper presents the measuring of the transmission power of the WSN JN5148 transceiver, operating in the 2.4 GHz ISM band (Industrial Scientific and Medical). The measurements have been conducted in a semi-anechoic chamber and were directed at identifying the transmission power and at developing the radiation diagram. The results obtained during the tests have revealed the presence of certain irregularities...
This paper presents the field testing of a street lighting monitoring and control system. The system is based on a WSN network of the large-scale type that enables the remote control of street lighting lamps. The system also enables savings in terms of the electric power and maintenance costs. The architecture uses integrated Doppler sensors that allows for vehicle detection and help complete the...
Micro-level energy sources from the ambient environment can be a viable alternative to increase the life of the sensor nodes from a WSN network. Harvesting energy from the environment — particularly solar energy, is a technique that can support the operation of the sensor nodes. The power extracted from the luminous radiation is extremely variable, depending on day/night alternation, atmospheric conditions,...
The Visible Light Communication systems have been recently developed based on the advances in lighting semiconductor devices and added 300THz communication bandwidth to the current short-range wireless technologies family. They have a great potential for indoor as well as outdoor applications, the area of interest for our work being the communication between traffic signal infrastructure and vehicle...
This paper presents the investigation results concerning the negative effects of noise on the data signal in the case of Visible Light Communications (VLC). The motivation of this work was to offer a better understanding of the modifications of the data pulse in the presence of noise. Better understanding of the noise effect on the pulse width can help mitigate it and improve the communication performances...
This paper approaches the issues concerning the usage of the delay modulation as a coding technique used for outdoor Visible Light Communications (VLC) under PHY I layer of the IEEE 802.15.7 standard. We perform a comparative analysis between the Manchester code, as a traditional code, specified by the upper mentioned standard and the Miller code as a possible candidate for outdoor MIMO applications...
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