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In this paper, a load identification approach for dynamic wireless power transfer for electric vehicles is introduced. In the proposed method, determination of the load parameters and position are achieved without requiring any communication link between the transmitter and receiver or using any extra coil. The load detection procedure is achievable using two modes: the energy injection mode and the...
Cooperative cognitive radio (CCR) is a novel paradigm for improving both radio spectrum efficiency and communication quality. However, for the CCR networks with energy harvesting, how to achieve specific relay selection is still an open issue. In this paper, we consider a CCR network with energy harvesting in which multiple secondary transmitters are able to harvest energy from the received signals...
This paper describes bistatic and multistatic measurement using active Multistatic Primary Surveillance Radar (active MSPSR) operating in L-band. The measurement system consisted of two transmitters and one receiver. Boeing 737 departing from Pardubice airport represented the target of interest. Its detections are compared with outputs from ERA multilateration (MLAT) system deployed around Pardubice...
In this paper, a multi-user uplink channel with correlated Rayleigh fading coefficients is considered. Optimal data packet length is derived for throughput maximization of the system with stop and wait automatic repeat request (SW-ARQ). For the throughput formulation of the SW-ARQ system, the packet error rate (PER) is analytically derived using a two-state Markov chain modelling of the signal-to-interference...
To maintain tractability, interference field is often modeled as a homogeneous Poisson Point Process (PPP) in the analysis of wireless networks. While it provides meaningful firstorder results, it falls short in modeling the effect of interference management techniques, which typically introduce some form of spatial interaction among transmitters. In some applications, such as cognitive radio and...
Visual and chemical investigations in the gastro-intestinal tract using injected "pill" sized sensors are challenging. The throughput takes between 24 and 48 hours and a precise location accuracy to less than 5 cm is necessary for keyhole surgery. Model and computational experiments using a 433 MHz subsurface transmitter in a saline (conductivity = 0.2 S/m) tank show that location accuracy...
This paper proposes a new channel state based secure wireless communication mechanism to realize secure communication with a pre-equalization function in a physical layer. Researches of physical layer security have been proposed to achieve secure communication in physical layers. On the contrary, there are a few issues where terminals in a same direction can receive a message, overhead due to complex...
In this paper, we propose novel relay selection policies that aim at reducing the average delay by incorporating the buffer size of the relay nodes into the relay selection process. More specifically, we propose two delay-aware protocols that are based on the max — link relay selection protocol. First, a delay-aware only approach while it reduces the delays considerably it starves the buffers and...
Bluetooth Low Energy (BLE) is a wireless technology for exchanging data, over short distances, designed for the Internet-of-Things era. As widely supported by wearable devices, BLE has the potential to become an alternative for indoor-localization and proximity sensing. The aim of this work was to perform a thorough characterization of the RSSI-distance relationship under controlled conditions using...
Abstract-- We characterize the accuracy of a wildlife localization system that is based on the reverse-GPS or time-of-arrival (TOA) principle, in which radio receivers at known locations collaborate to determine the location of a transmitter attached to a wild animal. We describe the system in detail and show that it produces accurate location estimates in real settings and over long periods of time...
Radio frequency based device-free passive localization has been actively studied. An important issue with this technique is that a large amount of sensor nodes are usually deployed in localization environments, causing high deployment cost, high computation complexity and other drawbacks. To reduce the number of nodes while maintaining high localization accuracy, this paper proposes a fingerprint-based...
In this paper, we describe and analyze the results of a radio channel measurement campaign in an extreme industrial environment; a large open-pit copper mine targeted by next generation's highly voiced device communications. We present a practical and efficient method to perform robust and high-sensitivity impulse response measurements without a common clock reference using the widely spread USRP...
In this paper, we study the problem of resource allocation for an opportunistic spectrum-sharing channel under the assumption of statistical channel state information (CSI). More specifically, we assume that statistical CSI of the channels between both primary and secondary transmitters and the primary receiver is available at the secondary transmitter. We investigate the achievable rate maximization...
In this paper, we describe and analyze the results of a radio channel measurement campaign in an extreme industrial environment; a large open-pit copper mine targeted by next generation's highly voiced device communications. We present a practical and efficient method to perform robust and high-sensitivity impulse response measurements without a common clock reference using the widely spread USRP...
The satellite navigation is supposed to be used in applications that need coordinates generally. However we can meet a plenty of satellite signal reception problems in a real environment, often called as difficult conditions. The difficult conditions hinder reliable positioning with required accuracy, often in applications that are important for saving or securing the safety of human lives (work of...
This paper investigates the usefulness of multi-frequency received signal strength (RSS) for indoor localization. A collected set of data from four sites containing 7 frequencies from dual receivers and a high accuracy reference positioning system is presented. The collected data is also made publicly available through ResearchGate. The data is analyzed with respect to spatial variations using Gaussian...
To ensure effective teaching in electrical engineering, it is essential to provide a continuous adjustment of the practical support to the current requirements. A frequent problem is related to the process of organizing an optimum material base that would allow educators to quickly identify the appropriate items, making it possible to implement more relevant teaching aids. This paper proposes a method...
The aim of this paper is to investigate the performance of orthogonal frequency division multiplexing (OFDM) based visible light communication systems (VLC) with multiple transmitters. We have modeled our scenario with two synchronously broadcasting transmitters and a single receiver. We then incorporate the cabling delay between the transmitters that cause periodic deep fades in the frequency response...
The rapid growth of wireless systems have led to increased demand of the spectrum in the wireless services. The dynamic allocation of the wireless channel is one of the viable options which offer a great deal of scope to overcome several challenges. Cognitive Radio (CR) technology offers likelihood of dynamic allocation of spectrum by enabling unlicensed users to use the licensed spectrum in a proficient...
In this paper, we consider a downlink Multiple-Input-Multiple-Output (MIMO) cognitive radio network whereSecondary Users (SUs) are allowed to transmit concurrently withPrimary users (PUs) under an interference limit. We assume thatthe Channel State Information (CSI) required at the SecondaryBase Station (SBS) is available through a limited feedbackchannel and that it can be disturbed by estimation...
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