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The application of Wireless Power Transfer (WPT) systems is primarily limited by its energy transfer efficiency. For modern WPT that utilises Strongly Coupled Magnetic Resonances (SCMR), which transfers energy by using the mutual inductance between coils, a higher efficiency can be achieved compared with a conventional air-core transformer module. An SCMR normally works at a desired frequency which...
This paper presents a novel electric vehicle (EV) dynamic wireless charging (DWC) research platform solution. Conventional solution tends to build a low speed, space-occupying, power-derating system, which does not accurately reflect the dynamic process of on-board wireless charger at high travelling speed. Considering the receiver-side open circuit voltage equivalent, the proposed solution simulates...
With the huge develop of low consumption wireless devices both for industry and human wellness and comfort, such as Wireless Body Area Network for health active care and Wireless Sensors Networks for industry environments, new challenges are proposed for the both industry and scientific community. Security is one of this matters. Given the specific characteristics of the low consumptions modern devices,...
In the conventional directional modulation (DM) system without relay aiding, when the eavesdropper locates within the main-beam of the desired direction, it can intercept the confidential message from source Alice. In this paper, we propose a strategy to enhance physical-layer security of direction modulation in wireless transmission with the help of multi-relay cooperation. In this scenario, the...
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...
The filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) is considered as a most efficient technique for next wireless communication systems 5G due to its higher spectral bandwidth efficiency, robustness to frequency-selective fading channels, etc. However, the biggest disadvantage to working with FBMC system is its high peak-to-average power ratio (PAPR) leads to severe...
There is a growing need for government agencies to prevent crimes and terror attacks by legitimately monitoring suspicious communication links. In this paper, two concepts named eavesdropping rate and eavesdropping outage probability are defined to evaluate the eavesdropping performance of legitimate monitor. Against the energy-ratio-based detection exploited by suspicious users, a hybrid eavesdropping...
This paper studies an uplink simultaneous wireless information and power transfer (SWIPT) system with non-orthogonal multiple access (NOMA), consisting of two users and one energy-harvesting access point (AP). The users transmit their independent information simultaneously to the AP which harvests energy and decodes information at the same time by dynamic power splitting (DPS). We focus on the ergodic...
In this paper, we propose a wireless battery charging system which the power transfer position can be automatically moved to the optimal charging placement. The proposed charging system is based on the electromagnetic inductive power transfer technique which is a short distance power transfer system. As a result, we have successfully finished the implementation of the proposed wireless battery charging...
This paper describes the research made in order to realize a wireless energy transfer system used for mobile phones using electrically separated circuits. To carry out this study we used different types for wireless power transfer circuits: the first circuit works at a frequency of 128 kHz and the second circuit works at a frequency of 1.7 MHz. All circuits were made with an electronic software design...
The design scheme of a wireless code update system based on the tire pressure transmitter is presented by the introduction of tire pressure monitoring transmitter working environment and structure. The scheme consists of microprocessor, low frequency LF transmitter and high frequency RF receiver. The binary data of low frequency LF transmitter is responsible for sending flash, high frequency RF receiver...
Due to the broadcast nature of the wireless medium, private communications are easily eavesdropped. This has spurred extensive research into secret key establishment using physical layer characteristics of wireless channels. In all these schemes, the shared secret keys directly originate from the physical features of the real wireless channel, which is highly dependent on the communication environment...
In order to overcome the limitations of conventional ultrasound endoscope, we propose to develop a capsule ultrasound (CUS) device: an ingestible and disposable pill to inspect the multiple layers of the entire gastrointestinal (GI) tract as well as its surrounding organs, and to provide a convenient method for diagnosing GI diseases, such as abdominal cancers and lesions. The CUS device is composed...
Communications security has become an integral part of wireless networks. A commonly known method to attain secrecy of information is done by addition of noise to corrupt the intruder's channel. In this paper, we undertake the principle of multiple inter-symbol obfuscation (MIO) method to improve security in wireless based communication in the last level of the OSI (Open System Interconnect) model,...
In this work, a self-sustainable transmission approach for orthogonal frequency division multiple access (OFDMA) receiver is considered, to extend the battery life of the receiver. This is achieved by exploiting the redundant part of OFDMA block structure, that is, cyclic prefix (CP). The self-sustainability level is analyzed by considering the effect of power budget at the transmitter, the power...
This paper presents a lossless sensor data compression accelerator for power reduction in wireless body sensors. First, a low complexity compression algorithm is demonstrated for the first time on electrocardiogram (ECG) and acceleration sensor data. Second, the algorithm is implemented as a custom hardware accelerator on a health monitoring driven System on Chip (SoC) in a 130 nm process. The accelerator...
In this work, communication over a time-correlated point-to-point wireless channel is studied for an energy harvesting (EH) transmitter. In this model, we take into account the time and energy cost of acquiring channel state information. At the beginning of the time slot, the EH transmitter, has to choose among three possible actions: i) deferring the transmission to save its energy for future use,...
One of the main issues, in the specification of the 5G radio access network (RAN) technology, is the design of a new waveform, overcoming the limitations of the CP-OFDM in terms of frequency localization, spectral efficiency and robustness to users asynchronism, while keeping low latency and reduced transceiver implementation complexity. In the last decade, many waveforms have been proposed in order...
Wireless or contactless electrical energy transfer is a method of utilizing electromagnetic induction to transfer electrical power from the source (transmitter) to the loads (receivers) without using the conventional media, such as wires. This method had been investigated since end of 18 century, and Nikola Tesla was the first scientist to realize it. The development of technology increases the usage...
Recently, bulk-data or burst transmission has been the focus of research in wireless sensor networks. The aim is to benefit applications which require high throughput but small scale deployment. Healthcare applications and applications which are intended to support independent living for the elderly are typical examples. The main idea is to exclusively provide the channel for one transmitter only...
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