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Omnidirectional wireless power transfer (WPT) system has been studied recently due to its better user experience compared with directional WPT system. And this paper focus on resonant converter topologies study in omnidirectional WPT system. At first, three challenges of resonant converter design are identified: I. moving resonant frequency under variable coupling condition; II. voltage controllability...
Wireless charging for electric vehicles is gaining more and more popularity recently. This paper analyzes the wireless power transfer (WPT) system with a constant-voltage source and a constant-current load, which is featured in series compensation in the transmitter and parallel compensation in the receiver. The source voltage and the load current are square waves with fixed amplitudes. The closed-form...
The stray magnetic field around inductive-power-transfer coils is influenced by the phases of the transmitter's and receiver's currents. This influence is analyzed with the diagrams of phasors for the currents and magnetic fields. The dual-side-controlled converter is applied for the circuit realization, in which the bridges with MOSFETs are used for the inverter on the transmitter side and rectifier...
This paper presents a new magnetic coupler design that interconnects the plug-in isolated topologies with the Inductive Power Transfer (IPT) technology for onboard Electric Vehicles (EVs) batteries charging systems. The proposed design acts as an isolation transformer during the charge in plug-in mode, and as a conventional magnetic coupler in IPT charging mode. In this way, the system requires only...
A digital communications receiver requires precise symbol synchronization before the transmitted information can be recovered. Gardner's algorithm is a synchronizer that can acquire and track timing with only two samples per symbol, and it does not require prior carrier synchronization. In this paper, a feed-forward, all-digital version of Gardner's algorithm is presented. It is shown that this synchronizer...
This paper introduces a new innovation for the analytical model to improve the throughput performance and energy efficiency for ideal channel conditions by the integration which challenges both fountain code and Markov chain modeling. In this context, the energy consumption is a critical resource that can be saved by minimizing the number of transmissions to be performed in the network. Channel contention...
Bonus point systems are widely used for rewarding customer loyalty in both traditional and electronic commerce scenarios. Merchants aim to additionally increase revenue by targeted advertising using customer data. At the same time, customers wish to protect their privacy of what they purchase. Common systems neither provide sufficient protection of privacy, nor protect the customers' identities. Anonymity...
Software frameworks enable developers to reuse existing well tested functionalities instead of taking the burden of implementing everything from scratch. However, to meet application specific requirements, the frameworks need to be customized via extension points. This is often done by passing a framework related object as an argument to an API call. To enable such customizations, the object can be...
Encryption is often not sufficient to secure communication, since it does not hide that communication takes place or who is communicating with whom. Covert channels hide the very existence of communication enabling individuals to communicate secretly. Previous work proposed a covert channel hidden inside multi-player first person shooter online game traffic (FPSCC). FPSCC has a low bit rate, but it...
An integrated receiver chip for external photodiodes (PDs) is presented in 0.6µm BiCMOS technology with 3.3V supply voltage. It consists of an internal Automatic Gain Control (AGC), which simultaneously compensates the frequency characteristics, an internal charge pump, which delivers optionally 5V to external PDs, a detector to show whether data is received and a 50Ω differential...
In this paper, we propose a novel mixed-signal cancellation circuit for LTE carrier aggregation receivers targeting modulated spur interference. This circuit senses interference via an auxiliary analog path, and generates a reference signal for the adaptive digital cancellation. To evaluate the performance of the proposed technique, a demonstrator, realized in 28 nm LP CMOS, is shown with a cancellation...
Millimeter-wave communication in 60 GHz band is considered a promising technology to meet the explosive growth of data demand in Wi-Fi based WLAN. To address potential blockage for 60 GHz signals, multiple APs are proposed for such WLAN. This paper addresses the important problem of AP assignment and transmission scheduling for a multi-AP 60 GHz WLAN. We propose two AP assignment schemes with different...
Electric vehicles are becoming parts of our daily lives with the increasing investment from auto industry. However, their charging is an issue as this requires frequent charging and longer waiting times compared to traditional gasoline-based vehicles. The charging is typically done at residential or public charging stations. With the increased dominance of electric vehicles, one potential solution...
In this paper, we investigate multi-message authentication to combat adversaries with infinite computational capacity. An authentication framework over a wiretap channel (W_1, W_2) is proposed to achieve information-theoretic security with the same key. The proposed framework bridges the two research areas in physical (PHY) layer security: secure transmission and message authentication. Specifically,...
Non-malleable commitments, introduced by Dolev, Dwork and Naor (STOC 1991), are a fundamental cryptographic primitive, and their round complexity has been a subject of great interest. And yet, the goal of achieving non-malleable commitments with only one or two rounds} has been elusive. Pass (TCC 2013) captured this difficulty by proving important impossibility results regarding two-round non-malleable...
This paper presents a new transceiver for impulse radio ultra-wideband (IR-UWB) systems. This work is related to CHIST-ERA SMARTER project (Smart Multifunctional Architecture and Technology for Energy aware wireless sensoRs) which address autonomous wireless sensors nodes. The ultra low-power transceiver consists of an on-off keying (OOK) modulator/demodulator and a pulse generator. To reduce power...
In order to achieve high efficiency, IPT systems must work under resonance conditions. Since, the coupling coefficient is low (k<0.5) compared to a transformer, the compensation is done separately in the primary and the secondary sides. However, depending on the system, both systems can alter each other, creating pole-splitting or bifurcations. This paper presents a design criterion to ensure that...
Some enterprises would place their core business system in the enterprise network and cut off the connection with the external network, in order to prevent network attacks from outside. Enterprises often need to move business data from the external network to the enterprise network. There will be needs of across-network transmission. In this paper, a one-way transmission technology in network isolation...
This paper presents the development of a system for realizing interactive exhibitions in the context of a science and technology center. The core functionality of the system is provided by a positioning subsystem comprised of a fixed infrastructure of transmitters and a sensor worn by a user. The operating principle of the positioning system is based on inductive coupling of resonators. Information...
This paper proposed a novel multiplexing module based on LCL topology for dynamic wireless charging of electric vehicles. The LCL compensation network is widely used due to its insensitivity of output characteristics to load variation. But the design of an LCL topology requires a compensation inductor with the same value of a transmitter. The proposed multiplexing LCL module (MLM) can make the primary...
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