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In the bidirectional wireless power transfer (WPT) system, each power circuit of the transmitter and the receiver part is controlled by different controllers. Therefore, to control and maintain the entire system, the output voltage phase synchronization and data transmission functions between the controllers should be implemented. The communication circuit is normally used to realize them, but this...
A high performance system design using AC coupled interconnect (ACCI) technology not only achieves shorter and faster interconnection between dies but also increases packaging density. AC-coupling enables chip placed face-to-face for signal transmission using close-field capacitive coupling. This paper describes a loopback architecture suitable for testing three-dimensional integrated circuit (3D...
Energy detection receivers are attractive in non-coherent (NC-) ultra-wideband (UWB) communication systems with pulse position modulation (PPM) due to their simplicity of implementation. In order to mitigate the impact of noise on bit error rate (BER) performance, weighted energy detection (WED) receivers were proposed for NC-PPM-UWB systems. In this paper, adaptive WED receivers are further developed...
This research aims to represent the ZigBee mesh routing and the performance under simulation environment for smart home. In the realistic smart home, researcher does not get some of the analysis and results. Hence, we designed and developed ZigBee best virtual smart home environment on Qualnet simulator. Finally, we suggest mixed-mode simulation methodology that integrates the smart home environment...
This paper presents wireless charging radiator design based on electromagnetic coupling resonant. The radiator which is developed based on microstrip technology is expected to work at center frequency of 13MHz. A circular spiral patch has been implemented to accomplish the specifications. Prior hardware realization, the performance of radiator is investigated through simulation. The optimum design...
Very small autonomous robots could cooperate to solve an almost infinite number of problems. Prototypes of such robots do already exist at the micro scale and even smaller ones are expected. Yet allowing them to wirelessly communicate considerably enhance their possible usages. In this paper, we revisit Vouivre, a nano-wireless simulation library we previously developed. Micro or nano-robots will...
Device-to-device (D2D) communications have the potential to improve spectrum efficiency and link capacity by allowing nearby devices to communicate directly with each other on the licensed frequency resource. However, the co-channel interference (CCI) among D2D pairs is the major issue that needs to be solved when they are sharing the same frequency resource. The interference alignment (IA) is an...
This paper demonstrates the effect of timing offset and carrier frequency offset (CFO) on generalized frequency division multiplexing (GFDM) systems. We provide the mathematical expressions of the received GFDM signals in condense form in the presence of timing offset and CFO using linear matrix models respectively. Furthermore, we compare the signal-to-interference ratio (SIR) performance between...
In this paper, we propose CGM-PS, a partial-decentralized, un-starving, work-conservative, and preemptive coflow scheduling scheme to shorten the Coflow Completion Time (CCT) for TCP flows in data center networks (DCNs). In CGMPS, we propose both inter- and intra- coflow scheduling policies. In inter-coflow scheduling, we present P-SEBF, which adopts a connected-graph model based novel concept Partialcoflow,...
A non-coherent 10Msps Ultra-Wideband (UWB) receiver using 3.1–5GHz pulse position modulation (PPM) signaling is implemented in a 65 nm CMOS process. The receiver is mainly comprised of low noise amplifier (LNA), squarer, integrator and comparator. All RF and baseband circuits operate at 0.5-V power supply. The chip area is 1.1mm×1.0mm. Total power dissipation is 7.44mW and 0.8nJ/bit can be achieved...
Complementing macro-only cellular networks with low-powered base stations is a promising deployment solution to cope with exploding data traffic in the coming years. In Long Term Evolution (LTE)-Advanced, interference mitigation technologies, like the linear interference rejection combining (IRC) receiver and Enhanced Inter-Cell Interference Coordination (eICIC), are introduced to address the co-channel...
Ad-hoc networks are promising complements for the infrastructure based network under disastrous scenarios. However, due to the heterogeneous surrounding environment of each user, the channel availability of each user may be quite different. Cognitive radio emerges as a promising technology to enable two users to communicate under different channel availability, by opportunistically accessing available...
This paper aims to design a tunnel road energy harvesting system, which is applied in the occasions around road tunnels such as the decelerating zones in front of road tunnels or downhill. This paper proposes design, modeling and simulation of a novel hydraulic road tunnel energy harvesting system for the purpose of harvesting energy from the road vehicle flows. The main improvement is the novel design...
Rapid developments and emergence of diverse wireless systems call for radio frontends with agile and multistandard properties. Within this publication the performance of a direct RF digitizing ΣΔ-modulator based analog-to-digital converter (ADC) is evaluated based on orthogonal frequency division multiplex (OFDM) system simulation on the bitstream layer. The necessary transmit and receive building...
In this work we present a new room impulse response simulation for spherical microphone arrays taking into account source directivity. We calculate the emission angle of the sound ray leaving the source based on the location of the image and the receiver using Allen and Berkley's image method. We provide an implementation of a room impulse response simulator for a spherical microphone array including...
An analog adaptive notch filter implementation at 54.1 MHz is presented in this paper. The analog circuit is implemented using discrete components. Implementation issues such as components phase shift and DC offset are discussed and solution for them are proposed. In addition, effect of frequency offset between reference and input signal is discussed. The implemented circuit has −3 dB bandwidth of...
We study simulation of underwater communications using acoustic signals impaired by attenuation and multipath propagation. Attenuation is sensitive to the source-receiver separation distance, sound speed profile and signal frequency. Multipath propagation is affected by reflection and refraction due to the environment boundaries, sea surface and seabed, and sound speed profile. Simulation of attenuation...
Named Data Networking (NDN) is currently a hot research topic in the field of network architecture, and its transport control mechanism is one of the key technologies needed to be studied. Since the transport in NDN network has the characteristic of multi-source, the implicit congestion detection mechanism of the traditional TCP protocol is no longer suitable for the NDN network. In this paper, we...
In this paper, a novel receiver design is proposed which combines two different approaches: decision feedback equalization (DFE) and equal gain combining (EGC). To make these two approaches work efficiently, the system is implemented in the frequency domain which can make full use of the advantages of both approaches. Simulation results demonstrate that our proposed design achieves greatly improved...
In multipath propagation scenario, Rayleigh fading is commonly modeled by Sum-Of-Sinusoid simulators. Many simulation models have been proposed in this direction, with Clarke's model as the reference model which was later simplified by Jake's model, which could not maintain the wide-sense stationary characteristics. Then an improved model was proposed by Pop and Beaulieu which was further modified...
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