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To adequately support high-throughput applications in next-generation WLANs, more spectrum will be needed to accommodate wider channels. To address this issue, spectrum regulators and stakeholders from the wireless industry and the intelligent transportation system communities are exploring possible band sharing approaches in the 5.9 GHz band. Such approaches include techniques that enable the harmonious...
This paper considers a cellular multiple-input multiple-output multiple-eavesdropper (MIMOME) channel, with a pair of single-antenna device-to-device (D2D) nodes working as an underlay. A novel eavesdropping scenario is studied in this paper, where the eavesdroppers intend to simultaneously overhear the cellular communication and the D2D communication. Our goal is to jointly optimize the covariance...
This paper studies resource allocation for energy-efficient device-to-device (D2D) communications in an overlay wireless cellular networks, where a D2D transmitter first harvests energy from a base station (BS) and then communicates with a D2D receiver. The resource allocation algorithm design is formulated as a non-convex optimization problem for the maximization of the energy efficiency (bits/Joule)...
This paper presents an inductive power transfer system for implantable medical devices. The system features a DC/DC converter in transmitting side, and a load voltage monitoring circuit in receiving side, plus a communication mechanism that utilizes the power coils. The load voltage monitoring circuit detects the voltage on the load and once it is out of nominal range, an alert is sent to the transmitter...
This paper proposes that parasitic eddy currents can be utilized to facilitate and possibly enhance the power transfer capability of systems that utilize Near Field Magnetic Coupling (NFMC) for wireless charging. A proof of concept is provided where a receiver coil of diameter 27 mm harnesses more than 10W rectified power with greater than 60% AC-DC efficiency, while located within a dominantly metallic...
The broadcast nature of wireless communication make it intrinsically vulnerable to jamming and eavesdropping attacks. Spread-spectrum techniques spread narrowband signals over a wide bandwidth, and provide good resistance to noise and jamming attacks. However, spread-spectrum signals can still be intercepted if their used spreading codes are known. To tackle this issue, this paper proposes a lightweight...
This paper studies the difference between retro-directive beamforming technique and retro-reflective beamforming technique in the context of wireless power transmission applications. In all of our studies, a wireless power receiver broadcasts continuous-wave pilot signal, the wireless power transmitter receives and analyzes the pilot signal, and finally the wireless power transmitter transmits continuous-wave...
Wireless energy harvesting (EH) is regarded as a promising energy supply alternative for energy-constrained wireless networks. In this paper, a new wireless EH protocol is proposed for an underlay cognitive radio (CR) network with multiple transceivers in a primary network (PN). Utilizing two-way amplify-and-forward (AF) relaying system as a secondary network (SN), both end-sources can harvest energy...
In this work, an on-off keying (OOK) modulator operating in the 2.36-GHz MedRadio band for a 16-channel neural implant is proposed. The modulator utilizing direct-modulation scheme at the data rate of 10 Mbps is composed of a 5-bit digital-to-analog converter (DAC) and a current-reuse voltage-controlled oscillator (VCO) with the supply voltage of 0.9 V. The chip was fabricated in CMOS 0.18-µm technology,...
Sensors and network association devices are typically embedded within the smart-phones to support its performance. The Accelerometer-Sensor one among the various sensors embedded in Smart-Devices. Each swinging movement or rotation are going to be scan by the measuring system detector, then, is employed to alter the orientation of the phone show. On the opposite hand, Bluetooth could be a wireless...
The concept of Wireless Body Area Network (WBAN) technology holds great potential for many applications such as continuous, remote, healthcare monitoring. Motion activities associated with the head reveal important physiological information about the health of the user. In order to develop a system capable of tracking and characterizing these activities, a fundamental understanding of the propagation...
In this work, we consider a scenario wherein an energy harvesting wireless radio equipment sends information to multiple receivers alongside powering them. In addition to harvesting the incoming radio frequency (RF) energy, the receivers also harvest energy from its environment (e.g., solar energy). This communication framework is captured by a fading Gaussian Broadcast Channel (GBC) with energy harvesting...
The transcutaneous power transfer for the artificial heart can be done by the principle of mutual induction. The primary coil and secondary coil present in this transformer should be positioned in such a way to enable the transfer of power from transmitter section to the receiver section wirelessly. The mutual induction process will take place when we keep both the coils parallel. The receiver coil...
The impressive growth of secrecy-sensitive wireless applications calls for methods to complement traditional cryptography. In particular, physical-layer security is attractive to enhance communication confidentiality by exploiting the characteristics of the wireless environment. Recent works on information-theoretic wireless network secrecy have shown how to exploit interference to enhance the level...
This paper presents propagation modelling of different on-body and off-body wireless communication scenarios for dairy cows in barns at 2.4 GHz. Based on the obtained propagation models, a WBAN that monitors multiple heath parameters is designed for optimal performances in terms of energy efficiency and packet error rate.
Currently, Visible Light Communication (VLC) technology remains a lagging research in the field of UltraWide Band (UWB), due to the inefficiency of data capture and synchronization period. Accordingly, this paper proposes a fundamental designand implementation of data communication of VLC on the MAC layer based on FPGA. This paper includes basic research context, design and implementation of UWB MAC...
The work in this manuscript proposes to enhance the secrecy level of wireless systems through the use of a jamming technique that uses uncorrelated reciprocal channel estimations from the legitimate channel as a common random source to select discrete jamming signals in both sides of the legitimate link. After that selection, these jamming signals are combined with data at the legitimate transmitter,...
Power delivery from an external source to implanted devices through wireless links is hindered by SAR regulations, which limit the amount of power radiated by an external source that reaches an implant. In order to increase the power delivered to the implant, we studied a solution with two transmitters and compared results with the common single transmitter link. HFSS and COMSOL have been used to...
In this paper, we consider a MIMO system with two transmit ports and receiver ports in the power-line communications (PLC), and we propose two space time block codes (STBCs) Finite Feedback Schemes (FFSs) for PLC. In each scheme, the transmitter equips with two STBCs, one corresponding to each of the feedback values, to encode the information bits. Because of the impulsive noise in PLC channels, the...
This paper reports on the development and experimental characterization of a high data-rate communication link at 240GHz with highly-integrated direct-conversion quadrature transmitter and receiver modules implemented in 130nm SiGe HBT technology with ft/fmax of 350/550 GHz. Both modules employ a low-cost chip-on-board packaging scheme with single-chip TX and RX front-end circuits accommodating wideband...
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