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Internet of Things (IoT) is a topic of growing interest and intensive research in industry, technological centers and academy, where data communication is one of its most relevant aspects. Since IoT is an open field for new applications, it does not have yet a standard communication protocol. This paper presents the system level design of a WiFi receiver supporting the novel low power standard IEEE...
The LoRa technology has emerged as an interesting solution for low power, long range loT applications by proposing multiple “degrees of freedom” at the physical layer. This flexibility provides either a long range at the cost of a lower data rate or higher throughput at the cost of low sensitivity, so a shorter range. In this paper, we analyze the flexibility of LoRa and propose various strategies...
This paper reviews trends for ultra-low-power wireless transceiver system and integrated circuit design under the perspective of using cost-effective CMOS technology nodes. These efficient transceiver structures typically find application in devices such as fitness monitors and other wearable healthcare devices, Internet of Things (IoT) devices and generic sensor nodes. A brief overview of State-of-the-Art...
This paper proposes a method to detect photon counts from a commercial off-the-shelf SPAD array. Experiments show that using this method the sensitivity of a VLC receiver that incorporates this SPAD array approaches the limit set by Poisson noise.
This paper describes the proposed architecture and the analytical optimization of an ultra-low-power and high sensitivity Resonant Micromechanical Receiver (RMR) to be used in wake-up radios. The proposed radio frequency (RF) system is composed of three different stages: (1) a piezoelectric resonator that provides for passive voltage amplification, impedance matching, and high-Q filtering; (2) a MEMS...
This work presents an ultra-low power event driven wake-up receiver (WuRx) fabricated in a RF CMOS 130 nm process. The receiver consists of an off-chip lumped element matching network, an envelope detector, a decision circuit capable of detecting sub-mV baseband signal voltages and a clock source consuming 1.3 nW. This receiver has demonstrated a sensitivity of −72 dBm while consuming a total of 8...
Radio Astronomy Network and Geodesy for Development (RANGD) Project by National Astronomical Research Institute of Thailand (NARIT) has been approved for year 2017–2021 with human capacity building as the main objective. Among several skills-developing activities, 40-m and 13-m radio telescopes are to be constructed as future national facilities. Missions of RANGD project include research development...
A highly sensitive capacitive micromachined ultrasound transducer (CMUT) cell with an ultra-narrow gap was investigated. The electromechanical coupling coefficient (kT) as a figure of merit of sensitivity of ultrasound transducers was 0.67 in a 30-MHz CMUT cell with a 30-nm height vacuum gap and in 100-nm thick dielectric layers, and the coefficient was superior to that of piezoelectric transducers...
The use of high power jammers on vehicles for Improvised Explosive Device (IED) detonation prevention and strategic enemy communications jamming, allows for high levels of noise and interference to couple from the jamming systems to the co-located on-board communications radio receivers. The high levels of jammer noise desensitise communication receivers and render them less effective. The use of...
A 402–405 MHz MICS-band wake-up receiver is presented that achieves −63.8 dBm sensitivity at 4.5 nW. High sensitivity at 400 MHz is accomplished via an 18.5 dB passive voltage gain transformer filter loaded by a high input impedance (Rin > 30 kΩ), high scaling factor (kED > 300), 1.8 nW current re-use pseudo-balun envelope detector, while low power is achieved by operating all active circuits,...
This paper describes recent developments at JIVE and the European VLBI Network (EVN), aimed at fostering the seamless interaction of VLBI networks around the globe, and eventually the inclusion of the SKA and its precursors as VLBI elements.
Interplanetary Scintillation (IPS) of compact radio sources at meter to centimeter wavelengths is a useful ground-based method to investigate solar wind. There are 3 technical solutions for IPS observation. At present, each running IPS dedicated telescope represents a solution accordingly. In recent future, a new IPS telescope is proposed to build in China. Therefore, we combined advantages of single...
This paper presents an overview of the design considerations and challenges of event-driven wakeup receivers as well as an analysis of state-of-the-art (SOA) research. We consider advantages and disadvantages of the commonly utilized architectures in these systems as well as presenting big picture perspectives from an application standpoint. This paper focuses on event-driven scenarios where the activity...
This paper proposed a radiated two-stage based method for the Multiple Input Multiple Output (MIMO) system evaluations. By using the proposed method, not only the final throughput values, but also the antenna patterns, the antennas' envelope correlation coefficient, the antennas' imbalance and the radiated sensitivity of the MIMO device can be obtained over the air. Moreover, through these parameters,...
In this paper, the sensitivity of the optical receiver is revisited. An analytical expression that reveals the dependency of the sensitivity on both the data rate (fbit) and the bandwidth shrinkage factor (n) is derived. The proposed sensitivity model provides guidelines for selecting the front-end topology. Based on that model, a three-stage front-end is implemented in 65 nm CMOS technology and 18...
This work presents a 180-nm CMOS bandpass ΣΔ Analog-to-Digital Converter (ADC) developed to fulfill the specifications of a fully-integrated receiver for Magnetic Resonance Imaging (MRI). CMOS integration of a multichannel digital receiver would increase the quality of the image without the need of using many coaxial cables to connect the RF coils (located close to the patient) with the digitizing...
RF interference can be a significant problem in modern day electronic devices. We present a workflow for the simulation of RF interference using a combination of 3D full-wave simulation and a system-level approach. This methodology helps reveal the transmitter and receiver combinations that are potentially prone to interference. The utilization of time domain results generated from SPICE-type circuit...
This paper describes a method to increase the sensitivity of a digital radio receiver based on the time synchronous averaging (TSA). The data to be send are grouped into a block and the block is retransmitted multiple times. Received blocks are synchronously averaged thus increasing the signal-to-noise ratio. The TSA can be performed on the analog signal at the demodulator output (soft TSA) or on...
This paper proposes an improved method for DBN, by means of introducing the detachment rate. The introduction of detachment rate can play a similar average role, and can make the complex relationship between the neurons weakened, so that DBN learning has stronger robustness. Three kinds of data (corresponding to healthy, faulted and deteriorating) were classified by the improved depth belief network...
We propose a novel carrier phase estimation method for the high-speed coherent WDM PON based on the reflective semiconductor optical amplifier (RSOA). By using this method, we can utilize a cost-effective DFB laser as the seed light in such a network due to its fast trackability. We experimentally achieve an excellent receiver sensitivity of −30.8 dBm even when a DFB laser (linewidth: 3 MHz) is used...
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