The WiMedia Alliance has proposed an UWB OFDM system with data rates from 53.3 to 480Mbps operating in the 3.1 to 10.6GHz band [1]. These data rates are comparable to wired specifications, such as USB 2.0, enabling many applications developed for wired platforms to migrate to this wireless technology. However, many of these products require compact and low-cost hardware platforms. Therefore, highly integrated all-CMOS SoCs may offer competitive advantages for UWB applications when compared with other less integrated approaches. We present an integrated RF transceiver and digital PHY on a single CMOS chip that includes all the active circuitry required for operation in Band Group #1 (3.1 to 4.8GHz), and supports both fixed-frequency and frequency-hopping modes in 528MHz bands.
In this study, a dual-port wind-energy conversion system has been proposed. A double-fed permanentmagnet synchronous generator (DFPMSG) forms the central part of the system, where the concentrated single-layer winding configuration of the generator enables electric and magnetic isolation between the ports. DFPMSG has two three-phase terminals out of the stator; one is connected directly to the grid, whereas the other is tied to the grid through a back-to-back converter. This study investigates design issues caused by the DFPMSG port with a direct grid connection. The unique design issues of the proposed system include determining the slot/pole combination using wind data and determining the minimum reactive power requirement for the port with a direct grid connection. Next, the load-sharing capability among the ports of the proposed system is presented through a detailed investigation of three schemes. Experimental work is presented for a 5-kW prototype DFPMSG system to illustrate the isolation among the ports, minimized reactive power demand on the port with direct grid connection, and load-sharing ability among the ports for different control schemes.INDEX TERMS Double-fed machines, electric machine design, multi-port systems, permanent magnet synchronous generators, wind energy.
Diabetes is a widespread and serious disease and noninvasive measurement has been in high demand. To address this problem, a power spectral density-based method was offered for determining glucose sensitive sub-bands in the nearinfrared (NIR) spectrum. The experiments were conducted using phantoms of different optical properties in-vitro conditions. The optical bands 1200–1300[Formula: see text]nm and 2100–2200[Formula: see text]nm were found feasible for measuring blood glucose. After that, a photoplethysmography (PPG)-based low cost and portable optical system was designed. It has six different NIR wavelength LEDs for illumination and an InGaAs photodiode for detection. Optical density values were calculated through the system and used as independent variables for multiple linear regression analysis. The results of blood glucose levels for 24 known healthy subjects showed that the optical system prediction was nearly 80% in the A zone and 20% in the B zone according to the Clarke Error Grid analysis. It was shown that a promising easy-use, continuous, and compact optical system had been designed.
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