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Ultra-Wideband (UWB) is a promising technology for short range wireless communication and precise ranging. In this paper, we first briefly review different approaches of UWB technique, and then concentrate on impulse radios. Various impulse UWB transceiver circuits and systems for different applications such as WPAN, WSN and WBAN are presented. Some recently developed pulse-based UWB radios are also...
This paper presents a three-level three-phase neutral-point-clamped back-to-back converter applied to a wind emulator, where a wind power generator is connected to the grid through the back-to-back converter. The converter regulates the power extracted from the generator and controls how this power is injected to the grid with the desired power factor. Two phase locked loops are in charge of synchronizing...
This work presents a new architecture of spread-spectrum clock generator providing 1.5-Gbit/s, 3-Gbit/s and 6-Gibt/s SATA compatible specifications. A two-stage delta-sigma modulator is proposed to simplify the hardware and to overcome the nonlinearity issue of triangular control voltage induced by supply voltage, process and temperature variations. The peak energy of the output clock spectrum is...
Wireless personal area networks (WPAN) systems for the communication in the indoor environment have been developed according to the growth of the ubiquitous technology. IEEE 802.15.4a is a standard which describes the indoor communication systems for the ultra-low complexity and power consumption. Implementation of PHY for IEEE 802.15.4a employs ultra-wide band (UWB) technologies which have the advantage...
Class D amplifiers are becoming the most feasible solution for embedded audio application. However, distortions due to the non-linear nature of switching stage are the main drawback for this amplifier topology. This paper discusses the design and implementation of high fidelity audio class D using sliding mode control scheme. This design method proves to be a cost effective solution for industrial...
Testing distributed arrangements of protective devices often requires distributed test equipment for comprehensive assessment. The test units need to be synchronized in order to provide properly interpretable signals to the devices under test. While there are diverse ways to achieve this goal, one efficient way is to make use of IRIG-B signals that are available on site, e.g. for time logging purposes...
Li and Xia have recently investigated the design of space-time codes that achieve full spatial diversity for asynchronous cooperative communications. They show that certain of the binary space-time trellis codes derived from the Hammons-El Gamal stacking construction are delay tolerant and can be used in the multilevel code constructions by Lu and Kumar to produce delay tolerant space-time codes for...
We designed and built a novel all-optical re-timing, re-amplifying, and re-shaping (3R) regeneration system based on terahertz optical asymmetric demultiplexers (TOADs) developed in our laboratory. The system is capable of parallel processing multiple wavelengths, a feature which will significantly improve the scalability of current wavelength division multiplexing (WDM) networks. Performance against...
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