In this paper, we describe a software defined radio (SDR) platform that can be used to implement the IEEE 802.15.4g standard for low data rate wireless smart utility networks (SUN). The SUN standard supports multiple wireless band plans, defines multiple physical (PHY) layers: FSK, OFDM and O-QPSK, each supporting a large number of data rates. Because of the flexibility allowed in the standards, an SDR approach provides the greatest flexibility in implementing the standard. We propose to use the SDR platform based on Texas Instruments C28x 32-bit MCU platform and a sub-1GHz CC1260 low power integrated radio. This platform may be used for both the smart e-meter as well as the data concentrator. We begin the paper by providing an overview of the different PHY layers and enumerating the common elements across all PHYs for both the transmitter and receiver. Next, we discuss a partitioning between software and hardware that provides the flexibility without sacrificing efficiency. Finally, we provide the details of a hardware accelerator incorporated into the C28x architecture (VCU II) that can simplify many of the complex tasks associated with these PHYs.
Study for centering electron beam in Beam Based Alignment (BBA) method through quadrupole magnets is performed in the 2.5 GeV Synchrotron Radiation Source (SRS), Indus-2, at RRCAT. Each group of the series connected quadrupole magnets is powered by a precision current source (I M ). To perform BBA, the magnetic field of each quadrupole magnet has independently been varied by a few percent of I M , through putting an active shunt across it.A prototype active shunt has been designed and developed for this purpose. The active shunt prototype was tested for its full load sinking and sourcing capacity of 6 A current at ±80 V. It was also tested during machine operation by connecting to a group of quadrupole magnets. The Performance of the shunt in terms of load current stability, sensitivity to disturbance, ripple, powerfactor, line harmonics and power converter efficiency was evaluated during the testing.Pulse Width Modulated Rectifier (PWMR) is used as the input stage of the shunt, which is also helpful in achieving lower line current harmonic distortion and maintaining input power factor to unity over-wide operating current range. This regenerative utility interface has aided efficient four quadrant operation of the shunt.
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