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A concurrent, tunable, tri-band, single chain radio receiver for 5G radio access networks is evaluated. The three concurrent bands are independently tunable over a frequency range from 600 MHz to 2.7 GHz. A hardware-in-the-loop test-bed provides a system level evaluation of the proposed receiver using direct RF digitization. The test-bed emulates a 5G heterogeneous network supporting three wideband,...
This invited paper considers a key next step in the design of radio architectures aimed at supporting low energy consumption in 5G heterogeneous radio access networks. State-of-the-art mobile radios usually require one RF transceiver per standard, each working separately at any given time. Software defined radios, while spanning a wide range of standards and frequency bands, also work separately at...
In order to meet the high data rate, low latency and high energy efficiency requirements, the future radio units must utilise the frequency spectrum available at certain geographical location efficiently with a minimum amount of hardware. This requires frequency agility and concurrent multi-standard operation capabilities at the base and mobile terminals. To utilise the TV white spaces for mobile...
This paper considers the problem of parameter tracking in wireless sensor networks. The sensor nodes observe a random vector source that varies according to a state-space model, and perform linear precoding on the observations, before coherently transmitting them to the fusion center. The fusion center then linearly decodes the received vector in order to recover the source vector. Compared to the...
The Ion Cyclotron Heating and Current Drive (IC H & CD) system for ITER will provide Radio frequency (RF) heating and current drive to the ITER plasma. This system is designed to provide 20 MW into the plasma using frequencies in the range of 40 MHz to 55 MHz, which could be upgraded to 40 MW in future. This paper presents the recent development of the IC H&CD system configuration in the ITER...
The ion cyclotron resonance frequency (ICRF) system is one of the most important ITER heating and current drive systems. Total 20 MW of RF power is required to be dumped on the ITER plasma using 8 nos. of RF sources, each capable of delivering 2.5 MW at VSWR 2 in the frequency range 35 - 65 MHz. RF power to the antenna should remain constant to its required value, even if source experiences VSWR of...
Directional couplers are used to monitor forward and reflected high RF powers. At Mega Hertz range of frequencies, normally loop type directional couplers are used. The loop samples electric or magnetic fields. The penetration and orientation of the loops are adjusted in such a way that the magnitude of electric and magnetic current is same in the two arms of the loop. In this configuration one arm...
The design of a 2.45-GHz near-field RF identification (RFID) system with passive on-chip antenna (OCA) tags is very challenging as the efficiency of RF power conversion is very low. It poses multidisciplinary research challenges such as ultra-low-power circuits design, semiconductor process technology, and integrated antenna design. This paper describes the designs of such an RFID system, the reader,...
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