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A new direct conversion architecture design of a multi-standard transmitter supporting cellular standards (GSM, UMTS and Wimax), wireless personal and local area network standards (Bluetooth, Zigbee and IEE802.11 b/g) as well as Radio navigation standards (GPS, Galileo) is presented in this paper dedicated for rescue applications. Behind this high number of standards, the proposed optimization design...
Rapid developments and emergence of diverse wireless systems call for radio frontends with agile and multistandard properties. Within this publication the performance of a direct RF digitizing ΣΔ-modulator based analog-to-digital converter (ADC) is evaluated based on orthogonal frequency division multiplex (OFDM) system simulation on the bitstream layer. The necessary transmit and receive building...
This invited paper exposes our latest developments in the field of digital transmitters by focusing on digital and mixed-signal processing blocks, such as delta-sigma modulators, high-speed interpolation filters and digital-to-RF converters. The goal is to demonstrate that radio-frequency signal generation by mostly-digital means is competitive and not so far from being a realistic option. It will...
Ever since the beginning of using radio frequencies, a debate started to raise on their safety, after a number of studies, the International Commission on Non-Ionizing Radiation (ICNIRP) came up with standards claimed to be safe to operate within. In this paper, we are mainly concerned with studying the main sources of EMF radiation at the vicinity of the university and then to check if the combined...
Soldiers today are constantly exposed to radio frequency (RF) energy, whether deployed in peace or in active operations. The intensity of radiation to which a soldier is subjected has witnessed a phenomenal increase with advent of high power radio transmitters, radars, jammers and other non communication equipment. This is further compounded by increased density of emitters in battlefield. While a...
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