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In this paper, a reconfigurable cognitive radio receiver for autonomous spectrum sensing is presented. A reconfigurable antenna, low-noise amplifier, reconfigurable bandpass filter, single-ended balanced mixer, voltage-controlled oscillator (VCO), and variable gain amplifier (VGA) build up the chain of the proposed receiver. This receiver targets the WLAN IEEE 802.11WLAN IEEE 802.11 g commercial wireless...
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...
It is known that cognitive radio (CR) is an attractive concept to overcome the prevailing spectrum scarcity and inefficient spectrum usage. Also, with their intermittent spectral vacancies, TV white spaces offer a faster deployment potential considered with respect to cognitive radios. In this paper, system design of a high intermediate frequency (IF) to UHF frequency converter for cognitive radios...
The RF transceivers architectures are to integrate the concept of software radio. But, in the case of mobile terminal, hard constraints are imposed by the factor of mobility. Low power and very complex circuits are claimed by the telecommunication industry. Classical architectures are no more sufficient to challenge this goal. New systems are thus proposed, and the concept of software defined radio...
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