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Spectrum sensing is a key component of cognitive radio (CR) system to understand its radio frequency (RF) environment. One critical challenge in spectrum sensing is detection of weak signals in particular in an indoor environment. Distributed spectrum sensing can address this shortcoming by providing a combined data from spatially distributed sensors. This approach often achieves higher sensitivity...
This paper introduces recent R&D on distributed spectrum sensing, the use cases for distributed sensing approach and the need of exchanging sensing related information among different devices in a cognitive radio system for dynamic spectrum access. This paper also shows the latest standardization activities on the interface for sensing information exchange between the sensors and their clients.
In this paper, we propose an adaptive-power-control scheme for a cognitive radio system (CRS) in a Rayleigh fading channel. By allowing transmit power adaptation at the secondary user (SU) transmitter to maintain a constant output SNR to the SU receiver, this scheme maximizes the output SNR and limits the interference to a primary user (PU) within an interference constraint. To calculate this maximum...
An adaptive power control scheme for cognitive radio system (CRS) in Rayleigh fading channel is proposed. The transmit power of a secondary user (SU) is adjusted in Rayleigh fading to maximize the constant output signal-to-noise ratio (SNR) at an SU receiver while keeping the interference to a primary user (PU) under given constraints. To calculate the maximum constant output SNR at the SU receiver...
AbstraAbThis study addresses detection of primary users (PUs) for cognitive radio system (CRS) with distributed spectrum sensors (DSSs) in Rayleigh fading environment. Two sensing schemes using DSSs that employ energy detection (ED) are investigated as cooperative sensing and collaborative sensing. For the cooperative sensing, each DSS makes hard decision after sensing and transmits the information...
This paper introduces two cognitive radio (CR) systems: (a) heterogeneous type CR and (b) spectrum sharing type CR regarding its definition, usage model, fundamental system architecture, and developed prototype.
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