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Spectrum access approach and power allocation scheme are important techniques in cognitive radio (CR) system, which not only affect communication performance of CR user (secondary user, SU) but also play decisive role for protection of primary user (PU). In this study, we propose a power allocation scheme for SU based on the status sensing of PU in a single-input single-output (SISO) CR network. Instead...
In this paper, we describe the dynamic model of a four-rotor mini rotorcraft, and present the hardware design of real-time embedded control system for small Unmanned Aerial Vehicles (SUAV). We improve the driver performance for Brushless Direct Current (BLDC) motor. In addition, the modular programming method is adopted in software design to carry out the computation of control law, data processing...
Multiantenna wireless systems have been well studied in achieving high data rates. In this paper, we improve a subspace-based blind channel estimation technique for multi- input multi-output (MIMO) orthogonal frequency-division multiplexing (OFDM) approach based on tracking the subspace recursively. The recursive subspace algorithm has a computational complexity of O(J2) , where the J is the input...
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