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A novel multiuser dynamic radio resource allocation scheme for spectral efficiency optimization in a cognitive ultra wideband radio system is presented in this paper. A new expression of computing the interference power to the primary users over the UWB multipath channel is derived in this work based on the Fenton-Wilkinson method. The subcarriers of the UWB system are grouped into subcarrier blocks...
In this paper, we propose a cognitive radio-based multi-user resource allocation framework for mobile ad hoc networks using multi-carrier DS CDMA modulation over a frequency-selective fading channel. In particular, given pre-existing communications in the spectrum where the system is operating, in addition to potential narrow-band interference, a channel sensing and estimation mechanism is provided...
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