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In this paper, we consider spectrum sensing in a new cognitive radio (CR) scenario where the primary user (PU) could possibly transmit with multiple power levels and where the noise power at the secondary user (SU) side is uncertain. The target for the SU is not only to detect the presence of PU, as in the conventional “on–off” CR scenario, but to identify the PU's transmitting power level as well...
In this paper, a new design of the robust adpti-ve beamformer (RAB) is developed to overcome the increased computation cost of the traditional RABs. This approach introduces a suboptimal of the distance between the actual array steering vector (ASV) and presumed ASV in tandem with the iterative doubly constrained robust capon beamformer using fixed uncertainty level (Fu-IDCRCB). Then, the uncertainty...
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