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Response delay problem and measurements of such delays have been reported in Part I. The response delay has a negative impact on the accuracy of spectrum sensing, which is the cornerstone of cognitive radio. In this paper, single-user prediction of channel state is proposed to minimize the negative impact of response delays caused by hardware platforms. Specifically, a modified hidden Markov model...
As part of the effort toward building a cognitive radio (CR) network testbed, we have demonstrated real-time spectrum sensing. Spectrum sensing is the cornerstone of CR. However, current hardware platforms for CR introduce time delays that undermine the accuracy of spectrum sensing. The time delay named response delay incurred by hardware and software can be measured at two antennas colocated at a...
The prerequisite of accessing white spectrum is to find and locate it. Our work deals with spectrum detection and recognition under the umbrella of cognitive radio. In the procedure of spectrum recognition, a frequency sweeping device sweeps the wideband spectrum and the samples of the wideband power spectrum density (PSD) are fed into different hidden Markov models (HMMs) sequentially. The core idea...
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