Collaborative compressed spectrum sensing: what if spectrum is not sparse?

摘要

The problem of detecting the failure of compressed spectrum sensing in wideband cognitive radio is considered. When the primary users occupy most sub-channels, the compressed spectrum reconstruction will fail owing to the non-sparsity of the spectrum. A Gaussian process (GP) framework is proposed to model the compressed spectrum reconstruction and exploit the correlation of model parameters to detect the failure of compressed reconstruction owing to nonsparse spectrum. The simulation results demonstrate that the proposed collaborative non-sparsity protection (CNSP) scheme can effectively identify the failure of spectrum sensing and avoid interference to primary users.