Abstract / truncated to 115 words (read the full abstract)

The demand for precious radio spectrum is continuously increasing while the available radio frequency resource has become scarce due to spectrum segmentation and the dedicated frequency allocation of standardized wireless systems. This scarcity has led to the concept of cognitive radio communication which comprises a variety of techniques capable of allowing the coexistence of licensed and unlicensed systems over the same spectrum. In this context, this thesis focuses on interweave and underlay cognitive radio paradigms which are widely considered as important enablers for realising cognitive radio technology. In the interweave paradigm, an unlicensed user explores the spectral holes by means of some spectrum awareness methods and utilizes the available spectral availabilities opportunistically while in the ... toggle 18 keywords

cognitive radio – interweave – underlay – satellite cognitive communications – hybrid satellite-terrestrial coexistence – interference modeling – interference alignment – spectrum sensing – eigenvalue based spectrum sensing – snr estimation – sparsity order estimation – compressive estimation – hybrid cognitive transceiver – full duplex cognitive radio – satellite communications – cognitive beamforming – cognitive beamhopping – inline interference mitigation. polarization based sensing

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