Abstract
The article analyses the role of Multiple Input - Multiple Output (MIMO) and Opportunity Spectrum Access (OSA) technologies in future Cognitive Radio (CR). The model of two networks operating in the same frequency band under Rayleigh fading conditions is studied in detail. The network of licensed users called the primary operates in SISO mode, while the secondary one - in MIMO mode. The results of the analysis are encouraging. For the future it is proposed that the networks should be equipped with a dense grid of spectrum sensing detectors and OSA-routers.
Highlights
Since its appearance the Opportunity Spectrum Access (OSA)-MIMO idea has been struggling with a severe shortage of the EM spectrum and its wasteful exploitation by the licensed owners
If we assume that primary users operate in a conventional SISO mode, while the secondary users in MIMO mode, the deficit of spectrum can be diametrically improved
The results show that MIMO applied in both networks, P and S, brings the small capacity CS in the secondary network
Summary
Since its appearance the OSA-MIMO idea has been struggling with a severe shortage of the EM spectrum and its wasteful exploitation by the licensed owners. Due to the original Mitola's idea [1], the secondary users (SU) can transmit only, if the primary users (PU) are inactive The only condition is that the secondary transmitter (ST) keeps its interfere power below the predefined threshold at each primary receiver (PR) [3] This requires delimitation of the power allocation schemes, Fig.. If we assume that primary users operate in a conventional SISO mode, while the secondary users in MIMO mode, the deficit of spectrum can be diametrically improved. This is because MIMO technology offers the new space channels.
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