Exploiting Temporal Secondary Access Opportunities in Radar Spectrum
In this paper, we quantify the temporal opportunities for secondary access to radar spectrum. Secondary users are assumed to be WLANs which opportunistically share the radar frequency band under the constraint that the aggregate interference does not harm radar operation. Each WLAN device employs dynamic frequency selection (DFS) as a mechanism to protect the radar from the interference. We also consider an advanced interference protection mechanism, which is termed temporal DFS. It exploits the temporal variation of interference power due to the periodic rotation of radar antenna. It is observed that the probability of accessing the radar spectrum is significantly higher when the temporal DFS is used compared to the conventional DFS. As a consequence, more WLANs can utilize the radar spectrum when the temporal DFS mechanism is considered. This shows that having better knowledge of the primary user activity can bring about the increased opportunity of secondary spectrum access to radar band, and thus improve the spectrum utilization.
KeywordsSecondary spectrum access Radar spectrum Aggregate interference Dynamic frequency selection Temporal opportunity
The research leading to these results has received partial funding from the European Union’s Seventh Framework Programme FP7/2007-2013 under grant agreement 248303 (QUASAR). The authors also would like to acknowledge the VINNOVA project MODyS for providing partial funding.
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