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Cognitive radio is a means to solve the spectrum scarcity problem by allowing secondary spectrum users to share channels with the primary spectrum users in an opportunistic fashion. However, cognitive radio requires high costs in terms of spectrum sensing and monitoring system complexities as well as potential interference issues to the primary spectrum users. This paper proposes a spatial spectrum reuse scheme that arranges the deployments of secondary users far away from primary users so that the coexisting wireless systems on the same spectrum band cause negligible interferences to each other. The scheme exploits the spectrum utilization characteristics of both worlds, thus eliminates the spectrum sensing or monitoring complexities.
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