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An important parameter in determining a spectrum sharing opportunity is the level of interference power that secondary users may generate towards primary users. It is indicated in literature that the aggregate interference power of an infinite network (such as a very large secondary network) is bounded under certain conditions. However, to the best of the knowledge, no work has been devoted to determining the boundary of the dominantly interfering region. In this paper, the authors identify the smallest portion (dominant region) of the secondary network that would impact spectrum sharing opportunities. The results show that the dominant region is not necessarily a small region encompassing a few interferers within the proximity of the primary user.
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