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Restrictions on adjacent channel interference leave large swath of spectrum unused. According to FCC, the adjacent channels of an active TV channel are excluded from unlicensed usage. This protection is crucial when estimating the amount of available TV whitespace. By its nature this limitation is technical. Strict primary user protection requirements render most of these adjacent channels unavailable...
The requirement for secondary spectrum usage is the control of secondary generated interference to the primary system. The generated interference from different types of secondary networks can be controlled by adjusting different parameters. The carrier sensing threshold can be used as a common parameter to control the density of active secondary users in wireless networks with contention control...
Cognitive radio aims to increase spectral efficiency by exploiting information about the environment and activity of other transmitters. It allows access to temporary and/or spatially unused TV spectrum, white space, or overlay on the TV transmission. In this paper we consider an overlay cognitive radio in DVB-T coverage area, TV black space. We analyze the performance of a simple sequential interference...
The main requirement for secondary operation over the TV white spaces is interference control. In this paper, we propose an interference control scheme that allows multiple secondary systems to maintain their aggregate interference at the TV receivers under specific protection limits. The main characteristic of the proposed scheme is the small signaling overhead required for the cooperation between...
In US FCC and in Europe ECC have outlined the rules for TV-band secondary use. In this paper we apply those rules and compute how much white space is available in Finland. The results are expressed in terms of available secondary channels and secondary system capacity. As a secondary system we use cellular networks with different cell sizes. Unfortunately, the current secondary spectrum usage rules...
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