Patent ID: 8787927
Filing Date: 2014-07-22
Classification: H04B,H04W

Abstract:
1. Apparatus for frequency-selective occupancy detection of a channel in a frequency band, comprising: a detector for detecting a power spectrum density PSD in the frequency band; a provider for providing node frequencies for a threshold curve with respect to a noise floor in the frequency band; a determiner for determining node power levels at the node frequencies based on receive power levels of the power spectrum density, wherein the determiner for determining node power levels is implemented to integrate a previously determined node power level into the determination of a node power level currently to be determined such that heavily varying node power levels are attenuated; a determiner for determining the threshold curve in the frequency band based on the provided node frequencies and on the node power levels at the node frequencies; and a comparer for comparing a current power of the receive power levels in the channel with a reference power in the channel predetermined by the threshold curve, for determining, in dependence on the comparison, an occupancy or non-occupancy of the channel.