Soongsil University

Kwang-Yul Kim

Seung-Woo Lee

Yoan Shin

Yo An Shin

Honggyu Jung

The present invention relates to a test node-based wireless positioning method and a device thereof, the method comprising the steps of mapping and storing the number and position coordinates of anchor nodes, which are within a set distance from a test node, for each of a plurality of test nodes set at uniform intervals in a space formed by a plurality of anchor nodes; acquiring each position coordinate of the anchor nodes, which are within the set distance from a unknown node to be positioned; comparing each of the acquired position coordinates of the anchor nodes and the position coordinates of the anchor node mapped on the test nodes, so as to select the test nodes of which the number of position coordinates coinciding with the anchor nodes greater than a threshold; and estimating the position of the unknown node by using the position coordinates of the selected test nodes.

Test node-based wireless positioning method and device thereof

Disclosed is a cooperative spectrum sensing system using sub-Nyquist sampling, which include: a plurality of secondary user terminals for detecting a frequency band occupied by a primary user terminal; and a fusion center, wherein each of the secondary user terminals may include: a receiving unit for receiving signals from the primary user terminal; a sampling unit for performing the sub-Nyquist sampling for the received signals at a predetermined down-sampling rate; an energy-detecting unit for detecting the frequency band occupied by the primary user terminal by detecting energy for the sampled signals; and a calculating unit for calculating a correct detection probability and a false alarm probability for the frequency band occupied by the primary user terminal by using spectrum of the frequency band, and for transmitting results of calculation to the fusion center.

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Seoul, South Korea

Kwang-Yul Kim