Electronics and Telecommunications Research Institute

Heon-Jin Hong

Chang-Joo Kim

Jong-Ho Kim

Hyuk Lim

Kyu-Min Kang

Hyunduk Kang

Sang-In Cho

Ho-Kyung Son

Daewon Jung

Young-Keun Yoon

Provided are a packet transmission scheduling method in a wireless network and a packet transmission method using the same. The packet transmission scheduling method, includes storing location information and a path loss exponent of each node on a multiplexing path; calculating a Signal-to-Interference and Noise Ratio (SINR) between nodes on a predetermined path based on the stored location information; when the calculated SINR exceeds a threshold, forming the paths as a path table; and scheduling packet transmission based on the formed path table.

Packet transmission scheduling method for simultaneous packet transmission in multiplexing paths in wireless network, and packet transmission method using the same

An apparatus for detecting a signal in a common frequency band includes: a signal processor configured to extract a selected band signal from received wireless signals by filtering the received wireless signal based on a frequency selection control signal, convert the extracted signal to a baseband signal, and detect a predetermined signal; a sensing signal determiner configured to determine existence of the signal, output a determination result, and outputs a frequency selection generating signal when the predetermined signal is absent; and a frequency selection controller configured to output the frequency selection control signal by selecting a target band among a plurality of previously decided bands.

Apparatus and method for detecting signal in common frequency band

A method for 3D preprocessing for ray tracing includes: selecting and storing visible surfaces by designating one of a plurality of structures as a reference structure and remaining structures as relative structures, searching for the relative structures from the reference structure, storing relative structures having a surface visible from the reference structure, and removing relative structures having an invisible surface; conducting selection and storage based on distance measurement by measuring the distance from the reference structure to each of the stored relative structures and removing relative structures positioned beyond a reference spot predetermined with reference to the reference structure; and calculating a ray propagation path by calculating the propagation path of the ray between the reference structure and each of the relative structures stored in said conducting selection and storage based on distance measurement.

Method for 3D preprocessing for ray tracing

There is an apparatus for predicting wave propagation characteristic of a multiple antenna system, including: a transmission position calculator for calculating transmission positions of multiple transmitting antennas; a wave propagation path searcher for searching for a wave propagation path for each of a plurality of image antennas generated for each of said multiple transmitting antennas; a reflection electric field calculator for calculating a partial reflection electric field on the searched propagation path; and a received power calculator for calculating a received power based on the calculated partial reflection electric field.

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Daejon, South Korea

Heon-Jin Hong