Electronics and Telecommunications Research Institute

Cheol Ho Shin

Sang Sung Choi

Kwang Roh Park

Byoung Hak Kim

Sung Woo Choi

Joon Hak Bang

Kwang Rho Park

Provided is a method for improving reliability of artificial intelligence-based object recognition, in which: in a server interworking with an artificial intelligence module, one or more object regions included in learning data including an image of a recognition target object to be recognized through the artificial intelligence module are recognized; object region recognition data which sets the recognized object regions is extracted and is provided to user terminals in a designated order; a procedure for receiving, from the user terminals, object region selection data which selects at least one effective object region corresponding to the recognition target object among object regions included in the object region recognition data is performed; and the object region selection data of respective users received from the user terminals is mutually compared and analyzed by the same object region selection data.

Method for improving reliability of artificial intelligence-based object recognition using collective intelligence-based mutual verification

A method and an apparatus for creating a frame of an orthogonal frequency division multiplexing (OFDM) specification using a frequency domain spreading (FDS). The method and the apparatus determine a number of padding bits based on various FDSs and a size of an interleaver and constitute a frame including a determined number of padding bits, so that there is provided a frame which is adequate for a data transmission rate using various FDSs and which includes a minimal number of redundant OFDM symbol.

Method and apparatus for creating frame of orthogonal frequency division multiplexing (OFDM) specification using frequency domain spreading

The present invention relates to an apparatus and a method for receiving signal for extent of timing synchronization in MB-OFDM UWB System. The invention divides the digital samples completed of sampling twice as much as minimum sampling clock required to restore the MB-OFDM received signal into ODD data path and EVEN data path, executes the packet detection and timing synchronization for each of divided path and selects the data of path with larger cross correlation value at the timing synchronization point to secure the stable receiving performance in system environment with severe frequency offset and prevent the FTT window shift within preamble section through adding minimum hardware and structural change without increasing the system clock.

Apparatus and method for receiving signal for extent limitation of timing synchronization in MB-OFDM UWB system

It is possible to intuitively determine whether to control transmission power of a current data transmission rate mode or to change the data transmission rate mode by extracting an automatic gain controller (AGC) index after driving algorithm of an AGC, recognizing a channel clear assessment (CCA) status by using the extracted AGC index, and generating link quality indicator (LQI) information to be transmitted from a physical layer to a media access control (MAC) layer by using the AGC index, when the CCA status is high, in order to embody effective piconets in a multi-band orthogonal frequency division multiplexing ultra-wide band system (MB-OFDM UWB system) including a receiver having a dynamic gain controller(DGC) and the AGC.

Method and apparatus for generating link quality indicator information in MB-OFDM UWB system

A frequency estimation method of multiband (MB)-orthogonal frequency division multiplexing (OFDM) ultra wide band (UWB) system using an Alt-PHY time frequency (TF) hopping strategy based on IEEE 802. 15. 3a. includes the steps of: a) selecting a predetermined number of frequencies among a plurality of center frequencies based on a predetermined number of OFDM symbols and estimating relative frequency offsets for selected frequencies; b) obtaining an average relative frequency offset by averaging the estimated relative frequency offsets when two or more frequencies are selected at the step a); and c) obtaining real frequency offsets for each of the center frequencies by transforming the obtained average relative frequency offset to the real frequency offsets and compensating a frequency offset caused by a transmitting/receiving local oscillators based on the obtained real frequency offsets.

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Daejeon, South Korea

Cheol Ho Shin