Korea Electronics Technology Institute

Jung Wook Wee

Dong Sun Kim

Won Gi Jeon

Jeong Wook Seo

Ki Won Kwon

Kyung Won Park

Youn Sung Lee

Jong Ho Paik

Seul Ki Song

Byoung Chul Song

Provided is a method of providing a plurality of images on the basis of meta information about a free viewpoint relation. In this case, the plurality of images includes a reference image and a surrounding image. Accordingly, a user at a remote site may view one piece of content at various viewpoints and the accessibility and convenience of use may be improved.

Method and apparatus for providing free viewpoint video

A method for transmitting device indicator data in a network-based AV system is provided. The method for transmitting the device indicator data records device indicator data on a data unit which is used in an AV transmission protocol, and transmits the data unit. Accordingly, the indicator data which changes in real time in a network AV device can be rapidly transmitted to a management platform.

Method for transmitting device indicator data in network-based AV system

Disclosed herein is a hybrid channel estimation method and system for an Orthogonal Frequency Division Multiplexing (OFDM) wireless communication system. The hybrid channel estimation method includes the steps of acquiring a first channel coefficient using decision-directed channel estimation; acquiring a second channel coefficient using pilot-symbol-aided channel estimation; and calculating the final channel coefficient of a received signal by multiplying the first and second coefficients by first and second multiplication coefficients, respectively, and adding the multiplication results. The step of acquiring the first channel coefficient using the decision-directed channel estimation includes the steps of acquiring an initial channel coefficient by processing a long training symbol using a Least Square (LS) method; generating data by equalizing, demodulating and modulating a fast Fourier transformed new symbol using a previously estimated channel coefficient; and acquiring a new channel coefficient by dividing the new symbol by the data.

Hybrid type channel estimation method and system for mobile environment

The present invention relates to a method and apparatus for detecting STBC-OFDM signals in time-variant channels. The method includes a step of demodulating STBC-OFDM modulation signals into OFDM reception symbols using Fast Fourier Transform (FFT); a step of estimating a frequency response for each sub-channel; an STBC decoding step of calculating decision variables determining the A transmit data symbols that are transmitted during the B OFDM symbol periods for each sub-channel; and a step of determining the transmit data symbols based on the decision variables calculated at the STBC decoding step. In this case, the decision variables are calculated using a linear equation that allows a squared Euclidean distance from OFDM reception symbols, which are demodulated during the B symbol periods, to have a local minimum for each decision variable when the STBC encoding and the frequency responses estimated during the B OFDM symbol periods are applied.

Method and apparatus for detecting STBC-OFDM signals in time-variant channels

Disclosed herein is a method for eliminating the reception interference signal of a Space-Time Block Coded Orthogonal Frequency-Division Multiplexing (STBC-OFDM) system in a high-speed mobile channel. The method includes the following steps. At the first step, the gain of a channel combined at a receiving end is estimated in the case of using the STBC-OFDM system on a time-varying channel. At the second step, first temporary decision symbols are obtained by performing comparison on the estimated gain. At the third step, second temporary decision symbols are obtained using the first temporary decision symbols. At the fourth step, self-channel interference (SCI) terms are eliminated using the second temporary decision symbols and third temporary decision symbols are obtained. At the fifth step, final data symbols are obtained using the third temporary decision symbols.

Method for eliminating reception interference signal of space-time block coded orthogonal frequency division-multiplexing system in high-speed mobile channel

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Namyangju, South Korea

Jung Wook Wee