Electronics and Telecommunications Research Institute

Jae-Hwui Bae

Soo-In Lee

Ju-Yeun Kim

Nam-Ho Hur

Hyun Jun Lee

Hyun Woo Lee

Sun-Hyoung Kwon

Chie Teuk Ahn

Soo In Lee

Heung Mook Kim

Dong-Joon Choi

Jae-Hyun Seo

Gwang Soon Lee

Jong Soo Lim

Young-Su Kim

Jong-Soo Lim

Seung-Won Kim

Young Su Kim

Jae Hyun Seo

Joung Il Yun

Kyu Tae Yang

Kwang-Yong Kim

Seomee Choi

Ju Yeun Kim

Disclosed herein are an apparatus and method for transmitting and receiving a 4-layer layered-division multiplexing (LDM) signal. An apparatus for transmitting a 4-layer layered-division multiplexing signal includes a layered-division multiplexing modulation unit for generating a 3-layer layered-division multiplexing signal by performing layered-division multiplexing modulation on three layer signals and generating a 4-layer layered-division multiplexing signal by inserting a Pseudo-random Noise (PN) sequence into the 3-layer layered-division multiplexing signal, a pilot insertion unit for inserting a pilot into the 4-layer layered-division multiplexing signal, and a transmission unit for transmitting the 4-layer layered-division multiplexing signal.

Apparatus and method for transmitting and receiving 4-layer layered-division multiplexing signal

Disclosed herein is a demodulation method of a Layer-Division Multiplexing (LDM) system. The demodulation method may include receiving an LDM modulation signal, restoring a first-layer signal from the LDM modulation signal and remodulating the first-layer signal, restoring and remodulating a second-layer signal by performing cancellation of the amplitude component of the first-layer signal from the LDM modulation signal using signaling information independently of restoration and remodulation of the first-layer signal, and restoring a third-layer signal using the first-layer signal, the second-layer signal, and the LDM modulation signal.

Modulation and demodulation method in layer-division multiplexing system, and receiver thereof

Provided are an apparatus and method for selecting an optimal signal using auxiliary equalization in a diversity receiver. The optimal signal selecting apparatus includes: a plurality of sync recovery units for extracting sync information from baseband signals, which are candidate signals, except a baseband signal selected as a current optimal signal a plurality of auxiliary equalizers for channel-equalizing the candidate signals based on the extracted sync information; a plurality of SNR measuring units for measuring signal-to-noise ratios (SNRs) of the candidate signals inputted to the auxiliary equalizers and the candidates signals equalized in the auxiliary equalizers; and an optimal signal selector for selecting an optimal candidate signal from the candidate signals by using the extracted sync information and the measured SNRs, and replacing the optimal signal with the optimal candidate signal when reception quality of the current optimal signal is poor.

Apparatus and method for selecting optimal signal using auxiliary equalization in diversity receiver

Provided are a beam combining and hybrid beam selection method that can improve digital broadcasting reception performance by combining more than two beam output signals (beam combination type) instead of simply selecting one of beam output signals (beam selection type), or even selecting an optimal method between the beam selection type and the beam combination type, and a digital broadcasting receiving apparatus using the same.

Beam combining and hybrid beam selection method for improving digital broadcasting reception performance, and digital broadcasting receiving apparatus using the same

There are provided a method for selecting an optimal beam to improve digital broadcasting receiving performance, and a digital broadcasting receiving apparatus using the same. The method includes the steps of: a) calculating a mainpath Signal to Multipath signal and Noise Ratio (SMNR) based on a channel impulse response for a plurality of beams which are formed according to steering directions from output signals of antennas, wherein the output signal of each antenna has different phase shift according to location of antenna element; b) selecting a predetermined number of beams having a high SMNR value by comparing the calculated SMNR value for respective beam; c) calculating a mainpath Signal to Dominant Multipath signal Ratio (SDMR) based on a channel impulse response corresponding to the selected beam; and d) selecting a beam output signal having the biggest SDMR value by comparing SDMR values calculated in selecting a predetermined number of beams.

Method for selecting optimal beam and apparatus for receiving digital broadcasting signal using the same

There is provided to an apparatus and method for selecting a beam having an optimal channel characteristic among multiple beams, which are formed at a digital TV receiver employing a switched beamforming part. The beam selecting apparatus of the digital TV receiver having a switched beamformer and a channel equalize includes: a correlating unit for calculating cross-correlation values with respect to previous known Field Sync signals and Field Sync signals of beams having energy larger than a predefined value among beams outputted from the switched beamformer; a channel profile extracting unit for extracting multi-path channel profiles of the beams by using the cross-correlation values; an effective signal path searching unit for obtaining the number of effective signal paths having values larger than a predefined threshold based on the channel profiles; and a beam selecting unit for selecting beams of a channel profile having the smallest number of the effective signal paths among the beams outputted from the switched beamforming means as an input beam of the channel equalizer.

Apparatus and method for selecting optimal beam for digital TV receiver

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Daejeon, South Korea

Jae-Hwui Bae