Electronics and Telecommunications Research Institute

Korea Telecommunication Authority

Seung Won Kim

Chieteuk Ahn

Yong Tae Lee

Jae Hyun Seo

Hyoung-Nam Kim

Jae Hwui Bae

Yoon C Park

The present invention relates to blind decision feedback equalization. The present invention selects one of a filter signal and a quantized signal as an input signal of a feedback filter in the DFE and update the tap coefficient according to the SAG flag f[k] by including a main filtering unit, a SAG flag determining unit and a blind feedback controlling unit. The present invention prevents decrement of a performance caused by an error propagation and also improve a convergence performance in an equalization apparatus and reduce a symbol error rate (SER) at a steady state after converging. In conclusion, the present invention can be used effectively to a receiver in a digital TV, which is required the blind equalizer.

Method and apparatus for blind decision feedback equalization

A receiver for improving reception ability of digital broadcasting service by switched beam-forming is disclosed. The receiver includes: an array antenna having a plurality of antenna elements for receiving signals of the digital broadcasting service; a demodulation unit for demodulating the receiving signals corresponding to each of antenna elements in the array antenna; beam-forming unit for generating a predetermined number of beam-forming signal by applying a beam-forming weights in order to direct to a predetermined direction according to the modulated signal from the modulation unit; and beam selection unit for selectively receiving signals of desired direction according to the beam forming signal. The present invention effectively eliminates multipath based on space filtering by utilizing beam-forming method with an array antenna for improving receiving performance of digital television broadcasting with VSB.

Digital broadcasting service receiver for improving reception ability by switched beam-forming

The present invention provides an apparatus and method for measuring two- dimensional displacement by moire fringes of concentric circle gratings which two-dimensional displacement can be precisely measured by a pair of grating and the measurement resolution can be improved by the image processing using the characteristics of moire fringes without noises.

Method and apparatus for measuring two dimensional plane displacement by

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Daejon, South Korea

Seung Won Kim