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xDSL을 위한 오류 제어 시스템 모델링 및 성능평가에 관한 연구
권호열,전진화 강원대학교 정보통신연구소 1999 정보통신논문지 Vol.3 No.-
In the xDSL channel of the twisted pair line, there are long burst errors because of impulse noise such as NEXT(Near end crosstalk), RFI(Radio frequency interference). So if only error control code were used for burst error correction, error control system is very complex. Therefore if an interleaver that distributes burst errors to a few codewords were used with error control code, a total error control system performance is promoted. In this paper, Reed-Solomon code used for correcting these burst errors, and scrambler, sequential interleaver. The channel loss is impulse noise tested for the ANSI T1E1.4. And a total system is simulated at the matlab communication and simulink toolbox. An analysis evaluation is acquired to error rate of the error correct system, and delay time of the interleaver, interleaver efficience.
최성환,전진화,권호열 강원대학교 정보통신연구소 1999 정보통신논문지 Vol.3 No.-
In this paper, we evaluate transmission channel characteristics of telephone cable to be used in general. First, we measured the impedances of open and short circuits in order to obtain the RLCG parameters per unit length of transmission line. And we obtained the frequency-dependent transfer function and propagation constant for transmission line using these values. The channel impulse response is derived from the inverse Fourier of transfer function. We design channel equalizer for ADSL(Asymmetrical Digital Subscriber Line) using the measured impulse response of channel. The results shows that the transfer characteristics decrease sharply according to the length of transmission line. Finally, we verify efficacy of the proposed method by means of simulation.
권호열,전진화,김범규 강원대학교 정보통신연구소 1998 정보통신논문지 Vol.2 No.-
Carrierless Amplitude Modulation/Phase Modulation(CAP) has the same spectral characteristics and provides the same theoretical performance as QAM, but is generally less complex to implement digitally. In this paper, a 52 Mbps CAP transceiver system is modeled and simulated according to DAVIC VDSL standard. Also we analyzed error rate characteristics under AWGN channel by using MATLAB.