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구분 출원국
출원년도 ~ 키워드

상세정보

등록 직교주파수 분할 다중화 시스템을 위한 잔여 주파수 위상 시간 오차 및 크기 변화 추적 방식 및 그 장치

직교주파수 분할 다중화 시스템을 위한 잔여 주파수 위상 시간 오차 및 크기 변화 추적 방식 및 그 장치
이미지 확대
발명자
김명순, 이석규, 전태현, 유희정, 최은영, 류득수
출원번호
11286996 (2005.11.22)
공개번호
20060133527 (2006.06.22)
등록번호
7916797 (2011.03.29)
출원국
미국
협약과제
초록
An error tracking apparatus and method for tracking a residual frequency error, a phase error, a timing error, and a signal amplitude variation to enhance a phase error tracking performance and a tracking speed in an orthogonal frequency division multiplexing (OFDM) system is provided. The error tracking apparatus and method include: a frequency error corrector for correcting a frequency at a time domain by adding a tracking carrier error estimating value to an initial carrier frequency error estimating value; a signal amplitude tracking corrector for controlling a signal amplitude by multiplying an input signal converted by a fast Fourier transform (FFT) by an output value corresponding to a calculated power of a receive pilot signal; a channel corrector for outputting a channel correcting signal by multiplying the receive pilot signal by a complex conjugate of a frequency channel response of the receive pilot signal; a carrier frequency error estimator for estimating a carrier frequency error parameter using the channel-corrected pilot and providing the tracking carrier frequency error estimating value; a time offset estimator for estimating a time offset parameter using the channel-corrected pilot; and a carrier phase error estimator for estimating a carrier phase error parameter using the channel-corrected pilot.
KSP 제안 키워드
Amplitude Variation, Carrier frequency, Carrier phase, Complex conjugate, Error estimator, Error parameter, Error tracking, Fast Fourier, Fast Fourier transform, Fast fourier transform (fft), Frequency division, Frequency division multiplexing, Input signal, OFDM systems, Orthogonal frequency division Multiplexing(OFDM), Orthogonal frequency division multiplexing (OFDM) system, Pilot signal, Tracking Performance, Tracking speed, amplitude tracking, division multiplexing, fourier transform, frequency error(FE), phase error, signal amplitude, time offset, time-domain, timing error, timing offset