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학술지 Performance of Feedback Cancellers for T-DMB On-Channel Repeaters
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저자
이영진, 음호민, 이용태, 손경식, 김형남
발행일
200912
출처
IEEE Transactions on Broadcasting, v.55 no.4, pp.810-817
ISSN
0018-9316
출판사
IEEE
DOI
https://dx.doi.org/10.1109/TBC.2009.2030450
협약과제
09MR6100, 동일주파수망에서의 터널용 T-DMB 재난방송 기술개발, 이용태
초록
This paper presents a feedback canceller (FC) for T-DMB repeaters. Though the conventional FC of T-DMB repeaters has a good feedback cancellation performance, it distorts the recovered signal's out-band spectrum. This spectrum distortion problem is very crucial for commercializing T-DMB repeaters. The feedback canceller with pre-whitening filters (PWFs), which estimates the feedback channel using whitened input signals, can compensate this spectrum problem. However the feedback canceling performance degradation occurs when the feedback channel varies with Doppler effects. To compensate the out-band spectrum distortion and cope with the variation of feedback channel, we propose a novel FC based on the convex combination algorithm. Simulation results show that the proposed FC can remove clearly the out-band spectrum distortion of the recovered signal with improved the feedback canceling performance in both time-invariant and time-varying feedback channels. © 2009 IEEE.
KSP 제안 키워드
Convex combination algorithm, Feedback channel, Pre-whitening, Spectrum distortion, Time-invariant, doppler effect, feedback cancellation, performance degradation, simulation results, time-varying feedback