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Feedback Cancellation Based on Partitioned Time-Domain Pilots for T-DMB Repeaters  

Lee, Ji-Bong (부산대학교 전자전기공학과 통신 및 신호처리 연구실(컴퓨터 및 정보통신 연구소))
Kim, Wan-Jin (부산대학교 전자전기공학과 통신 및 신호처리 연구실(컴퓨터 및 정보통신 연구소))
Park, Sung-Ik (한국전자통신연구원 지상파전송기술연구팀)
Lee, Yong-Tae (한국전자통신연구원 지상파전송기술연구팀)
Kim, Hyoung-Nam (부산대학교 전자전기공학과 통신 및 신호처리 연구실(컴퓨터 및 정보통신 연구소))
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.33, no.3A, 2008 , pp. 327-334 More about this Journal
Abstract
Conventional on-channel-repeaters (OCRs) have a crucial problem that the power of a re-transmitted signal is highly limited by a feedback signal due to antenna coupling. The power limitation problem in OCRs has been solved by incorporating a demodulation-type feedback canceller which eliminates unwanted feedback signals by estimating a feedback channel. In applying the demodulation-type feedback canceller to T-DMB repeaters, there is a troublesome problem of unfrequent known pilot symbols, resulting in poor convergence performance of channel estimation. To solve this problem and enhance the accuracy of estimation, we propose a partitioning method of the Phase Reference Symbol (PRS) transformed in time domain. Since filter coefficients are updated every one partitioned subgroup, the number of updates is increased by the number of partitioned subgroups and thus the convergence speed is enhanced. The improved performance of feedback-channel estimation is directly connected with the feedback-cancellation performance. Simulation result shows that the feedback canceller incorporating the proposed partitioning method has a good performance in terms of residual feedback power.
Keywords
T-DMB; DAB; OCR; Repeater; ICS;
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