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Performance Improvement of Terrestrial DTV Receivers Using Frequency-domain Equalization  

Son Sang-Won (부산대학교 전자공학과 통신 및 신호처리 연구실(컴퓨터 및 정보통신 연구소))
Kim Ji-Hyun (부산대학교 전자공학과 통신 및 신호처리 연구실(컴퓨터 및 정보통신 연구소))
Kim Hyoung-Nam (부산대학교 전자공학과 통신 및 신호처리 연구실(컴퓨터 및 정보통신 연구소))
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.31, no.4C, 2006 , pp. 351-363 More about this Journal
Abstract
The 8-VSB modulation, the transmission standard for the terrestrial digital television(DTV) of the Advanced Television Systems Committee(ATSC), suffers from multipath fading because it conveys information on the amplitude. To solve this problem, decision feedback equalizers(DFE's) have been commonly used in terrestrial DTV receivers. However, under severe channels, such as a 0 dB ghost channel or a single frequency network (SFN) channel, the DFE shows unstable convergence due to the error propagation caused by decision errors. Instead of unstable time-domain DFE schemes, by proposing a frequency-domain direct-inversion equalization method, we try to guarantee stable equalization and achieve low symbol error rates. To secure the existence of a channel inverse, channel-matched filtering and noncausal filtering are carried out prior to equalization. Simulation results show that the proposed method performs much better than existing DFE schemes in terms of both the stability and the symbol error rate.
Keywords
DTV; DFE;
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  • Reference
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